Seiji

Biodata

Feature	Information
Name	Seiji (清司) / Ōtsutsuki Seiji
Alias(es)	Bone; “Celestial Being”
Species/Race	Ōtsutsuki descendant; formerly identified with the Kaguya Clan
Gender	Male
Affiliation	Kirigakure; Kirigakure Anbu; Seven Ninja Swordsmen of the Mist
Occupation/Role	Fourth Mizukage; former captain of Anbu First Division and Team Six
Status	Alive
First Appearance	1

Power Progression

Stage / Realm / Level	Chapter	Notes
Chūnin-level combat power	5	At age eight, prolonged Shikotsumyaku and chakra training raised him to elite Chūnin-level chakra reserves and roughly Chūnin-level combat ability.
Jōnin-level	12 16	Integrated Isshiki’s memories and battle experience, gaining jōnin-level combat power before joining Kirigakure.
Elite jōnin-level	31	Reached elite jōnin level after five years of missions; Team Six maintained a 100% completion rate under his leadership.
Kage-level	79	Growth near the juvenile Ten-Tails raised his strength to Kage level; his chakra reserves were listed at 0.48 Hashirama.
Enhanced Kage-level	162	Absorbing higher-quality Small Ten-Tails chakra increased his reserves to 0.76 Hashirama and strengthened his Jōgan.
Tenseigan Chakra Mode / Fetal Movement	193 194	Awakened the Tenseigan and began assimilating the Giant Tenseigan’s power; gained Tenseigan Chakra Mode and degraded Truth-Seeking Balls.
Six Paths-level	284	The Tenseigan completed its third Fetal Movement and matured, granting Six Paths-level strength and surpassing Hamura by Seiji’s assessment.
Kekkei Mōra wielder	512	After consuming God Tree chakra, Takamagahara’s space-time function evolved into Yomotsu Hirasaka; he also gained Kamimusubi.
Six Paths-level limit / transformation	636	Began a transformation using nine Chakra Fruits; his body and soul formed a mutually reinforcing balance.

Background / History

Seiji was born to Kaguya Genji and Kaguya Yukiko. His horns, an expression of his reverted Ōtsutsuki bloodline, led Kaguya Musashi to reject him as a Kaguya clansman and exile the family to an isolated settlement in the Land of Water. Yukiko died when Seiji was three, while Genji remained his protector and teacher. 1

At eight, Seiji awakened memories of a previous life and recognized that his horned appearance signified a nascent Ōtsutsuki bloodline. Soon afterward, he awakened Shikotsumyaku and trained in secret. 1 3 5

Jigen, controlled by Ōtsutsuki Isshiki, pursued Seiji as a potential vessel. Genji sacrificed himself using the Ash Bone Technique to severely injure Isshiki and give Seiji a chance to escape. Seiji survived by deceiving Isshiki with a Shadow Clone, then inherited the ownerless Karma’s information, memories, and abilities after Isshiki’s death. 7 9 10

After becoming lost outside the exiled settlement, Seiji was taken in by Elder Genshi, a former associate of Genji. He adopted the Ōtsutsuki surname, joined Kirigakure, and became Genshi’s adopted grandson. 16

Seiji rose through the Anbu, leading Team Six alongside Chino and Yagura before becoming captain of the Anbu First Division. His leadership, strength, and status as Genshi’s grandson positioned him as a prospective Mizukage. 31 163

He later became the Fourth Mizukage, directed Kirigakure’s reforms, and guided several younger shinobi, including Mei Terumi. 234

A clash with Urashiki caused Seiji to be cast through space-time into the Ninja World a thousand years in the past. “Omnipotence” erased his memories of the Shinobi World, leaving only his name and memories of Blue Star. During this era, he unified nearby settlements and founded a country; his memories eventually returned after encountering Urashiki again. 248 317 324

Appearance

Seiji is a tall, fair-skinned man with refined facial features, white-gray hair that later becomes long, pure white hair after his Tenseigan matures, and two horns on the front of his forehead. 1 284

• Two forehead horns identify his orthodox Ōtsutsuki bloodline. 11
• He originally concealed his horns and clan markings with the Transformation Technique. 12
• After reaching Six Paths level, he manifests a white chakra robe patterned with black tomoe. 284
• His Tenseigan emits a sky-blue, star-like radiance. 467

Personality

Seiji is analytical, strategic, and highly pragmatic. He assesses enemies’ strengths and motives, prioritizes decisive targets in battle, and uses reconnaissance before committing to an operation. 43 142 305

Though initially shaped by Isshiki’s memories and an increasingly detached, godlike disposition, Seiji consciously regards himself as human rather than a god. He values the family he found with Genshi and is protective of comrades under his command. 12 73 515

His pragmatism can be ruthless: he killed Kira Uchiha to acquire a Mangekyō Sharingan, controlled Toneri to obtain information, and sealed Hamura to prevent interference. 209 438 439

Abilities & Skills

Ōtsutsuki Physiology

Seiji’s reverted bloodline grants him exceptional chakra talent, physical resilience, rapid recovery, and affinity for all seven chakra natures. 5 10

• Possesses Wind, Lightning, Water, Fire, Earth, Yin, and Yang chakra natures. 79
• His bloodline gradually assimilated Isshiki’s ownerless Karma and information. 10
• He can communicate with the Small Ten-Tails through chakra. 79

Shikotsumyaku

Seiji can manipulate his bones into weapons and defenses, a Kekkei Genkai inherited through the Kaguya bloodline. 3 5

• Ten Finger Drilling Bullets — Fires controllable bone bullets individually or in rapid succession. 5 17
• Dance of the Clematis: Vine / Flower — Uses his spinal bone as a whip or drill for mobility and piercing attacks. 70
• Dance of the Seedling Fern — Creates widespread bone spikes from the ground. 130
• Ash Bone Technique — Can reduce a target to ash; Genji used it to cripple Isshiki, while Seiji used it to dispose of Kira Uchiha’s body. 9 209

Jōgan

Seiji’s Jōgan is a dōjutsu derived from his Ōtsutsuki bloodline and enhanced by Ten-Tails chakra. 77 162

• Sees through objects, hidden structures, chakra colors, and space-time phenomena. 77
• Allows detailed sensory perception of life force, chakra intensity, movement, and condition across an area. 142
• Can analyze and replicate observed techniques, including Mei Terumi’s Lava Release. 48
• Counters space-time techniques such as Urashiki’s Yomotsu Hirasaka by perceiving through space-time. 213

Takamagahara and Space-Time Techniques

Takamagahara is Seiji’s original space-time dōjutsu, later partly evolved into Yomotsu Hirasaka. 512

• Travels to his personal Ōtsutsuki dimension and accesses stored objects. 5 509
• Creates isolated storage space for rapid access to Hiramekari. 509
• Enables infiltration and teleportation across long distances. 201
• Its space-time function evolved into Yomotsu Hirasaka after Seiji consumed God Tree chakra. 512

Sukuna Hikona and Daikokuten

Seiji inherited Isshiki’s dōjutsu through Karma. 77

• Sukuna Hikona — Shrinks himself or objects and restores them to normal size. 77 180
• Daikokuten — Accesses stored items and objects through a dedicated space. 77 509
• He considers their activation speed and repeated use inferior to Isshiki’s. 509

Tenseigan

Seiji awakened a Tenseigan stronger than Hamura’s, comparable to a Tomoe Rinnegan. 193

• Tenseigan Chakra Mode — Envelops him in blue-green chakra flames and dramatically increases his power. 193
• Almighty Push — Repels opponents with overwhelming force. 305 467
• Heavenly Obstacle Shaking Star — Summons meteorites; Seiji used five against Mouryou’s ghost legion. 286
• Spirit Ball — Controls a target’s will and actions while extracting their thoughts. 438
• Its three Fetal Movements culminated in Six Paths-level strength. 193 284

Truth-Seeking Balls

Seiji learned to form and control Truth-Seeking Balls through Hamura’s method. 202

• Created three true Truth-Seeking Balls after three days of practice. 202
• They offer near-impenetrable defense against attacks below Six Paths level. 202
• Before full mastery, Tenseigan Chakra Mode produced weaker “degraded” versions that could exceed nine in number. 194

Sage Arts and Elemental Releases

Seiji combines Ōtsutsuki chakra with natural energy to use Six Paths Sage Mode. 214

• Sage Art: Ice Release: Eternal Frozen Domain — Freezes Madara’s Susanoo and Tree World. 360
• Uses Lava and Boil Release in battle against Madara. 458
• Can employ Water, Earth, Wind, Lightning, Fire, and Yin-Yang Release techniques. 79 360

Kekkei Mōra

After obtaining God Tree chakra, Seiji developed two Kekkei Mōra techniques. 512

• Yomotsu Hirasaka — Advanced space-time movement evolved from Takamagahara. 512
• Kamimusubi — Amplifies the power of his attacks by up to ten times. 512
• Amenotokotachi — Creates a time domain approaching absolute stillness; opponents without equivalent time-based powers or immediate Kekkei Mōra resistance are unable to evade his attacks. 594

Equipment / Weapons / Items

• Twin Swords Hiramekari — Summoned and chakra-augmented for crescent-blade attacks. 70
• Samehada — Used to replenish chakra during the battle against the Six-Tails. 73
• Truth-Seeking Balls — Versatile offensive and defensive Yin-Yang Release constructs. 202
• Yin-Yang Release Black Rods — Inherited through Isshiki’s legacy and used in combat. 79 466
• Great Coffin of the Heavens — A Yin-Yang Release defensive construct; used with Rashomon against Golden Wheel Reincarnation Explosion. 79 180
• Mizukage’s Divine Robe — Worn during his tenure as Mizukage. 284 441

Relationships

• Kaguya Genji — Father; protected Seiji from Isshiki and died using the Ash Bone Technique to save him. 7 9
• Kaguya Yukiko — Mother; died during Seiji’s childhood after the family’s exile. 1
• Genshi — Adoptive grandfather and mentor; offered Seiji a home in Kirigakure and intended to prepare him for the Mizukage position. 16 17
• Yagura — Adoptive younger brother, teammate, and later Mizukage assistant; Seiji trusts him with administration. 31 188 234
• Chino — Longtime teammate in Team Six and the Hidden Mist Three Stars. 31 142
• Mei Terumi — Student and ally; Seiji guides her development as the Six-Tails jinchūriki. 234 458
• Ōtsutsuki Isshiki — Former pursuer and would-be possessor; Seiji inherited and assimilated Isshiki’s Karma, memories, and abilities after his death. 9 10
• Ōtsutsuki Hamura — Ancestor and teacher whose guidance enabled Seiji’s Tenseigan, Truth-Seeking Balls, and later development. 155 202
• Kaguya Ōtsutsuki — Seiji considers her his mother and resents Hagoromo for sealing her. 377
• Ōtsutsuki Urashiki — Major Ōtsutsuki adversary whose encounter helped Seiji recover his lost memories. 293 324
• Toneri Ōtsutsuki — Seiji controlled him for information, then released him and left a Wood Release Clone to educate him. 438 439

Story Role / Major Arcs

Early Life and Isshiki’s Pursuit

Seiji’s childhood exile ends in tragedy when Isshiki targets him as a vessel. Genji’s sacrifice leaves Seiji alone but allows him to survive, obtain Isshiki’s legacy, and begin pursuing strength. 1 7 9 10

Kirigakure Anbu

Genshi brings Seiji to Kirigakure, where Seiji joins the Anbu, forms Team Six with Chino and Yagura, and becomes a respected captain through difficult missions and decisive leadership. 16 31 163

Six-Tails Incident

Seiji fights the complete Six-Tails to protect the Seven Ninja Swordsmen, relying on Shikotsumyaku, Hiramekari, Samehada, Rashomon, and Water Release. The aftermath stimulates his bloodline and leads to the Jōgan’s awakening. 69 70 72 73 75 77

Moon and Tenseigan Arc

Seiji discovers Hamura’s Moon pathway, battles Ōtsutsuki Hiraishiki, gains access to the Giant Tenseigan, and begins the three-stage maturation of his Tenseigan. 155 180 188 193

Fourth Mizukage

As Fourth Mizukage, Seiji reforms Kirigakure, delegates administration to Yagura, trains Mei Terumi, and strengthens the village’s elite forces. 217 234

Ōtsutsuki Conflicts

Seiji confronts Isshiki, Urashiki, Madara, and other powerful opponents while developing Six Paths Sage Mode, Kekkei Mōra, and plans involving the Small Ten-Tails and God Tree. 213 214 293 360 466 512

Time Displacement

Following a space-time explosion involving Urashiki, Seiji is thrown a thousand years into the past with his memories sealed. He establishes a country before recovering his identity through a later encounter with Urashiki. 248 317 324

Trivia

• Seiji was born on February 10 in Kirigakure Year 19. 79
• At age sixteen, he was listed at 183 cm and 78 kg; at seventeen, he was 183.2 cm and 80.5 kg. 79 162
• He refuses to use Samehada’s full transformed power because he considers its appearance too ugly. 73
• He used Shikotsumyaku to turn his spine into a whip for dragging a giant bear while traveling. 10