Uchiha Kei

Biodata

Feature	Detail
Name	Uchiha Kei 301 508
Alias	War Hero 301; Cold, Poisonous Snake 453; Calamity 337; Minister of the Konoha Guard Division 508
Clan	Uchiha Clan 2 72 124 161 169 301 337 508
Family	Uchiha Keisuke (father) 52 521; Uchiha Ryoko (mother) 53 72; unnamed brother 575
Affiliation	Konoha (Guard Division Minister) 161 301 508
Rank	Jonin (formerly) 2; Department Head (youngest in Konoha Ninja village) 301; Minister of the Guard Division 161 337 508
Current Residence	Small building (same as childhood home) 470
Physical Appearance	Young 508; Medium-length black hair 508; Pale (when adapting to new cells) 287
Kekkei Genkai	Sharingan (awakened after initial missions) 2 124 169; Mangekyo Sharingan 17; Eternal Mangekyo Sharingan 465; Rinnegan 600 649
Known Abilities	Susanoo 337; Genjutsu 337; Fire Style 508; Sage Mode 581; Yin-Yang Release 581; Strategic thinking 2 161 297 337; Manipulative 291; Strong escape capabilities (implied, compared to Obito) 297; Terrifying Sneak Attack capabilities (implied, compared to Obito) 297
Personality	Calm 124 337; Intelligent 337; Precocious 337; Strategic 2 161 297 337; Cautious 82 171 297; Secretive 246; Unyielding towards certain people 337; Approachable 337; Kind 337; Gentle 337; Cold (true nature) 337; Cruel 124; Not broad-minded 477; Frugal 470
Relationships	Hyuga Aya (Teammate/Partner): Intelligent, cunning, schemer; initially wary of Kei but attitude changed after he awakened Sharingan; now a productive partnership with open communication; Kei considers resolving her Caged Bird seal; the two have become emotionally and romantically close 2 124 169 171 246 291 297 337 477 517 575 581 Imai Kenta (Teammate/Partner): Civilian ninja, formidable taijutsu, intelligent; potentially from Senju Clan; initially dangerous to Kei but now a productive partnership; Captain of the Mission Department 2 171 246 287 291 297 337 517 Fukuhisa Kouhei (Guiding Jonin): Loyal to Hokage faction; Kei's second and longest-serving Guiding Jonin; proud of Kei's achievements; Kei acknowledges him but doesn't express warmth due to his loyalty to Hokage 2 83 171 337 First Guiding Jonin: Died heroically covering teammates, contributing to Kei's "Calamity" reputation 2 337 Hatake Kakashi (Friend/Colleague): Kei observes his rapid growth; mutual respect; Kei is aware of Kakashi's behavioral patterns 72 82 444 Might Guy (Acquaintance/Rival): Kei admires his strength but feels envy; energetic and enthusiastic; Kei maintains distance due to Guy's nature 82 83 Uchiha Obito (Acquaintance/Manipulated): Kei wonders if he's pretending to cooperate; Kei believes he can counter Obito in a fight; Kei manipulates Obito to serve Konoha's interests; Obito feels camaraderie with Kei 291 297 342 477 Uchiha Fugaku (Clan Head): Trusts Kei beyond imagination; supports Kei's actions; they work together to control the Uchiha Clan 161 246 337 Uchiha Shisui (Clan Member): Curious about Kei; seeks to understand him better; finds Kei enigmatic 264 337 Orochimaru (Acquaintance): Kei plans to visit him despite past hostility; Kei shows no fear of him; Orochimaru conducts human experiments 246
Notable Achievements	Raided Iwa Ninja rear lines 301; Destroyed Kannabi Bridge 301 470; Became youngest department head in Konoha 301; Defeated Fourth Raikage 470; Participated in Nine-Tails sealing mission 470; Defeated a Mysterious Uchiha 470; Defeated and captured Kirigakure Guard Division Captains Uchiha Tsubasa and Uchiha Tomoya 161; Captured five Kirigakure spies 337; Eliminated five Kirigakure Clan Heads 517; Captured Mei Terumi 517; Awakened a unique red Rinnegan 600
Significant Events	Mission during Kikyo Pass Battle as bait for Minato's squad 2; Encountered serious conflict with Kirigakure Anbu 301; Attended clan meeting, leading to increased attention and pressure 72; Visited Mission Hall to gather information 82 83; Became famous after Kannabi Bridge mission 301 337; Rebuilt Guard Division with Uchiha and Commoner Ninja 161; Arrived in Kirigakure during a purge 297; Body adapted to new cells, improving performance and Chakra 246; Learned Imai Kenta's real surname is likely Senju 246; Submitted Uchiha Obito's report to the Fourth Hokage, revealing Obito's existence 291; Awakened Sage Mode and Yin-Yang Release through the clash of Tenseigan and senjutsu Chakra 581; Awakened the Rinnegan after a ten-day coma 600

Appearance

Uchiha Kei's combat style is consistently described as "concise, swift, and elegant" by those who have witnessed it and survived 370. He moves with effortless grace, likened to a "black butterfly dancing gracefully" amidst battle 491. This elegance is considered the true art of the Uchiha Clan, especially for a qualified member possessing the Sharingan 370 491. His movements are simple and without flashiness, yet they are incredibly effective, a testament to his precise and artful approach to combat 491. Kakashi, after observing Kei, recognized this as the authentic Uchiha combat style, relying on the Sharingan's insight and precise strikes to finish enemies quickly 491. Kei's fighting style is so refined that it is considered an art form, with some Anbu members recalling his ability to easily wipe out an entire sub-division at just thirteen years old 450. Despite his gentle demeanor in daily life, Uchiha Shisui senses a "cold breath" about him, acknowledging that Kei's time on the battlefield has shaped him 337. Enemies often refer to him as a "cold, poisonous snake" due to his ruthless efficiency in combat 453.

Specific details about Uchiha Kei's appearance include:

• Eyes: His pupils are scarlet when using his Sharingan, which can appear "exceptionally terrifying" 491. When using his Eternal Mangekyo Sharingan, he easily defeats opponents 491. He later awakens a red Rinnegan without tomoe, distinct from both the conventional purple Rinnegan and the Rinne Sharingan 600.
• Hair: He has slightly curly short hair 264.
• Build: He has calluses on his hands, indicating his proficiency with sword techniques 264. His Mangekyo Sharingan enhances his physical agility 73.
• Attire: He wears the standard black combat suit of the Uchiha Clan 264.
• Demeanor: In daily life, he is approachable, kind, and gentle 337. However, he can also be tough and unyielding towards certain individuals 337. He is described as calm and extremely intelligent, with a precociousness that allowed him to understand missions and intelligence uniquely on the battlefield 337.
• Combat Habits: He prefers to avoid injury, stating that a fighting style "always leaving oneself covered in wounds is truly crude to the extreme" 370. He recovers quickly from injuries, fully healing in just over ten seconds without a scar, though he considers this a mere experiment and would never allow himself to be easily injured in battle 370. He exploits weaknesses, uses Genjutsu to weaken defenses, and finishes battles swiftly with techniques like Chidori 450. His speed is such that he can keep up with and defeat opponents like the Fourth Raikage 450. He is capable of using various abilities and suppressing his opponents accordingly 442.
• Sage Mark: His Sage Mode has no conspicuous external transformation; instead, its mark is concealed on his chest beneath his clothing, while its activation produces a scorching sensation throughout his body 581.

Personality and Traits

Uchiha Kei's personality is multifaceted, often presenting a stark contrast between his public demeanor and his true nature, particularly in the eyes of his enemies. He is consistently described as calm and intelligent, traits that are almost universally recognized by those who interact with him 337. Fukuhisa Kouhei, his former guiding Jonin, noted that Kei was "calm and extremely intelligent" and possessed an "exceptionally precocious" understanding of missions and intelligence, even at a young age 337. This precociousness was not about social matters but rather his strategic insight on the battlefield, where he would subtly guide outcomes without overtly stating his concerns 337.

Within Konoha, Kei maintains a persona of politeness, respect, and adherence to principles 337. He is perceived as approachable, kind, and gentle in daily life 337. This facade is so convincing that even Uchiha Shisui, a perceptive ninja, initially struggles to reconcile this image with the "cold Breath" he senses from Kei, knowing he has spent considerable time on the battlefield 337. Kei himself acknowledges that being a "good person" is a useful persona for navigating his position and achieving his goals, though he disdains to genuinely consider himself one, having experienced and participated in war 477. He has learned to project kindness, even smiling more often, as his status within the clan and village has grown 384.

However, this public image belies a deeply strategic, manipulative, and ruthless core, especially when dealing with enemies or obstacles to his objectives. Enemies consistently describe him with terms like "cold," "cunning," "shameless," and "unscrupulous," with "cold, poisonous snake" being a frequent epithet 453 384. Hyuga Aya, who knows him well, notes that his aura can be "just like a terrifying Poisonous Snake," finding it hard to believe that the "gentle Kei could be such a dark person" 384. Kei takes these negative evaluations from his enemies as a testament to his effectiveness, believing that "the more vicious the evaluation an enemy has for you, the stronger your ability is" 384.

Kei's strategic thinking is evident in his political acumen. He surprises his clan with his mature demeanor and ability to argue against short-sighted actions, such as reclaiming Kakashi's Sharingan, by predicting the negative impact on the clan's reputation 70. He is capable of orchestrating complex plans, such as manipulating Uchiha Obito to serve Konoha's interests while also dismantling Uchiha Madara's plans 291. His actions, such as attacking and defeating Uchiha Tsubasa and Uchiha Tomoya to rebuild his squad, demonstrate his formidable strength and strategic mind, earning him both respect and fear within the Uchiha clan 161. Uchiha Fugaku, the clan head, trusts Kei's judgment and abilities implicitly, recognizing his intelligence and potential 70 337.

Despite his ruthlessness, Kei is not entirely devoid of humanity. Fukuhisa Kouhei observes that Kei "always harbored kindness in his heart" and would feel a sense of unease when killing enemies, a discomfort stemming from the concepts of good and evil from his previous life 337. While he learned to suppress these benevolent thoughts to appear cold-blooded on the battlefield, the internal struggle was genuine 337. He differentiates himself from figures like Danzo by stating, "I still harbor kindness and possess humanity, rather than being someone who has completely extinguished it" 337. This internal conflict suggests a complex moral compass, where kindness exists but is often overridden by pragmatic necessity, especially in the context of war 337.

Kei's intelligence extends to his combat style, which Kakashi recognizes as the "true art of the Uchiha Clan," relying on the Sharingan's insight and precise strikes 491. He enjoys battle and demonstrates immense skill, adapting his fighting style and exploiting weaknesses 491 450. His combat is characterized by precision, strategy, and adaptability, contrasting with brute-force approaches 450. He is also highly cautious, as seen when he uses a Shadow Clone to scout Uchiha Yuu's patrol route, unwilling to risk his plans being discovered 89.

He is also a deeply private individual, often keeping his true thoughts and intentions to himself. Fukuhisa Kouhei notes that Kei "always seemed to have too many concerns in his heart; he would never say these things outright, but rather drop a hint or two" 337. This secretive nature contributes to his enigmatic aura, making it difficult for others, even those close to him, to fully understand him 337. Uchiha Shisui, for instance, is driven by an "infinite curiosity" to understand the "enigmatic person" that is Uchiha Kei 337.

Kei's emotional stability is a notable trait. After intense experiences, such as nearly being killed, his emotions remain "relatively stable" and "calm" 150. He even ponders whether a "calm Uchiha is not a good Uchiha," drawing parallels to Uchiha Madara's stable emotions in his later years 150. This emotional control allows him to maintain composure even in high-pressure situations, contributing to his strategic effectiveness.

Finally, Kei is a leader who inspires loyalty and respect, even from those who initially misunderstand him. Uchiha Kawa and Fukuhisa Kouta express loyalty and willingness to follow his orders 161. Fukuhisa Kouhei, despite his initial impressions, becomes proud to have been Kei's guiding Jonin, recognizing his student's exceptional qualities 337. Even Kakashi, who views Kei as a mentor figure, deeply respects him and feels guided by him "from darkness toward the light" 454. However, Kei is also aware of the impact of his hero status, which can make it difficult for him to gather information or interact normally with others 83. He struggles with the attention he receives, finding it "unbearable to be treated like a monkey on display" 72.

His increasing trust in Aya and Kenta represents a significant exception to his guarded nature. He eventually decides to reveal a terrifying truth concerning the world to them after awakening his Rinnegan, relying on their longstanding companionship as he prepares for future threats 600.

Background

Uchiha Kei's early life was shaped by his family, particularly his father, Uchiha Keisuke, a former Chunin whose ninja career ended due to injuries sustained during the Second Great Ninja War. Keisuke, a quiet and reserved man, laid the foundation for Kei's ninja training and supported the family through clan resources and business ventures 52. Kei also received an ordinary kunai from Keisuke as his first proper gift before being sent to the battlefield at age seven 575.

Kei's reputation as a "Calamity" began early in his ninja career. His first guiding Jonin died on a mission while saving a subordinate, an event that quickly became known throughout Konoha. This incident marked the beginning of a pattern: subsequent Jonin who served as his squad leaders or guiding Jonin almost invariably died on the battlefield, with only Kei surviving. This led to the widespread belief that those associated with him were doomed, solidifying his ominous reputation 337. Despite this, Fukuhisa Kouhei, one of Kei's guiding Jonin, remembered him as calm, extremely intelligent, and exceptionally precocious on the battlefield, possessing a unique understanding of missions and intelligence 337.

Kei's progression through the ninja ranks was rapid and impactful. He quickly gained recognition for his skills, including his ability to use terrifying Ninjutsu at a young age 327. His name became widely known after he successfully completed the impossible mission of raiding the Iwa Ninja rear lines and destroying the Kannabi Bridge, a feat that spread his fame across major ninja villages 301. He later assisted Namikaze Minato in negotiations with Iwagakure 219.

His influence within Konoha grew significantly. He reorganized his detachment within the Guard Division, making it distinct from other units, and within months, leveraged political alliances to become the second most powerful figure in the Uchiha Clan, controlling at least half of the Guard Division 219. He became the youngest department head in Konoha, deeply trusted by the Hokage 301. His relationship with Namikaze Minato was strong, with Minato acknowledging Kei's role in Kakashi's development and his positive relationships with other young ninjas in the village 120. Kei's actions on the front lines, including rescuing captives, earned him immense respect from other ninjas 120.

Within the Uchiha clan, Kei's rise was equally dramatic. He and Uchiha Fugaku, the clan head, worked together to firmly control the clan, improving its standing 337. Kei's influence grew to be on par with Fugaku's, even allowing him to preside over clan meetings 372. He was instrumental in bringing the Uchiha back into alignment with Konoha, almost single-handedly confronting and eliminating extremist leaders within the clan who advocated for a hardline stance against the village 376. This decisive action, though heavy-handed, was seen by many, including Uchiha Itachi, as justified due to Kei's strength and ability 376.

Kei's combat style was unique and highly effective. He was noted for his precise strikes and the ability to finish enemies quickly 491. Kakashi, who trained with Kei and received guidance from him, recognized Kei's approach as the "true art of the Uchiha Clan," relying on the Sharingan's insight, swordsmanship, and derivatives of the Chidori 491. Kei's emotions, particularly after intense experiences like nearly being killed by Namikaze Minato or Kitsuchi, became remarkably stable, leading him to ponder if intense emotions were key to accelerating Susanoo's evolution 150.

Despite his power and influence, Kei maintained a complex public persona. In daily life, he was approachable, kind, and gentle 337. However, those who knew him well, like Uchiha Shisui, sensed a coldness beneath the surface, a reflection of his many years on the battlefield 337. He was also known for his ruthlessness towards enemies and his willingness to take drastic action, even against his own clansmen, as seen in the elimination of Uchiha Shin and other elders who opposed him 327 376. This contradictory nature left many, including Shisui, struggling to fully understand him 337.

Kei's presence significantly impacted the younger generation of Uchiha. Young children were encouraged to emulate him, much to his discomfort 72. Uchiha Itachi, after witnessing a battle between Fugaku and Kei, was profoundly affected by Kei's power and past actions. Itachi decided to leave the Ninja Academy to pursue Kei's path, aiming to gain his approval, despite some lingering resentment for Kei's harsh methods 376 520. Similarly, Uchiha Shisui, deeply respecting Kei, aspired to become a key leader like him and guide the Uchiha to a better future 337. Even Uchiha Sasuke grew up hearing stories of Kei's immense power, often considering him second only to his father, the Hokage 520.

Kei's influence extended beyond the Uchiha. He trained with Kakashi, helping him overcome struggles with his Sharingan and guiding him to find his own combat path 65 491. He also invested energy in Hyuga Aya and Imai Kenta, even assisting with Kenta's fusion experiments 362. Despite his growing power, Kei remained cautious, avoiding contact with controversial figures like Orochimaru 65. He also recognized the political landscape of Konoha, understanding that the Uchiha were still viewed as outsiders by some elites, and that his rapid rise as head of the Guard Division, without direct ties to the Hokage's lineage, was met with measured goodwill 363.

Kei's later pursuit of power expanded beyond the conventional limits of the Uchiha. Following the evolution of his Mangekyo into the Eternal Mangekyo Sharingan, he continued researching his time-based Dojutsu, experimented with Tailed Beast Chakra, and ultimately awakened Sage Mode, Yin-Yang Release, and a unique red Rinnegan 465 581 600. These developments placed him in direct opposition to increasingly dangerous forces, including Ōtsutsuki Isshiki, whose abilities Kei analyzed with the Rinnegan to identify exploitable limitations 677.

Power Progression

Mangekyo Sharingan Awakening

Uchiha Kei awakened his Mangekyo Sharingan at an unusually early age, a fact that surprised even Black Zetsu, who possessed millennia of experience 500. His awakening occurred during a life-threatening confrontation, driven by a desperate desire to survive and by wishes for greater speed, slower enemies, and stopped time 17. The early awakening led to questions regarding the potential for excessive consumption of Dojutsu Power 500. Kei's Mangekyo Sharingan grants him three distinct abilities, though he initially did not make extensive use of them 363. He understands that the activation of the Sharingan generates a specific type of Yin Release, which is critical to its power 149. He has also observed that the activity level of his Mangekyo Sharingan can vary, sometimes surprising him with its intensity 336.

• Time Leap: The ability of Kei's left eye, allowing him to accelerate his own time or that of a target 17. It can produce sudden, unnatural bursts of speed without physical damage, confusing even Black Zetsu 298.
• Time Rewind: The ability of Kei's right eye, allowing him to slow his own time or that of a target 17. Kei used it against Kitsuchi and later developed it into a restorative ability capable of recovering Chakra and reversing injuries, though the cost in Dojutsu Power remains severe 28 363 474.
• Time Stop: A combined ability of both eyes that can pause time 17. Kei regards it as his most lethal and strongest Dojutsu technique, though its effect depends on his capacity to suppress the target through Chakra and Dojutsu Power 90 363.
• Combined Temporal Decay: By combining all three temporal abilities, Kei created an attack that accelerates decay. The technique is extraordinarily powerful but consumes a substantial amount of Dojutsu Power 363.

Susanoo Development

Kei's Susanoo has shown continuous and rapid development, becoming stronger and more terrifying over time 500. He understands that Susanoo is a guardian deity residing within the psyche and soul of the Uchiha, and its power is accessed by reaching out, perceiving, and acknowledging it 442. The closer the connection between an individual and their Susanoo, the greater the power they can attain 442.

• Initial Stages: Kei's Susanoo reached the threshold of the third stage relatively early in his development 336. In these initial stages, the consumption of Dojutsu Power was significant, though it became less terrifying with training 363.
• Independent Activation: Kei mastered activating Susanoo without relying on Dojutsu Power, significantly reducing its burden and improving his ability to use it continuously 178.
• Fourth Stage: The Fourth Stage Susanoo is described as fundamentally different from the first and third stages 442. It requires the user to reconstruct and perceive its power, serving as a prelude to unlocking the "complete Susanoo within your heart" 442. Kei anticipates that his Susanoo will inevitably reach the fourth stage 336.
• Complete Body Susanoo: Kei has unlocked the ultimate forbidden power of the Uchiha Clan: the Complete Body Susanoo 500. Black Zetsu found this achievement particularly unbelievable, questioning how a Mangekyo could unlock such power, especially given Kei's age and the relatively short time since he obtained his Mangekyo Sharingan 500. Black Zetsu speculated that Kei's eyes might possess an ability to amplify Susanoo, but still doubted he could reach the extreme level of understanding demonstrated by Uchiha Madara, particularly as Kei is not an incarnation of Indra 500.
  • Manifestation: When activated, pitch-black Chakra solidifies around Kei, lifting him into the air as the massive Susanoo fully forms 363. He stands silently within it, and his Mangekyo Sharingan rotates slowly, diffusing Dojutsu Power in conjunction with the Susanoo's movements 363.
  • Capabilities: Kei aims for his Susanoo to possess combat equipment and the flight capabilities of a Perfect Form, acknowledging the "divine" display of power seen in Madara's Susanoo at that stage 336.
  • Tailed Beast Chakra Integration: Kei attempted to upgrade his Susanoo by fusing it with Chakra from an Eight-Tails tentacle. The resulting Chakra overflow contributed to the evolution of his Mangekyo Sharingan into the Eternal Mangekyo Sharingan 465.

Eternal Mangekyo Sharingan

Kei's Mangekyo evolved into the Eternal Mangekyo Sharingan during his attempt to integrate Eight-Tails Chakra with Susanoo 465. The evolution occurred despite the unusual nature of his eyes and without the conventional acquisition of a sibling's Mangekyo eyes 298 465.

The Eternal Mangekyo significantly improved the stability and scale of Kei's Dojutsu and Susanoo, while enabling more extensive experimentation with his temporal powers 465 474. He became capable of repeatedly restoring his state with Time Rewind, though each use still imposed tremendous strain and temporarily curtailed further Dojutsu use 474.

Sage Mode and Yin-Yang Release

Kei accidentally awakened Sage Mode and Yin-Yang Release when Tenseigan Chakra and senjutsu Chakra clashed inside his body 581. Unlike Hyuga Aya's visibly transformative Sage Mode, Kei's form does not produce obvious external changes, instead generating intense heat across his body and a concealed Sage Mark on his chest 581.

Although initially accidental, Kei learned to accept and control this unusual Sage Mode. Its emergence gave him another avenue for increasing his combat power and integrating the varied energies already present within his body 581.

Rinnegan

After being unconscious for ten days, Kei awakened the Rinnegan 600. His Rinnegan is red rather than purple and lacks tomoe, distinguishing it from the Rinne Sharingan 600. He can activate it at will and rejects the need to depend on another person's eyes for this power 649.

The Rinnegan substantially reduces the burden of Kei's previously overwhelming temporal abilities, which Ōtsutsuki Hamura describes as powers too advanced for Kei's earlier capacity to wield 602. It also grants him access to the Rinnegan's standard abilities, including gravitational techniques, Chakra absorption, and the capacity to inspect memories within souls 602. Kei has used the Rinnegan to analyze Ōtsutsuki Isshiki's abilities and discover limitations within the latter's otherwise unimaginable power 677.

Abilities and Techniques

Dojutsu

The Sharingan is central to Uchiha Kei's combat style, providing him with enhanced insight and the ability to anticipate and counter enemy movements 36 491. He utilizes it to predict and react to attacks, making quick evasive maneuvers and precision strikes 36. The Sharingan also allows him to employ powerful genjutsu, which he uses strategically to weaken opponents' defenses and create openings for attack 40 450. His combat approach is described as bringing the Sharingan's power to its absolute limit 491.

• Genjutsu: Sharingan A genjutsu technique used to create illusions and manipulate an opponent's senses. Uchiha Kei employed this against Hunter, an Iwa Ninja with an explosion-based Kekkei Genkai, to gain an advantage 40. He also used genjutsu to weaken the Fourth Raikage's defenses during a battle 450.
• Mangekyo Sharingan: Time Leap Kei's left-eye ability accelerates the time of himself or a target, allowing extraordinary acceleration and rapid changes in combat tempo 17.
• Mangekyo Sharingan: Time Rewind Kei's right-eye ability slows the time of himself or a target 17. He can also use it to reverse his own condition, restoring Chakra and healing injuries at the cost of considerable Dojutsu Power 363 474.
• Mangekyo Sharingan: Time Stop A combined technique of Kei's eyes capable of pausing time 17. Kei considers it his most decisive temporal technique 363.
• Eternal Mangekyo Sharingan A more advanced form of the Sharingan, which Uchiha Kei possesses. He used it to easily defeat a Yamanaka Clan ninja 491. Its awakening followed his Susanoo's fusion attempt with Eight-Tails Chakra 465.
• Rinnegan A unique red, tomoe-less Rinnegan awakened by Kei 600. It grants him access to the Rinnegan's basic abilities and reduces the burden associated with his temporal Dojutsu 602.

Ninjutsu

Uchiha Kei is proficient in various ninjutsu, often adapting them to his unique combat style. He can learn and refine different Chakra natures beyond his innate ones 53. His ninjutsu use is often combined with his Sharingan's insight and taijutsu for maximum effectiveness 491.

• Chidori A Lightning Release ninjutsu that combines Chakra nature transformation and shape transformation. Uchiha Kei has mastered this technique and uses it as a foundational ability, similar to how Sasuke Uchiha developed various derivatives from it 53 491. He has used Chidori to inflict severe injuries, such as tearing open a wound on the Fourth Raikage 450.
  • Chidori Stream 53
  • Chidori Blade 53
  • Chidori Sharp Spear 53
  • Chidori Senbon 53
• Fire Style: Great Fireball Technique A basic but powerful Fire Release ninjutsu. Uchiha Kei used this to initiate an attack against a group of eight Iwa Ninja 36.
• Fire Style: Great Dragon Fire Technique A high-level Fire Release technique Kei used to destroy the elders' bamboo-forest house and force them into retreat 201.
• Lightning Release Chakra Uchiha Kei can infuse his ninja sword with Lightning Release chakra to incapacitate opponents, as demonstrated when he stabbed a female Mist Shinobi 132.
• Substitution Jutsu A basic ninjutsu that allows the user to quickly switch places with another object to avoid an attack. Uchiha Kei used this technique to evade Hunter's attacks 40.
• Smoke Clone Trick A deceptive technique used to escape from restraints. Uchiha Kei employed this to break free from a Water Prison Technique 132.

Taijutsu

Uchiha Kei's taijutsu is highly effective, especially when combined with his Sharingan. He often uses taijutsu as a Chakra-conserving combat method, relying on his visual prowess to predict and counter movements 36. His taijutsu is characterized by precision and speed, aiming to finish enemies quickly 491.

• Body Flicker Technique (Shunshin no Jutsu) A high-speed movement technique. Uchiha Kei uses this to swiftly eliminate multiple enemies and make quick evasive maneuvers 36. Rapid use of this technique can be taxing on his Chakra 36.
• Sage Mode Kei's Sage Mode arose from the interaction of Tenseigan and senjutsu Chakra and has no obvious visible transformation beyond a chest mark 581.

Kenjutsu (Swordsmanship)

Uchiha Kei is a skilled swordsman, incorporating his ninja sword into his combat style. His swordsmanship is precise and deadly, capable of delivering fatal blows with unusual arcs 36. He has also copied and modified sword techniques from others 132.

• Ninja Sword Uchiha Kei wields a ninja sword, using it for precision strikes and to incapacitate opponents, sometimes by infusing it with Lightning Release chakra 36 132.
• Qieyu A ninja sword Kei uses during high-risk operations but conceals when its identification could expose his identity 426 508.

Other Skills

Uchiha Kei's overall combat style is described as an "art" that emphasizes precision, strategy, and adaptability 450 491. He is known for his strategic thinking, understanding enemy situations, and adjusting his tactics accordingly 36. He can exploit weaknesses and force opponents into defensive positions, often ending battles swiftly 450. He also possesses a mysterious ability hinted at by the manifestation of a "pitch-black skeleton" 172. His combat habits involve bringing out various abilities to counter and suppress his opponents' techniques 442.

• Susanoo: Kei can manifest Susanoo in multiple stages, including a Complete Body form. He can activate it independently of Dojutsu Power and has sought to enhance it through Tailed Beast Chakra 178 465 500.
• Yin-Yang Release: Kei accidentally activated Yin-Yang Release alongside Sage Mode after the collision of Tenseigan and senjutsu Chakra within his body 581.
• Rinnegan Chakra Mode: By later stages, Kei trained this mode to an exceptionally proficient level 721.

Relationships

Uchiha Fugaku

Uchiha Kei and Uchiha Fugaku share a complex and evolving relationship, transitioning from a power dynamic within the Uchiha clan to a partnership, and eventually, a friendship 71 156 337 442. Initially, Fugaku, as the clan head, reprimands Kei for being late to a clan meeting, setting a tone of authority 67. However, Fugaku quickly recognizes Kei's strategic thinking and ambition, especially after Kei successfully makes an impression at the clan meeting by challenging established views 71. Fugaku shows support for Kei's actions, even when they are controversial, such as Kei's forceful takeover of the Guard Division, indicating a growing trust in Kei's abilities and potential 161.

Their relationship deepens as they collaborate on clan matters. Fugaku's trust in Kei is described as exceeding imagination, and together they firmly control the Uchiha Clan, leading to its improvement 337. Kei views Fugaku as a necessary partner, not only for managing the clan but also for their cooperation with Namikaze Minato 442. While Kei often takes the lead in their joint endeavors, Fugaku strives to maintain a deterrent force to prevent Kei from acting recklessly, demonstrating his desire to remain an active and influential figure rather than becoming passive 442. Despite their differing methods—Kei's ruthlessness versus Fugaku's preference for less extreme measures—they share identical thoughts regarding their attitude towards enemies 156 442. Kei categorizes Fugaku as a friend, indicating a level of closeness and willingness to provide guidance, even if not fully disclosing all his plans 442. This partnership culminates in an alliance between the Uchiha and Senju clans, further solidifying their joint influence 348.

Their later discussions continue to concern the future of the Uchiha and the younger generation. Fugaku remains concerned about the effects of Kei's plans on his children and asks Kei directly about his intentions, while Kei maintains an agreement with the Third Hokage regarding Shisui's concealed circumstances 587.

Imai Kenta

Imai Kenta is a civilian ninja and one of Uchiha Kei's long-standing teammates, having served together through numerous missions 2. Their relationship is characterized by a strong sense of loyalty and trust, with Kenta willing to follow Kei's lead 267. Kei, in turn, is willing to help Kenta and the Senju Clan, demonstrating a mutual reliance 267. Kenta is described as intelligent and skilled in taijutsu, having survived the war due to his cunning 2.

Kei recognizes Kenta's potential as an ally, especially due to Kenta's suspected dissatisfaction with the Konoha High-level and his battlefield performance 173. Kei actively recruits Kenta to be the vice-captain of his reformed Guard Division squad, a position Kenta initially accepts with reluctance but eventually embraces, understanding the benefits of their partnership 174. Kei shares his long-term ambitions with Kenta, hinting at his plans to integrate the power of various clans 174. Their bond is further solidified when Kei and Kenta conspire to make Senju Shozuma's death appear as a suicide, and Kei works with Namikaze Minato to secure Kenta a position in the Mission Department to help revitalize the Senju Clan 267. Kei considers Kenta, along with Hyuga Aya, as one of the few people who truly resemble him in their cunning and survival instincts 72.

Their cooperation also extends to increasingly dangerous research. Kei used his Dojutsu to accelerate Kenta's fusion process, producing substantial gains but severe side effects 365. Kenta later assists Kei in obtaining materials for a Time Seal experiment and remains one of the two companions in whom Kei chooses to confide following his Rinnegan awakening 600 649.

Hyuga Aya

Hyuga Aya, a member of the Hyuga clan's branch family, is another long-term teammate of Uchiha Kei 2. Their relationship is professional but marked by a mutual understanding of each other's cunning and hidden intentions 2. Both are described as "old foxes" who have survived the war due to their intelligence and adaptability 2. Their rapport and understanding deepen over time 337.

Aya is portrayed as intelligent and manipulative, actively seeking to improve her position 173. She approaches Kei to form an alliance, demonstrating her strategic mind 173. She even asks her fiancé, Hyuga Teru, for Medical Ninjutsu books to strengthen her cooperation with Kei, maintaining a facade of sincerity while pursuing her goals 173. Kei acknowledges Aya's pursuit as "purer" than his and Kenta's, suggesting a recognition of her ambition 173. Despite their shared cunning, Kei blames Aya for an ambush during a mission, indicating a dynamic where he holds her accountable for strategic missteps 110. Kei considers Aya, alongside Imai Kenta, as one of the few people who truly resemble him in their survival instincts 72.

Their partnership evolves into deep emotional intimacy. Kei feels unusually at ease with Aya, while Aya entrusts him with memories of her childhood, her first kill, and her resolve to break free of her fate 575. They share mutual affection, though their relationship retains tension born from the burdens each carries 575. Aya also remains a key collaborator in Kei's experiments and was present when his Sage Mode unexpectedly emerged 581.

Kakashi Hatake

Uchiha Kei and Kakashi Hatake share a relationship built on mutual respect, training, and a deep understanding of combat 72 267 491. Kei trains with Kakashi, offering advice on his combat style and mindset, hinting at Kakashi's future path 72. Kakashi, in turn, provides Kei with intelligence, demonstrating a trusting and friendly dynamic 267.

Kakashi views Kei as a mentor figure who guided him away from a wrong path and towards the light, placing Kei on a pedestal similar to his teacher, Minato 454. He deeply reveres Kei and considers him a close friend, though he struggles to see himself on the same level as Kei 454. Kakashi observes Kei's combat style, realizing it represents the true art of the Uchiha Clan, relying on the Sharingan's insight and precise strikes 491. This observation leads Kakashi to reflect on his own growth under Kei's guidance 491. Their discussions also include modifying Chidori Ninjutsu, showcasing their collaborative approach to skill development 67.

Kakashi later experiences a premature Mangekyo-related state while fighting Hozuki Mangetsu and seeks Kei's guidance in controlling it, further emphasizing Kei's role as both mentor and trusted comrade 514.

Fukuhisa Kouhei

Fukuhisa Kouhei was Uchiha Kei's second and longest-serving Guiding Jonin, and the only one to survive his tenure 337. Their relationship began with Kouhei observing Kei as calm, intelligent, and exceptionally precocious on the battlefield 337. Kouhei noted Kei's unique understanding of missions and intelligence, and his tendency to subtly guide outcomes without direct confrontation 337.

Kouhei holds a favorable impression of Kei, and his survival as Kei's squad leader is a notable exception, as Kei's previous Jonin died in action, earning Kei a reputation as a "Calamity" 337. Kouhei's leadership and strategic thinking were evident during missions, such as when he used Earth Style jutsu to create an escape route for the team 110. Later, Kouhei reminisces about his time as Kei's Guiding Jonin, sharing insights about Kei with Uchiha Shisui, which further shapes Shisui's understanding of Kei 337. Despite their past, Kei acknowledges Kouhei but does not express warmth, possibly due to Kouhei's loyalty to the Hokage 83.

Uchiha Shisui

Uchiha Shisui's relationship with Uchiha Kei is characterized by curiosity, respect, and a desire to understand Kei's complex character 337. Shisui becomes increasingly curious and determined to understand Kei better, especially after learning about Kei's past from Fukuhisa Kouhei 337. He struggles to reconcile Kei's contradictory manifestations of kindness and ruthlessness, particularly Kei's actions within the Uchiha Clan 337.

Shisui deeply identifies with and respects Kei, viewing him as a key leader who could guide the Uchiha Clan towards a better future 337. He makes a bold decision to meet Kei directly to understand certain things, even while under the influence of techniques 337. Shisui hopes to emulate Kei's success and leadership within the clan 337.

Kei later reveals his Potential Plan and Infiltration Plan to Shisui, who accepts them after confronting the consequences of actions he took under Kei's genjutsu 629. Kei considers Shisui's Mangekyo and position within Akatsuki potentially useful to their wider plans 629.

Namikaze Minato

Uchiha Kei and Namikaze Minato share a strong working relationship built on trust and mutual support 267. Minato, as the Hokage, shows understanding and support for Kei's plans, demonstrating his trust in Kei and his willingness to collaborate 267. This trust is evident when Kei reveals his second state of Susanoo to Minato, explaining it as a secret Uchiha technique, and Minato accepts this explanation 267.

They discuss significant matters, such as the Senju Clan's situation, leading to a decision to give Imai Kenta a position to help revitalize the clan 267. They also discuss the Anbu situation, with Kei agreeing to send four Uchiha members to join 267. Minato shows concern for his unborn child, asking Kei to use gentler approaches in the future, indicating a personal dimension to their professional relationship 267.

Minato continues to regard Kei as a close friend who has accompanied him from Jonin to Hokage. Although he recognizes that Kei's methods often differ sharply from his own, Minato trusts that Kei acts from love for Konoha and will explain his actions when circumstances permit 593.

Impact and Legacy

Uchiha Kei's impact on the Uchiha clan, Konoha, and its political landscape was profound and multifaceted, characterized by his strategic acumen, political maneuvering, and long-term vision. His actions reshaped the Uchiha's standing within the village, influenced key leadership decisions, and established a unique legacy that intertwined ruthlessness with a pragmatic pursuit of stability and power 441.

Within the Uchiha clan, Kei's influence grew to rival, and in some aspects, even surpass that of the clan head, Uchiha Fugaku 372. He was instrumental in proposing and implementing policies aimed at bridging the growing chasm between Konoha and the Uchiha, a rift that many believed would have otherwise led the clan to ruin 441. While initially perceived by some as merely an agent for Fugaku, Kei quietly executed these changes, demonstrating a level of courage and decisiveness that Uchiha Zhen believed Fugaku lacked 441. Fugaku, despite his formidable strength, was often caught between loyalty to the clan and loyalty to the village, seeking to balance internal affairs with external relations rather than making the "bloody move" Kei was capable of 441. Kei's approach, though sometimes viewed as bloodthirsty and cold by some clan members like Uchiha Shin, who felt he never truly prioritized the clan, was also admired for its effectiveness in preventing the Uchiha's downfall 441. This complex perception of Kei, as both ruthless and admirable, was shared by others like Uchiha Shisui, who found himself deeply shaken by Kei's ability to achieve Shisui's own dream of integrating the Uchiha into Konoha without conflict 441.

Kei's methods for consolidating power within the clan were decisive. He systematically eliminated extremist elders, ensuring that those who remained, even if they disagreed with him, would not openly oppose him 372. This allowed him and Fugaku to firmly control the Uchiha, leading to a period of improved standing for the clan 337. Their cooperation was a unique tacit understanding: Fugaku managed internal clan issues, while Kei handled external matters. This internal-external coordination was seen as crucial for the Uchiha's future prosperity 376. Fugaku trusted Kei implicitly, and Kei consistently delivered results, accumulating significant political capital for the clan head 337 441. This partnership evolved into a strong bond, with Kei considering Fugaku not just a partner but a friend, willing to offer guidance and support 442. Fugaku, in turn, repositioned himself to act as a check on Kei, hoping to prevent him from acting recklessly, even while acknowledging Kei often led their initiatives 442.

Beyond the clan, Kei's strategic contributions significantly impacted Konoha's political landscape. He possessed "incredible influence" with the Fourth Hokage, Namikaze Minato, an influence he wielded cautiously due to its potential to alter the fate of individuals and entire clans 264. Kei was one of the key figures who propelled Minato into the Hokage position 366. His closeness to Minato, who considered Kei almost like family, further solidified his political standing 366. Kei's support for Minato was not merely personal; he publicly represented the Uchiha clan in supporting Minato's resolution to strip ninja clans of vested interests and empower Commoner Ninja, a move that was a "monumental blessing" for Konoha and its common citizens 441. This act, while potentially detrimental to the Uchiha's immediate clan interests, garnered immense goodwill for the clan and cleansed their reputation, a process Kei had been laying the groundwork for years 441.

Kei's strategic thinking extended to foreign policy and internal security. He assisted Minato in negotiations with Iwagakure and reorganized his detachment within the Guard Division, making it distinct and powerful 219. He rapidly ascended to become the second most powerful figure in the Uchiha, controlling at least half of the Guard Division 219. His administrative capabilities and logical approach were highly valued 366. Kei's willingness to make difficult decisions, even those considered "dark" by others like Kakashi, was always aligned with Konoha's interests, particularly in supporting the Hokage's authority over the Daimyo 349. His philosophy of "eliminating all threats directly without leaving any future trouble" was a hallmark of his approach 350.

Kei's long-term goals were centered on ensuring the Uchiha's integration and prosperity within Konoha, while also securing his own influence and power. He believed that gaining influence didn't necessarily mean holding the supreme leadership but could be achieved through strategic behind-the-scenes operations, a safer and potentially more effective approach for a clan 102. He actively worked to change the Uchiha's political status, which he perceived as lower than even the recently revived Senju clan 363. His actions, such as supporting Minato's resolution, were designed to integrate the Uchiha into Konoha, ending their isolation and helplessness, a goal that deeply resonated with Uchiha Shisui 441.

Kei's legacy is also marked by his personal impact on those around him. He was seen as calm, intelligent, and exceptionally precocious, especially on the battlefield, where he demonstrated a unique understanding of missions and intelligence, often subtly guiding outcomes to avoid negative consequences 337. His ability to be polite and principled while dealing ruthlessly with enemies earned him respect, with his former Guiding Jonin, Fukuhisa Kouhei, expressing immense pride in having mentored him 337. Kei's philosophical statements, such as "living is harder than dying" and "a powerful ninja isn't defined by strength, but by their ability to carry the will of fallen companions and keep moving forward," became widely adopted mottos among Konoha ninja, further increasing his influence 352. Even Uchiha Itachi, despite some lingering resentment over Kei's past heavy-handedness, admired his dedication to both the Uchiha and Konoha and sought to emulate him, aiming to gain his approval 376. Kei's rapid rise, his deep trust from the Hokage, and his decisive actions, including the controversial killing of clan elders, left a lasting impression of a powerful, ambitious, and often ruthless figure who would stop at nothing to achieve his objectives 327 301.

His continued growth has expanded the scope of his influence beyond Konoha's internal politics. By awakening a distinctive Rinnegan, studying the Ōtsutsuki, and preparing against threats such as Isshiki, Kei has become a central figure in preparations for dangers that extend beyond the conventional ninja world 600 677.

Battles

Opponent(s)	Key Techniques Used	Outcome	Significance
Iwa Ninja (multiple squads)	Sharingan, Body Flicker Technique, Fire Style (Great Fireball Technique), Taijutsu	Uchiha Kei swiftly eliminated at least 12 low to mid-level Iwa Ninja.	Demonstrated Uchiha Kei's exceptional skill and precision in sneak attacks, strategic thinking, and ability to conserve Chakra 36.
Kitsuchi of Both Scales and Iwa Ninja	Sharingan, Body Flicker Technique, Shadow Clone, Taijutsu, Time Rewind, strategic planning	Uchiha Kei killed one Iwa Ninja, defeated Kitsuchi and the final Iwa Ninja, and ensured the mission's success.	Showcased Uchiha Kei's strategic thinking, adaptability, and the first combat use of Time Rewind against a formidable opponent like Kitsuchi 24 25 26 27 28.
Ishi-mizu-shu Squad (four Iwa Ninja)	Mangekyo Sharingan (Time Leap), enhanced physical prowess	Uchiha Kei, though initially injured and exhausted, used his Mangekyo Sharingan to dispatch three Iwa Ninja quickly and overpower the last one.	Illustrated the power of teamwork and strategy against individual strength, the high cost of using powerful abilities like the Mangekyo Sharingan, and Uchiha Kei's adaptability in battle 47.
Root Ninjas (including a Yamanaka Clan member)	Eternal Mangekyo Sharingan, Fire Style, Chidori, swordsmanship	Uchiha Kei easily defeated the Yamanaka ninja and then enjoyed defeating the remaining Root ninjas, showcasing his unique combat style.	Demonstrated Uchiha Kei's immense strength, skill, and enjoyment of battle. Kakashi observed this battle, realizing it represented the true art of the Uchiha Clan's combat style 491.
Fourth Raikage	Genjutsu, Chidori, Chakra Giant (Susanoo), exploitation of weaknesses	Uchiha Kei severely injured the Fourth Raikage twice, tearing open a chest wound, and ended the battle decisively.	Solidified Uchiha Kei's reputation as a formidable ninja, showcasing his precision, strategy, and adaptability. It contrasted his "art of combat" with the Raikage's brute force and demonstrated his ruthlessness 450.
Five Clan Heads (Shirai Naoki, Hozuki Ginyue, Hagoromo Masaya, Fuma Yohei, Hoshigaki Shihira)	Fire Style, Susanoo, Eternal Mangekyo Sharingan, swordsmanship	Uchiha Kei used his Fire Style to evaporate Water Style techniques and summoned his Susanoo to defend against and counter Kekkei Genkai attacks. The battle was ongoing, with powerful hits exchanged.	Highlighted the power of Kekkei Genkai abilities, the importance of teamwork among the Clan Heads, and Uchiha Kei's powerful Fire Style and Susanoo. It also showed the danger of underestimating opponents 508.
Kakashi	Taijutsu, ninja sword	Uchiha Kei easily defeated Kakashi during a training session, kicking him hard.	Showcased Uchiha Kei's superior combat skills even in a training environment and his "ruthless" approach, which Kakashi noted 72.
Ōtsutsuki Isshiki (disguised as Jigen)	Rinnegan analysis, strategic assessment	Kei identified limitations in Isshiki's otherwise overwhelming abilities while resisting his attempt to make Kei into a pawn.	Marked Kei's confrontation with an Ōtsutsuki-level threat and demonstrated the analytical utility of his Rinnegan against powers beyond the ordinary ninja world 677.

Uchiha Kei has engaged in numerous battles, demonstrating a combat style characterized by precision, strategic thinking, and adaptability, often leveraging his Sharingan and Mangekyo Sharingan abilities 36 450 491. His encounters range from swift eliminations of multiple low-level Iwa Ninja to intense clashes with formidable opponents like the Fourth Raikage, Kitsuchi of Both Scales, and a coalition of five Clan Heads 36 24 450 508.

Early in his career, Uchiha Kei displayed exceptional skill in sneak attacks, using his Sharingan and Body Flicker Technique to eliminate at least 12 Iwa Ninja squads. He recognized the enemy's low to mid-level strength and adjusted his tactics, using a Fire Style jutsu to initiate attacks before switching to Taijutsu to conserve Chakra 36. This demonstrated his strategic thinking and ability to adapt to the situation while managing his resources.

His prolonged engagement with Kitsuchi of Both Scales and other Iwa Ninja further showcased his strategic prowess. Uchiha Kei used his Sharingan's dynamic vision and Body Flicker Technique to evade Kitsuchi's powerful Earth Style jutsu and other attacks, constantly changing his speed and direction 24 25. He strategically eliminated other Iwa Ninja first, using a Shadow Clone to distract Kitsuchi, which enraged his opponent 26. Despite facing a powerful opponent with immense vitality, Uchiha Kei remained calm, though he acknowledged the difficulty and the need for his Mangekyo Sharingan or the ability to summon Namikaze Minato as trump cards 24 27. When cornered and low on Chakra, he used Time Rewind to slow time and defeat Kitsuchi as well as the remaining Iwa Ninja 28. This battle also highlighted the contrast between Uchiha Kei's calm, strategic approach and the emotional responses of his opponents, such as Kitsuchi's rage 26.

Against the Ishi-mizu-shu Squad, four skilled Iwa Ninja, Uchiha Kei faced a coordinated attack designed to counter his Sharingan, which left him injured and exhausted. This forced him to activate his Mangekyo Sharingan and utilize its Time Leap ability, significantly increasing his speed and agility. With this enhanced ability, he quickly dispatched three of the Iwa Ninja and overpowered the last one, showcasing his resilience and willingness to use powerful, Chakra-intensive techniques when necessary 47. This encounter underscored the importance of teamwork against individual strength and the physical and mental costs associated with using advanced abilities 47.

In a later confrontation with Root ninjas, including a Yamanaka Clan member, Uchiha Kei demonstrated his immense strength and skill with his Eternal Mangekyo Sharingan. He easily defeated the Yamanaka ninja and then engaged the remaining Root ninjas, using a combination of Fire Style, Chidori, and swordsmanship. Kakashi, observing this battle, recognized Uchiha Kei's combat style as the "true art of the Uchiha Clan," characterized by the Sharingan's insight, precise strikes, and a lack of flashiness, aiming to finish enemies with maximum speed 491. This battle was significant in defining Uchiha Kei's unique combat philosophy, which Kakashi himself adopted and refined under Kei's guidance 491.

One of Uchiha Kei's most notable battles involved the Fourth Raikage. In this encounter, Uchiha Kei severely injured the Raikage twice, first by exploiting his weaknesses and then by combining Genjutsu with Chidori to tear open a previous wound on his chest 450. This battle was described as an "art of combat" by Hyuga Aya and other Konoha ninja, emphasizing Uchiha Kei's understated control, calm grasp of the situation, and ability to suppress a powerful opponent from start to finish. He only briefly used a pitch-black Chakra Giant (Susanoo) to block an attack before ending the fight with precision 450. Namikaze Minato viewed Uchiha Kei's methods as dangerous but justified, recognizing his confidence and strategic acumen 450.

Finally, Uchiha Kei intercepted five Clan Heads (Shirai Naoki, Hozuki Ginyue, Hagoromo Masaya, Fuma Yohei, and Hoshigaki Shihira) who were pursuing the Yuki Clan. In this multi-opponent battle, Uchiha Kei used his Fire Style to evaporate their Water Style techniques and summoned his Susanoo to defend against their coordinated Kekkei Genkai attacks. He faced powerful hits from Hoshigaki Shihira and Hagoromo Masaya, while Fuma Yohei attempted to suppress his Susanoo with Mandala Binding. This ongoing battle highlighted the power of Kekkei Genkai abilities, the Clan Heads' teamwork, and Uchiha Kei's formidable defensive and offensive capabilities with his Fire Style and Susanoo 508.

Even in training, Uchiha Kei's combat style was evident. During a session with Kakashi, he easily defeated his silver-haired opponent, kicking him hard and prompting Kakashi to comment on his "ruthlessness." This interaction, while a training exercise, further illustrated Uchiha Kei's intense and effective combat approach 72.

His confrontation with Ōtsutsuki Isshiki represented a new class of battle. While Kei recognized that Isshiki's power was beyond ordinary comprehension, he used his Rinnegan to study the opponent's techniques, identify weaknesses, and resist Isshiki's intention to turn him into a vessel or pawn 677.