Kamizuki Yu

Biodata

Feature	Value
Name	Kamizuki Yu (神月佑)
Alias(es)	Guardian Star of the Hidden Leaf; Chief Honorary Advisor; Hidden Mist Village's savior and eternal guardian; Divine Moon; Night King; Master of Ruin No. 003; Prince of the Silver-Blue Empire 7 16 50 440 472 522
Species/Race	Human; a transmigrated former office worker inhabiting the body of a dying Hidden Leaf genin. Following later interworld journeys, he has repeatedly adapted to and surpassed the laws of foreign worlds 1 396 567
Gender	Male
Affiliation	Konohagakure; allied with Kirigakure; former commander of the reorganized Akatsuki's operations; leader of a growing transworld network of retainers and guards 16 42 50 86 492 494
Occupation/Role	Shinobi; Chief Honorary Advisor to the Hokage; strategist, instructor, and founder of the proposed Divine Guard special unit; former special supervisory commissioner of the Seventh Legion; interworld cultivator and instructor 16 26 41 475 631
Status	Active 639
First Appearance	Chapter 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Perfect Sage Body	1	Received from the God-Tier Check-In System; rapidly healed his battlefield wounds and granted exceptional physical ability.
Eternal Mangekyō Sharingan	1	Obtained at the Hidden Leaf Memorial Monument; grants Kamui and Tsukuyomi.
Flying Thunder God Technique (Perfect Mastery)	3	Gained at the Leaf command tent, including formula-improvement concepts.
Weighted Rock Technique	4	Acquired after assassinating Hidden Rock's frontline commander, Earth Dragon.
Dust Release	5	Awakened at Bird Slope Passage; used Atomic Dismantling Jutsu to destroy nearly a hundred Rock shinobi and their supplies.
Partial Asura Chakra	7	Obtained beneath Hashirama's Hokage Rock carving; strengthened his Sage Body and Wood Release affinity.
M@@REF_ENTITY_14736643@@X Uzumaki Bloodline and Adamantine Sealing Chains	8	Gained at the Uzumaki Clan Shrine; greatly improves chakra recovery and grants perfect mastery of the chains.
Izanagi and Izanami (no side effects)	10	Obtained from the Nanga Shrine stone tablet.
Uchiha Style Swordsmanship Mastery	17	Acquired by checking in within Uchiha Clan territory.
Fire Release: Great Fire Annihilation	17	Acquired at the Uchiha main household.
Kotoamatsukami Trial Card	17	A single-use trial card obtained at Shisui Uchiha's training ground.
Wood Release and Hashirama-cell compatibility	18	Obtained beneath Hashirama's statue at the Valley of the End; can create and dismiss forests at will.
Modified Kotoamatsukami	21	Enhanced version with a greatly reduced cooldown, greater control, and the ability to reinforce his own will or break genjutsu.
Uchiha Stone Tablet Interpretation Authority	21	Obtained alongside Modified Kotoamatsukami; enabled a complete reading of the tablet and a glimpse of Kaguya's secrets.
Complete Guide to Paper Release Secret Arts	29	Obtained at a Hidden Rain battlefield memorial; includes improvements suited to Konan's techniques.
Perfect White Snake Sage Mode and improved Cursed Seal	36	Obtained at Dragon Cave's entrance; allows instant Sage Mode activation with near-perfect compatibility.
Rinnegan abilities	36	Used to locate Dragon Cave's hidden entrance and later prevent Orochimaru's Living Corpse Reincarnation escape.
Vast Water-Style Chakra Affinity	43	Obtained at the Water Country Daimyo's estate; includes ultimate mastery and improvement potential for known Water Style techniques.
Boil Release and Lava Release	44	Bloodline limits obtained by checking in at the Mizukage's office.
Perfect Nine-Tails Chakra Mode	46	Revealed alongside Sage Mode while fighting Yagura's Three-Tails transformation.
God-Tier Forging Technique	86	Obtained at the core furnace of the Village of Artisans; grants divine-level forging knowledge for weapons, materials, and equipment.
Flying Ninja Tool Mastery and Zero-Tails Chakra	92	Acquired at Angkor Fortress; includes complete flying-tool and fortress blueprints, while the hostile Zero-Tails chakra was absorbed and suppressed.
Divine Tree Origin Remains/Projection	100	Received the Divine: Deep Forest Emergence ability and Chakra Fruit Essence, together with authority linked to the world's foundational life energy.
Rinne Sharingan	101	His ocular powers evolved in chaotic space, granting perception of causal networks, souls, and temporal possibilities on a world-spanning scale.
Six Paths Power and Truth-Seeking Orbs	139	Demonstrated Six Paths-level authority through Truth-Seeking Orbs and techniques capable of neutralizing Otsutsuki divine arts.
Otsutsuki Bloodline Purification Secret Technique	138	Obtained at the Otsutsuki Elder Temple; enables purification and refinement of Otsutsuki bloodline power.
Divine Art: Takamagahara	138	A domain-type divine art that suppresses hostile targets while strengthening Yu's own attributes within its field.
Scale Alteration of All Things	139	Used to counter and reverse Mengshi's law-based deprivation technique at amplified strength.
Cosmic Origin Law: Chapter of Creation and Destruction (A Trace)	148	Obtained at the Otsutsuki Civilization Core; gives Yu a trace-level grasp of cosmic laws governing creation and destruction.
Power to Create/Destroy a Star (One-Time Perfect Experience Card)	148	A one-use perfect-experience reward capable of exercising stellar-scale creation or destruction.
Six Powers M@@REF_ENTITY_14736643@@X	159	Obtained at Marine Headquarters; grants complete mastery of the World Government's ultimate physical techniques.
God of Destruction Authority (Controlled Version)	257	Controlled destruction authority acquired at the God of Destruction's planet.
Ultra Instinct Cultivation Method	257	S+ cultivation method for instinctive, autonomous combat movement.
Strength Gu Law Insight	308	By analyzing the Strength Gu, Yu gained insight into the law of strength and learned that deeper law-comprehension reduces foreign-world suppression.
Myriad Forms Gu applications	318	Demonstrated the ability to analyze, replicate, improve, and turn hostile techniques back upon their users.
Gene Origin Energy Cultivation Method: Ninefold Thunder Blade	402	Acquired an incomplete first-layer fragment at a survivor camp and cultivated it to establish martial-artist strength.
Danger Perception	404	Detects impending physical danger and hostile killing intent.
Breath Concealment Technique	411	Conceals genetic-energy fluctuations and life aura, allowing Yu to appear unremarkable.
Ninefold Thunder Blade, Second and Third Levels	412 420	Acquired the incomplete second and third levels at an abandoned Extreme Martial Hall, then advanced through the third level through gravity-room cultivation.
Life Essence	415	Greatly elevated his body, speed, neural reactions, and psychic range to advanced-warrior levels and beyond.
Black God Suit (Incomplete Version)	427	A highly resilient combat suit whose initial integration spread an indestructible protective power through Yu's body.
Vibranium-infused Arc-Light Throwing Knives	432	A trace amount of Vibranium was fused into his throwing knives, sharply improving their speed, sharpness, and defensive qualities.
Control Talent (weak)	450	Obtained by checking in at Luo Feng's home; provides a foundation for psychic-control cultivation.
Mental Illusion (Beginner)	453	Acquired from the Statue of Tranquility, allowing the construction of mental illusions.
Innate Secret Technique: Enslavement	461	Used within the Golden Horned Beast's mental world to subjugate the world-destroying beast.
Psychic Disguise: Mimicry	465	Allows Yu to mimic an overwhelming ancient psychic aura and conceal the true nature of his power.
Mechanical Modification Technology (Beginner)	477	Acquired from a mechanical-race command ship wreckage; includes foundational mechanical structures, energy cores, and artificial-intelligence knowledge.
Divine Soul Rune	486	A versatile soul rune capable of absorbing and neutralizing powerful soul attacks.
Breath Simulation (Advanced)	494	Advanced concealment technique obtained from a black-market intelligence terminal; reduces the detectability of his presence.
Primordial Energy Affinity (Physique)	522	Enhances his physique's affinity for the Primordial Secret Realm's energy.
Imitation Chaos City Lord Token	522	A check-in reward obtained at Estate No. 1 in the Primordial Secret Realm.
Enlightenment Tea	522	Obtained while observing Luo Feng's Universe Genius Battle; assists comprehension and cultivation.
Soul Secret Art: Heart Demon Guide	559	A soul technique that evokes and magnifies an opponent's fears and inner demons.
Origin Adaptability	567	Enables Yu to adapt to an unfamiliar world's laws and recover strength previously suppressed by them.
Fortune Canopy	587	A passive defensive ability that automatically eliminated assassins infiltrating the State Preceptor Residence.
World Tree Sapling (Origin Continent Version)	600	Obtained from the Origin Core; a foundational treasure that can suppress laws and transform chaotic void into the basis of a perfect universe.

Background / History

Kamizuki Yu was formerly an office worker before transmigrating into the body of a dying Hidden Leaf genin during the Third Shinobi World War. His God-Tier Check-In System immediately granted him the Perfect Sage Body, saving his life, and the Eternal Mangekyō Sharingan shortly afterward. He used Kamui and Tsukuyomi to kill two Iwa ninja, deciding that survival and strength took precedence in the shinobi world 1.

Yu emerged from the war as an overwhelming and highly visible force. He routed Rock shinobi, impressed Minato Namikaze with his spatial techniques, proposed the operation against Bird Slope Passage, assassinated the Rock commander Earth Dragon, and defeated Ōnoki with superior Dust Release 2 3 4 5 6. Afterward, Konoha recognized him as the Guardian Star of the Hidden Leaf, awarding him special-class merit, ten million ryo, and three S-rank ninjutsu scrolls 7.

After reshaping the political order of the shinobi world, Yu broadened his ambitions beyond individual villages. He recruited dangerous specialists such as Deidara and Sasori, acquired the means to develop advanced armaments, and began preparing forces capable of opposing the Otsutsuki Clan rather than relying solely on his own strength 84 86.

Yu ultimately uncovered and challenged the deeper forces manipulating the shinobi world. His Rinne Sharingan exposed Black Zetsu and Kaguya's influence, he destroyed Black Zetsu's will, subdued Kaguya, neutralized Isshiki's control over Jigen and Kawaki, and defeated multiple Otsutsuki elders and their fleets 101 119 126 128 138 139 140.

Following the unification and stabilization of the shinobi world, Yu began traveling through other worlds. His system continued to function across radically different power systems, though foreign laws sometimes suppressed his strength until he analyzed or adapted to them. His later journeys have brought him into contact with the worlds of pirates, martial artists, cosmic cultivators, Gu users, the Imperium of Man, the Origin Continent, and Soul Masters 159 308 396 567 620.

Appearance

Yu has a youthful face and typically presents himself with a calm, approachable demeanor despite his reputation. He is first seen in Hidden Leaf shinobi attire and a forehead protector; later, he is described as wearing plain, clean clothing 3 6 20.

• Crimson, pinwheel-patterned Sharingan eyes when using his Eternal Mangekyō Sharingan 3.
• Purple, snake-like markings appear around his eyes in Perfect White Snake Sage Mode 36.
• Often appears relaxed or unhurried even in hostile situations 9 46.
• His golden chakra and sealing power become visible when using advanced Nine-Tails Chakra Mode and Adamantine Sealing Chains 14 46 47.
• His evolved Rinne Sharingan grants an elevated, world-encompassing perspective that distinguishes him from ordinary ocular-power users 101.
• During his interstellar activities, he has adopted a black cloak and detection-concealing mask under the identity of the Night King 520.
• He also uses ordinary casual clothing, forged identities, and concealment techniques to avoid unnecessary attention in unfamiliar worlds 416 465 494.

Personality

Yu is pragmatic, controlled, and intensely self-reliant. Having begun his new life on a battlefield, he initially intends to keep a low profile until he has sufficient strength, yet he does not hesitate to act decisively once a threat becomes clear 1 9. He prefers taking initiative over waiting for enemies such as Obito or Danzo to make the first move 9 23.

Though usually outwardly calm and even languid, Yu is ruthless toward those he considers dangerous or corrupt. He destroys Root after Danzo targets Shisui, breaks Orochimaru's escape attempt without mercy, and intends to exploit Orochimaru's knowledge rather than allow it to be lost 23 37 40.

Yu also possesses strong strategic and political instincts. He pushes the Uchiha Clan toward internal reform and reintegration rather than confrontation, assigns governing responsibilities to Yahiko, Nagato, and Konan, and guides Mei Terumi's reconstruction of Kirigakure 17 20 34 48. His mentorship is direct and individualized, focusing on practical improvement rather than empty encouragement 41.

His later travels reinforce both his curiosity and his detachment from conventional authority. Yu is more interested in unfamiliar laws, energy systems, technologies, and check-in sites than wealth, status, or political ceremony, and routinely treats rulers and legendary figures as potential sources of information or resources 369 453 475 600.

Despite this detachment, Yu is not indiscriminately cruel. He honors fallen Hidden Rain shinobi, protects people whose ideals he finds worthy, improves a vulnerable village's living conditions with a spirit-gathering formation, and has repeatedly saved groups he regards as useful or undeserving of their circumstances 29 34 411 574.

Abilities & Skills

God-Tier Check-In System

Yu's system rewards him for checking in at significant locations, granting bloodlines, techniques, affinities, and specialized knowledge.

• Rewards have included the Perfect Sage Body, Eternal Mangekyō Sharingan, Flying Thunder God Technique, Dust Release, Wood Release, and multiple kekkei genkai 1 3 5 18 44.
• He deliberately seeks historically or politically significant sites to expand his strength 7 8 10 18 43.
• System rewards also provide technical insight, such as Flying Thunder God formula improvements and Water Release mastery 3 43.
• The system remains active across other worlds and adapts its rewards to local power systems, granting martial-artist cultivation methods, Gu-related insights, psychic abilities, mechanical technology, and cosmic treasures 402 308 453 477 522.
• Yu prioritizes rare locations, high-level remains, political centers, and the residences of important figures, since they consistently produce more valuable rewards 86 148 450 600.

Sage Body and Chakra Modes

Yu's Perfect Sage Body provides extraordinary vitality, physical power, sensory ability, and compatibility with natural energy.

• Rapidly healed his fatal battlefield injuries after transmigration 1.
• Combines with Partial Asura Chakra to further enhance his vitality, speed, and Wood Release affinity 7 9.
• Can enter Perfect White Snake Sage Mode instantly, without the long preparation or instability associated with other snake sage transformations 36.
• Used Perfect Nine-Tails Chakra Mode together with Sage Mode to overwhelm Yagura's Three-Tails transformation 46.
• His later Life Essence enhancement reconstructed his body on a cellular level, greatly improving strength, speed, durability, and psychic capacity even in a world where his original power had been reset or suppressed 396 415.
• Origin Adaptability allows him to restore and adjust his strength when confronted with unfamiliar world laws 567.

Eternal Mangekyō Sharingan

Yu's Eternal Mangekyō Sharingan is his primary ocular power and is described as vastly stronger than ordinary Mangekyō Sharingan.

• Its ocular pressure overwhelmed both Itachi and Shisui during his demonstration at Nanga Shrine 20.
• Grants access to Kamui and Tsukuyomi 1.
• Does not suffer the side effects or instability normally associated with Mangekyō-level techniques 9 10.
• Its investigative power, when paired with the Rinnegan, let Yu identify and surgically remove Obito's deeply rooted control from Yagura's consciousness 47.

Rinne Sharingan and Higher Ocular Powers

Yu evolved his ocular abilities beyond the Eternal Mangekyō and conventional Rinnegan.

• Awakened the Rinne Sharingan in chaotic space, allowing him to perceive causal relationships across the shinobi world, distinguish souls by their colors, and observe past, present, and future possibilities 101.
• Used this perspective to expose Kaguya's will concealed within White Zetsu and to alter the Uchiha stone tablet so that Black Zetsu's manipulations no longer served Kaguya's plan 101.
• His Rinne Sharingan rendered Mengshi's Divine Art: Endless Dreamscape ineffective and supported his countermeasures against law-based soul attacks 139.
• Its pressure alone later overwhelmed opponents who lacked any meaningful understanding of higher ocular power 234.

Kamui

Yu's system-optimized Kamui is more powerful, stable, and less draining than Obito's version.

• Warps space to erase targets, including an Iwa jonin and Hidden Rock commander Earth Dragon 2 4.
• Can directly suppress Obito's Kamui and interfere with his intangibility 9.
• May be combined with physical attacks, allowing Yu to strike through a momentary disruption in Obito's defense 9.
• Used for infiltration, pursuit, evasion, and destroying Root's defenses 16 23.
• Developed Intangibility Traversal, becoming transparent and passing through an Otsutsuki flagship's armor and energy shield to assassinate its commander 137.

Tsukuyomi and Mental Techniques

Yu possesses high-level genjutsu and mental interference abilities.

• Tsukuyomi can break Root elites mentally and turn them against one another 23.
• Modified Kotoamatsukami has reduced cooldown, enhanced control, and can strengthen Yu's will or break genjutsu affecting himself 21.
• He precisely removed Obito's deeply embedded genjutsu from Yagura without destroying Yagura's mind 47.
• He erased the memories of Root operatives tracking him 16.
• Mental Illusion and the Heart Demon Guide supplement his established genjutsu, enabling him to construct illusions and magnify an opponent's fear or inner demons 453 559.
• Psychic Disguise: Mimicry lets him fabricate a terrifying psychic presence that conceals his actual nature and overwhelms observers 465.

Izanagi and Izanami

Yu possesses no-side-effects versions of both Uchiha forbidden techniques.

• Obtained at the secret stone tablet beneath Nanga Shrine 10.
• Demonstrated the ability to counter Danzo's reliance on Izanagi during the Root confrontation 23.
• Continued to employ Izanami as a means of establishing mental links and identifying weaknesses in powerful enemies 213.

Flying Thunder God Technique

Yu has perfect mastery of the Flying Thunder God Technique and understands how to improve its formula system.

• Defeated Tokuma Hyuga through superior speed after gaining the technique 3.
• Uses optimized teleportation to reach hostile targets without being detected 9.
• Travels rapidly across nations and battlefields 29.
• Later combines spatial movement, Kamui, and his growing knowledge of foreign systems to cross battlefields, planets, and even interworld boundaries 112 450 477.

Elemental Releases and Bloodline Limits

Yu possesses an unusually broad range of elemental and bloodline abilities.

• Dust Release — His Atomic Dismantling Jutsu annihilated a large Rock force and overpowered Ōnoki's own Dust Release 5 6.
• Wood Release — Can create massive forests, bind opponents, breach fortifications, and suppress entire groups of Root shinobi 18 22 23.
• Water Release — Has immense Water-Style affinity and mastery; used advanced Water Release to bypass Kirigakure's security 43 44.
• Lava Release and Boil Release — Acquired at the Mizukage's office 44.
• Fire Release: Great Fire Annihilation — Acquired from the Uchiha main household check-in 17.
• Weighted Rock Technique — Hidden Rock secret art acquired after Earth Dragon's death 4.
• Divine: Deep Forest Emergence — A higher Wood Release-derived ability obtained from the Divine Tree's origin remains 100.

Adamantine Sealing Chains

Yu has perfect mastery of the Uzumaki Clan's Adamantine Sealing Chains.

• Bound and subdued the Nine-Tails using senjutsu and Asura Chakra 13 14.
• Can combine the chains' sealing properties with compressed chakra to suppress tailed-beast power 46.
• Restrained Yagura, suppressed the Three-Tails' chakra, and cut off possible remote-control methods 47.
• Used the chains to seal Danzo after defeating him 23.

Rinnegan

Yu's Rinnegan grants advanced perception and techniques beyond his Sharingan abilities.

• Located Dragon Cave's concealed entrance by observing natural-energy fluctuations 36.
• Prevented Orochimaru from escaping through Living Corpse Reincarnation 37.
• Enhanced his analysis of Yagura's mental world during the removal of Obito's genjutsu 47.
• Uses the Human Path with extraordinary precision, extracting souls and information from Otsutsuki targets while separating Karma from Kawaki without unnecessarily harming him 128 137.
• Can soothe damaged souls through Yin Release: Soul Soothing 128.

Six Paths Power, Divine Arts, and Law Manipulation

Yu's later powers operate on the level of domains, laws, souls, and cosmic principles.

• Truth-Seeking Orbs can nullify high-level attacks, including an Otsutsuki elder's Heaven-Shattering Earth-Splitting Slash 139.
• Takamagahara forms a domain that weakens intruders and strengthens Yu, allowing him to confront multiple Otsutsuki elders on favorable terms 138 139.
• Scale Alteration of All Things allows him to alter and reverse the scale of hostile law-based phenomena 139.
• His grasp of the Cosmic Origin Law enabled him to erase Ise's black-sun attack by changing the governing laws of the affected space 148.
• Controlled God of Destruction Authority and the Ultra Instinct method further expanded his destructive and instinctive combat potential 257.
• Yu later established the End Universe within his dantian, where laws of creation and destruction continuously interact under his control 559.

Psychic Power and Martial Cultivation

In worlds governed by genetic energy and psychic power, Yu developed an independent martial path rather than relying exclusively on chakra.

• Cultivated the Ninefold Thunder Blade, using psychic precision to master the technique's intricate energy frequencies far faster than ordinary martial artists 402 412.
• Reached advanced-warrior physical standards after absorbing Life Essence and continued toward war-general and warlord thresholds through combat and gravity-room training 415 420.
• His psychic perception expanded from a few hundred meters to an eight-hundred-meter radius after a major transformation, with greatly increased control and precision 423.
• Can use psychic force at a structural level, dismantling matter and enemy biological techniques rather than simply applying impact or cutting force 426.
• Subjugated the Golden Horned Beast through a direct mental confrontation and Innate Secret Technique: Enslavement 461.

Forging, Engineering, and Equipment Development

Yu has accumulated advanced technical knowledge from multiple worlds.

• God-Tier Forging Technique enables him to evaluate and improve weapons and materials beyond ordinary shinobi craftsmanship 86.
• Complete flying ninja-tool and Angkor Fortress knowledge gave him access to advanced energy circuits, flight armor, and fortress blueprints 92.
• Mechanical Modification Technology provides foundational knowledge of artificial intelligence, mechanical structures, and energy cores 477.
• He personally fused Vibranium into his Arc-Light Throwing Knives with fine psychic control instead of relying on an outside forging master 432.

Strategy, Governance, and Instruction

Yu is a highly capable planner, political adviser, and teacher.

• Proposed severing Hidden Rock's supply line at Bird Slope Passage and recommended Minato lead the elite operation 3.
• Guided Fugaku, Itachi, and Shisui toward a plan to prevent the Uchiha Clan's destruction 17 20 21.
• Proposed the Divine Guard, a special unit above regular ANBU with former Root-style intelligence and mission authority 26.
• Provided tailored instruction to Naruto, Sasuke, and Sakura in chakra control, Sharingan combat integration, and medical ninjutsu potential 41.
• Directed Hidden Rain's postwar recovery through policies on production, taxes, orphan care, and support for the wounded and disabled 34.
• Taught Killer B a more balanced approach to communicating with and guiding tailed-beast chakra, earning Gyūki's recognition 57.
• His later instruction continues to emphasize strict practical control over raw power, including training Soul Masters to walk on water through constant, controlled energy output 631 632.

Equipment / Weapons / Items

• Hidden Leaf forehead protector — Worn during his first recorded meeting with Minato 3.
• Three S-rank ninjutsu scrolls — Received as part of Konoha's reward for his role in ending the Rock conflict 7.
• Water Country jade pendant — Granted by the Water Country Daimyo, authorizing Yu to investigate Hidden Mist affairs on the country's behalf 43.
• Kotoamatsukami Trial Card — Single-use item obtained at Shisui's training ground before he later acquired Modified Kotoamatsukami 17 21.
• Kusanagi Sword — A sword Yu later wielded to demonstrate spatially transcendent swordsmanship to Zoro 200.
• Third-Generation Standard Combat Suit and combat saber — Obtained upon entering Jiangnan Base City and used to establish a plausible martial-artist identity 416.
• Black God Suit (Incomplete Version) — A high-grade defensive suit gained at the Extreme Martial Hall headquarters 427.
• Arc-Light Throwing Knives — Psychic weapons later strengthened with a trace amount of Vibranium 432.
• Sky Shuttle — Used to wound and mentally subjugate the Golden Horned Beast 461.
• Imitation Chaos City Lord Token — A check-in reward associated with Estate No. 1 in the Primordial Secret Realm 522.
• World Tree Sapling (Origin Continent Version) — A universe-foundation treasure obtained from the Origin Core 600.

Relationships

• Minato Namikaze — Close ally and trusted political partner. Minato assigned Yu to his direct squad, invited him to serve as his future right-hand man, and later trusted him completely as Chief Honorary Advisor 3 7 16.
• Kushina Uzumaki — Grateful ally. Yu saved her, Minato, Naruto, and Konoha during the Nine-Tails Attack 13 14.
• Obito Uchiha — Principal adversary. Yu identified him early, disrupted his Kamui, cracked his mask, later defeated him again during the Nine-Tails Attack, and continues to oppose his Eye of the Moon plan 9 13 47 48.
• Fugaku Uchiha — Political ally in reforming the Uchiha Clan. Yu pressured Fugaku to choose reintegration and internal reform over confrontation 17 20 25.
• Itachi Uchiha — Protégé and key figure in Yu's Uchiha reform plans. Yu identifies Itachi as a bridge between the clan and the village 20 21.
• Shisui Uchiha — Protégé and protected ally. Yu saved Shisui from Danzo's ambush and regards his Mangekyō as a tool to protect what he values 20 22 23.
• Danzo Shimura — Enemy. Danzo surveilled Yu and targeted Shisui's eyes; Yu retaliated by destroying Root, defeating Danzo, reclaiming stolen Sharingan, and sealing him. Danzo's death and Root's disbandment later reshape Konoha's politics 16 22 23 25.
• Yahiko, Nagato, and Konan — Allies and political protégés. Yu saved them from Hanzo's coercion and later assigned them leadership, deterrence, and intelligence/logistics duties in Hidden Rain 30 34.
• Orochimaru — Captured adversary and unwilling research asset. Yu defeated him, stopped his escape technique, exposed his human experimentation, and planned to extract the value of his knowledge for Konoha 37 38 40.
• Yagura Karatachi — Former adversary turned grateful ally. Yu defeated Yagura's tailed-beast form, removed Obito's genjutsu, and left Yagura to atone through reforming Kirigakure 46 47 48.
• Mei Terumi — Allied Mizukage and admirer. Yu saved her resistance movement, advised her during Kirigakure's reconstruction, and became the village's recognized guardian 46 48 50.
• Kisame Hoshigaki — Recruited subordinate and liaison. Yu persuaded Kisame to abandon his role as a weapon of the Bloody Mist, then positioned him as a bridge between Kirigakure and himself 49 50.
• Killer B and Gyūki — Allies. Yu earned Killer B's heartfelt recognition after teaching him a more harmonious method of guiding Eight-Tails chakra, while Gyūki directly acknowledged Yu's exceptional understanding of tailed beasts 57.
• Deidara and Sasori — Recruited rogue-ninja specialists. Yu brought both under his command and intends to use their artistic, explosive, puppet, and technical talents in his broader military-development plans 84 86.
• Kaguya Ōtsutsuki — Former existential threat turned subdued subject. Yu exposed and destroyed Black Zetsu's final will before forcing Kaguya to confront the extent of his Six Paths-level power 101 119.
• Naruto Uzumaki and Sasuke Uchiha — Long-term protégés whose lives were fundamentally altered by Yu's intervention. They later fight as trusted core allies against Otsutsuki forces 14 41 137.
• Kawaki — Protected victim of Otsutsuki exploitation. Yu used the Human Path to remove Kawaki's incomplete Karma and restored his body with Wood Release-derived life energy 128.
• Luo Feng — A figure Yu initially observed from afar as a future powerhouse. Yu later acquired Control Talent through a check-in at Luo Feng's home and became involved when Luo Feng faced an existence-erasure crisis 450 554.
• Chaos City Lord — A wary ally and senior human leader who recognizes Yu as a dangerous but indispensable variable. He repeatedly attempts to caution Yu against confronting threats such as World Beasts and higher cosmic powers 522 554 560.
• Old Ghost — Former captain of Yu's personal guards. After surviving the loss of their comrades and searching for Yu for years, Old Ghost was recruited into Yu's new crew 492 494.
• Reno and the Imperial Guard — Subordinates assigned to Yu during his tenure in the Silver-Blue Empire. Reno's shock at Yu's destruction of a mechanical-race fleet turned into fervent loyalty 475 477.
• Tang San and the Shrek students — Later pupils subjected to Yu's severe practical training. Yu forces them to master basic control, resilience, and combat fundamentals rather than rely solely on martial souls or inherited techniques 620 631 632.
• Tang Hao — Initially defeated and humiliated by Yu, then compelled into a subordinate role during Yu's activities around Shrek Academy 620 635 639.

Story Role / Major Arcs

Third Shinobi World War

Yu arrives in the shinobi world during the war, rapidly becomes a battlefield anomaly, and helps turn the conflict against Iwagakure. His assassinations, destruction of Bird Slope Passage, and victory over Ōnoki contribute to the end of the Rock front 1 4 5 6.

Konoha Guardian and Obito's Opposition

After receiving official recognition from Konoha, Yu gains Asura Chakra and Uzumaki sealing abilities, then actively seeks out Obito rather than waiting for him to act. He later prevents the Nine-Tails Attack from destroying Konoha, saving Minato, Kushina, and Naruto 7 8 9 13 14.

Uchiha Clan Reform and Root's Fall

As Chief Honorary Advisor, Yu intervenes in the escalating hostility between the Uchiha Clan and Konoha's elders. He recruits Fugaku, Itachi, and Shisui into a reform plan, protects Shisui from Danzo, destroys Root, and helps secure the Uchiha Clan's reintegration into village life 16 17 20 22 23 25.

Hidden Rain Reconstruction

Yu intervenes when Hanzo attempts to force Nagato to kill Yahiko. After saving the Akatsuki founders, he reshapes their movement into the governing core of a rebuilt Hidden Rain Village, emphasizing strength-backed peace and recovery policies 30 33 34.

Orochimaru's Capture

Yu acquires Perfect White Snake Sage Mode, intercepts Orochimaru's defection, defeats both Orochimaru and Manda, and exposes Orochimaru's human experimentation to Konoha. He subsequently advocates using Orochimaru's knowledge under restraint rather than simply executing him 36 37 38 40.

Hidden Mist Liberation

Yu investigates the Blood Mist era, gains Water, Lava, and Boil Release, exposes Obito's control over Yagura, and frees the Fourth Mizukage from genjutsu. He supports Yagura's purge, Mei Terumi's succession, Kirigakure's reconstruction, and a permanent alliance between the village and himself 42 43 44 46 47 48 50.

Cloud Village Exchange

Yu confronts the Fourth Raikage and Killer B, demonstrating a superior grasp of Lightning Release, tailed-beast chakra, and combat fundamentals. His instruction helps Killer B improve his relationship with Gyūki, while even the Raikage recognizes that Yu's arrival may reshape the shinobi world's balance 55 57.

Rogue Ninja Recruitment and Armament Development

Yu recruits Sasori and Deidara rather than eliminating them, then visits the Village of Artisans to acquire God-Tier Forging Technique. His objective expands from personal strength to building an armed force with the technology and logistics to challenge the Five Great Villages and the Otsutsuki Clan 84 86.

Divine Tree and Otsutsuki Conflict

Yu claims the Divine Tree's remaining authority, awakens the Rinne Sharingan, exposes Black Zetsu's manipulation, and begins openly confronting Otsutsuki threats. He defeats Momoshiki's group in their first clash, subdues Kaguya, removes Kawaki's Karma, infiltrates the Otsutsuki command structure, and defeats the elder council through Six Paths power and divine arts 100 101 112 119 128 137 138 139 140.

Interworld Wanderings

After the shinobi world's stabilization, Yu travels through multiple worlds where he continues using the system to acquire local powers. His encounters include disrupting the Summit War, confronting the World Government and CP0, guiding Luffy and Zoro, overwhelming Dragon Ball-era opponents, and studying Gu-world laws 160 177 200 234 308.

Devour the Starry Sky Journey

Yu enters a world of genetic-energy martial artists with his power initially reduced, rebuilds his physical and psychic strength through Ninefold Thunder Blade and Life Essence, establishes himself in Jiangnan Base City, and gains access to increasingly important ruins and cosmic institutions. He subjugates the Golden Horned Beast, enters the Primordial Secret Realm, and becomes a major anomaly in the cosmic human faction 396 402 415 427 461 522.

Origin Continent Exploration

After reaching the Origin Continent, Yu encounters a world whose ordinary villagers and beasts can initially overwhelm his suppressed body. Through Origin Adaptability and continued cultivation, he recovers his strength, becomes involved with imperial politics, and obtains the World Tree Sapling from the Great Evolution Imperial Dynasty's Origin Core 567 568 574 587 600.

Douluo Continent Intervention

Yu arrives in the Soul Master world, defeats Tang Hao, takes an interest in Tang San's future, and imposes harsh foundational training on the Shrek students. His presence overturns the local hierarchy, bringing even Titled and Peerless Douluo-level figures into his orbit or under his control 620 631 632 635 639.

Notable Quotes

“On the battlefield, any technique that kills the enemy is a good technique.” 3

“Your Kamui seems rather unstable.” 9

“Whoever dares to extend a claw will have that claw chopped off.” 18

“What difference is an ideal without the strength to protect it from a castle in the air?” 33

“He thinks he's the player, but he's only a piece on the board.” 47

“Too slow, too light, too weak.” 620

“I’m not a picky eater.” 560

Trivia

• Yu's optimized Kamui is strong enough to disrupt Obito's intangibility, although Yu acknowledges that Obito remains dangerous and requires vigilance 9.
• He has encountered the distant will of Kaguya Ōtsutsuki through the Uchiha stone tablet's secrets 21.
• Despite repeated public honors, Yu avoids crowds and reacts to grand ceremonies with marked indifference 7 50.
• His reforms alter the futures of Naruto and Sasuke: Naruto grows up with both parents alive, while Sasuke retains his clan and develops without the isolation caused by its massacre 14 41.
• Yu's usual desire to “lie flat” and avoid trouble repeatedly conflicts with his habit of investigating rare check-in sites and unusual energy phenomena 29 412 453.
• The Otsutsuki and several later cosmic factions repeatedly mistake Yu for a god, an ancient monster, or an undefinable higher-dimensional existence because conventional systems cannot accurately measure him 140 320 465.
• His power can be constrained by unfamiliar world laws, but he treats this as an analytical problem and systematically acquires the local laws or adaptations needed to bypass the restriction 308 567.