Uchiha Rei

Biodata

Feature	Details
Name	Uchiha Rei (宇智波零)
Alias(es)	Konoha's Grass; Hyuga Rei (cover identity) 112 129
Species/Race	Human; descendant of both the Uchiha and Hyuga clans 68
Gender	Male
Affiliation	Konohagakure; Team Rei
Occupation/Role	Konoha Jonin; team captain; founder and commander of an independent network of allies and clones 78 83 120
Status	Alive; afflicted with Kekkei Genkai Disease and frequently reliant on a wheelchair 176 333
First Appearance	Chapter 3

Background / History

Rei grew up in the Konoha Orphanage before joining the village's combat forces. Although born with Uchiha and Hyuga blood, he could not initially awaken either clan's dōjutsu; children of such unions were believed unable to make their Sharingan and Byakugan resonate. 68 77 237

At the Ninja Academy, Rei remained for the full three-year term rather than graduating early. He built his foundation through deliberate competition: ninjutsu against Might Guy, chakra control and reserves against Kakashi Hatake, and taijutsu and genjutsu exchanges with Kurenai Yuhi. His records credited him with surpassing Kurenai in genjutsu, Guy in ninjutsu, and Kakashi in chakra volume and control. 68

Seeking to awaken his eyes, Rei turned to Orochimaru after Tsunade declined his request to become her apprentice. Orochimaru's forced genetic-modification surgery awakened his dōjutsu, but the procedure left lasting complications and began Rei's hostile history with him. 68 237

During the Uchiha Clan crisis, Rei deduced that the apparent conflict between the Uchiha and Konoha's leadership concealed a larger struggle involving Akatsuki. He defeated Uchiha Rekka, gained Jonin-level Medical Ninjutsu through a sign-in reward, and later accepted Rekka as an informant and subordinate. 3 8 27

Rei subsequently fought Uchiha Itachi, resisted Itachi's Tsukuyomi, overwhelmed him in Fire Release and genjutsu, and entered the mental world reflected by Itachi's Tsukuyomi space. The encounter revealed the existence of the Totsuka Blade, the Yata Mirror, and the Uchiha clan's hidden vault. 13 14

Appearance

Rei is a black-haired, black-eyed man whose appearance is widely recognized throughout the Ninja World; his reputation as “Konoha's Grass” is closely tied to his exceptional looks. 112 225

• Usually conceals his eyes with goggles or specially made sunglasses. 129
• His left eye manifests as a red Sharingan/Mangekyō Sharingan, while his Byakugan turns his pupils white and causes veins around his eyes to bulge. 19 129 237
• Often wears a mask modeled after Obito's, designed to conceal his expression even from Byakugan users. 214
• Uses a wheelchair after the progression of his bloodline disease severely impairs his mobility. 176 225

Personality

Rei is calculating, patient, and difficult to manipulate. He assesses people in terms of utility, strength, loyalty, and hidden motives, as shown when he rated each member of his newly formed team before destroying the written record. 83 He regularly keeps information compartmentalized, employs clones and false identities, and refuses to leave evidence that enemies can exploit. 12 83

Despite his ruthless methods, Rei repeatedly protects people he has accepted as his own. He intervenes when Root attempts to seize Sasuke, helps Rekka escape Danzō's influence, treats wounded allies, and arranges covert protection for people remaining in Konoha. 10 25 120 317 His distrust extends even to praise and generosity; he teaches Toneri that compliments and gifts in the ninja world often carry hidden costs. 193

Abilities & Skills

Sharingan and Mangekyō Sharingan

Rei possesses a Sharingan in his left eye and eventually manifests the Mangekyō Sharingan. His ocular abilities grant him overwhelming perception, genjutsu prowess, and access to several dangerous techniques. 19 238

• His Mangekyō is associated with Magatsuhi, which he used during his early confrontation with Rekka. 3
• Can resist or evade ocular genjutsu, including Itachi's Tsukuyomi. 13
• Casts a Tsukuyomi-like illusion that traps victims inside a mental landscape reflecting their fears and subconscious. 13 14
• Perceives chakra formations and hidden mechanisms, allowing him to locate the entrance to the Uchiha clan vault. 14
• Can use or counter spatial techniques, including Kamui, during his battle against Obito. 46 47
• Possesses Eternal Rekindling, a Mangekyō ability capable of resurrecting the dead; Rei claims his own death triggered its awakening and returned him to life. 238
• Has knowledge of Susanoo through Itachi's memories, but cannot properly manifest it with only one Mangekyō eye. 99

Byakugan

Rei's right eye is a functional Byakugan, naturally awakened following Orochimaru's surgery. 19 128

• Sees through walls and examines internal injuries, poisons, and chakra abnormalities. 71
• Uses the Byakugan as a long-range observation tool and “X-ray lens.” 128
• Improved his Telescopic Technique and can activate it while wearing specially prepared sunglasses. 129
• Later learned Little Hyuga Clan techniques, becoming exceptionally compatible with their Byakugan-based taijutsu. 132 143
• His Byakugan may activate involuntarily when he sees something inappropriate. 120

Genjutsu and Phantom Clones

Rei's genjutsu talent predates the awakening of his dōjutsu and was later strengthened by the Kurama Clan's genjutsu ability. 68 8

• Creates Genjutsu Clones that are indistinguishable from his real body and capable of fighting independently. 12
• A dissipating clone can drag nearby enemies into an illusionary realm. 12 166
• Improved clones can self-destruct by detonating their chakra, delivering a potentially fatal attack. 166
• His clones, including Uchiha Rei One and Uchiha Rei II, operate separately for extended periods and undertake missions the original body cannot personally perform. 120 153 158
• Uses his Mental World abilities to recover sealed objects, including the Totsuka Blade. 188
• Can manipulate reality through genjutsu, but doing so to compensate for his inability to walk consumes life force. 176 193

Taijutsu

Rei's taijutsu is among his defining strengths. His extensive training placed him beneath only Might Guy among Konoha's known taijutsu specialists. 25

• Uses Konoha Whirlwind to incapacitate Root operatives with individual kicks. 25
• Overpowered Obito in direct combat despite Obito's Hashirama-cell-enhanced body. 47
• Learned Konoha Style and Little Hyuga Clan taijutsu, greatly enhancing his physical power and speed. 145 150
• Claims his taijutsu speed and force can reach the level of the Sixth or Seventh Gate of the Eight Gates. 145 150
• Can use enhanced Palm Rotation capable of reflecting ninjutsu when supplied with sufficient chakra. 143

Ninjutsu and Chakra Control

Rei is proficient in Fire Release, Shadow Possession, sealing techniques, and a range of unconventional ninjutsu.

• His Fire Style: Great Fireball Jutsu surpassed Itachi's in both hand-seal speed and output. 13
• Repelled Kakuzu and Konan with a Fire Release powerful enough to draw comparisons to Uchiha Madara's. 117
• Used Fire Release: Seven Stars Ninjutsu, empowered by a Hashirama Pill, to engulf an entire valley and defeat ten thousand enemy ninja. 322
• Used Shadow Possession alongside Fire Release to defeat powerful opponents from the Land of Lightning. 301
• Obtained Evil God Chakra, which he can reclaim from other users and employ in techniques such as Impure World Reincarnation. 186 302
• His chakra reserves were described as three times those of an ordinary Jonin and twice those of Kakashi Hatake. 25

Medical Ninjutsu

Rei obtained Jonin-level Medical Ninjutsu after signing in at Orochimaru's laboratory. 3

• Combines Medical Ninjutsu with Kurama Clan genjutsu for rare long-distance healing. 8
• Diagnoses internal injuries, poison, and chakra abnormalities using the Byakugan. 71
• Treated Samui after she suffered severe blood loss. 120
• His own medical knowledge has not cured his Kekkei Genkai Disease, which stems from an excess of Yin Chakra over Yang Chakra. 75 176

Phantom Cursed Seal

During Rei II's ten years inside the Box of Ultimate Bliss, he developed and refined the Phantom Cursed Seal. 158

• Engraves transparent black-rod powder into targets.
• Enables remote control over marked individuals.
• Was successfully applied to Yugito Nii and Uchiha Itachi. 158

Equipment / Weapons / Items

• Totsuka Blade — Divine sealing blade used to imprison Biwa Jūzō, Yugito Nii, Itachi, and other targets; later retrieved from Hōzuki Castle. 53 120 188
• Box of Ultimate Bliss — Legendary ninja tool linked to the mirror world and Rei II's ten-year confinement; Rei later recovered the genuine box. 154 193
• Wheelchair — Used due to his loss of mobility; one of his wheelchairs was made by Sasori. 193 253
• Sunglasses and goggles — Protect his eyes while allowing the use of the Telescopic Technique. 129
• Special masks — Obito-inspired masks that conceal the wearer's expressions and resist Byakugan observation. 214

Relationships

• Orochimaru — Former surgeon and recurring enemy. Orochimaru awakened Rei's dōjutsu through forced experimentation and later sought to exploit Rei's ties to Uchiha Ten, Uchiha One, and Hyuga Suzaku. 68 237 242
• Tsunade — Rei once sought to become her apprentice; she later treated him and remains involved in efforts to address his bloodline disease. Rei is also her creditor. 66 68 69
• Uchiha Rekka — Former opponent who became Rei's loyal informant and subordinate. Rei gave him a chakra-resonant ring that transforms into a katana and can signal Rei when activated. 8 27
• Uchiha Itachi / Kohinata Suzaku — Initially Rei's rival, later sealed, reincarnated, renamed, and made into a devoted subordinate. 13 14 199 312
• Uchiha Sasuke — Rei protected Sasuke from Root and Uchiha clan members when both factions attempted to take him. 25
• Otsutsuki Toneri / Hyuga Toneri — Rei's son. Toneri cares for Rei during his illness, assists him in travel, and regards him as a father and teacher. 176 188 237
• Hyuga Suzu — Rei's wife and Toneri's mother; an Otsutsuki descendant who offered five pairs of ancestral Byakugan as her dowry. 291 293
• Ryuzetsu — Rei II's close companion within the Box of Ultimate Bliss. She revived Rei through the Reincarnation Technique, collapsing afterward. 158 166
• Uchiha One — A girl created from Rei's genes by Orochimaru. She possesses chakra and genjutsu similar to Rei's and claims she was born for him. 199 201 242
• Kabuto Yakushi, Kurama Yakumo, and Uchiha Izumi — Members of Team Rei, specializing respectively in Medical Ninjutsu, Genjutsu, and Taijutsu/Fire Release. 83
• Samui and Mabui — Land of Lightning kunoichi who became Rei's allies and openly confessed their feelings for him. 117 301
• Uchiha Ten — Rei's deceased older brother, a prodigy said to have surpassed Shisui in talent. His death and Shisui's failure to save him continue to influence Rei's actions. 241 260
• Might Guy — Academy competitor and later training partner; Guy remains openly supportive despite Rei's disability. 68 227

Story Role / Major Arcs

Uchiha Clan Conflict

Rei identifies the hidden forces manipulating the Uchiha crisis, defeats Rekka, opposes Root's attempt to seize Sasuke, and infiltrates the Uchiha clan compound in search of its secrets. 3 14 25

Battles against Itachi and Obito

Rei overwhelms Itachi in a clash of Mangekyō techniques, then provokes and battles Obito while deliberately restraining his own strength to prevent Obito from escaping through Kamui. 13 14 46 47

Hōzuki Castle and the Box of Ultimate Bliss

Rei and his Phantom Clones confront Akatsuki operatives, seal Yugito Nii, explore the Little Hyuga Clan's hidden temple, and enter the Box of Ultimate Bliss. Rei II remains inside for ten years, develops the Phantom Cursed Seal, and forms a bond with Ryuzetsu and the Two-Tails. 120 132 158

Bloodline Disease and Resurrection

Rei's excessive Yin Chakra develops into a debilitating Kekkei Genkai Disease that weakens him, limits his mobility, and threatens his life. Rei II self-destructs against the black monster, while Ryuzetsu sacrifices herself to revive the original Rei. 75 166 176

Return to Konoha

Presumed dead, Rei returns to Konoha in a wheelchair, exposes Danzō's attempt to use his name to start a war against the Land of Grass, and helps halt the conflict. 214 225

Konoha's Political Center

Rei becomes one of Konoha's most influential figures despite his physical condition. Both Hiruzen Sarutobi and Danzō publicly support the possibility of Rei becoming Hokage, while major clans treat him as a dangerous political power. 239 283

Land of Lightning Conflict

Rei resolves a crisis with the Land of Lightning by defeating its agents, locating the missing envoy, and preventing war. He later uses the Hashirama Pill and Seven Stars Ninjutsu to defeat ten thousand enemies alone. 301 302 322

Notable Quotes

“In the Ninja World, unless you are Chakra, it is impossible for everyone to like you.” 193

“Every training session never deceived myself.” 25

Trivia

• Rei donates most of his mission rewards to the Konoha Orphanage and funds for fallen ninja, despite becoming one of Konoha's wealthiest Jonin. 78 329
• His nickname, “Konoha's Grass,” is widely known even outside the Land of Fire. 112 117
• Rei's many admirers in Konoha consider him the village's foremost marriage candidate. 293
• Although he regularly uses a wheelchair, Rei can temporarily force himself to walk through reality-altering genjutsu at the cost of his lifespan. 176 193