Tsukasa Hatayama

Biodata

Feature	Value
Name	Tsukasa Hatayama (鸠山司)
Alias(es)	“Jujutsu Professor,” an unofficial title earned through his technical innovations 17
Gender	Male
Age	15 in his status panels; the opening chapter describes him as sixteen 1 2 17
Affiliation	Hatayama family; Tokyo Metropolitan Jujutsu High 1
Occupation/Role	Jujutsu High student, Special Grade sorcerer, technique inventor, and mentor to fellow students 1 8 30 48
Rank	Special Grade upon enrollment; subsequently recognized as Jujutsu Society’s strongest sorcerer 1 26 36
Status	Alive; possesses Hōgyoku-granted immortality of body and soul 2 50
First Appearance	Chapter 1, “The System Is Gone Right from the Start?” 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Special Grade before formal training	1 2	Receives the rank after effortlessly exorcising a Special Grade curse threatening his mother. Already possesses Dark Manipulation, Orochi’s Void, Mystic Eyes of Death Perception, and the Perfect Hōgyoku.
Black Flash demonstrated	6	Claims to learn it after watching Gojo perform it, then uses a matching strike during their duel.
Reverse Cursed Technique acquired	9	Grasps positive-energy production with the Hōgyoku’s help. Initially can heal others but cannot use the technique on himself.
Dark Gravity and incarnation extraction developed	11 12	A month of research unlocks limited gravity control, flight, and the ability to extract incarnated beings from human hosts.
Orochi’s Void first used publicly	15	Activates Moment of the Gods’ Descent and destroys a shrine curse with void-infused attacks and One-Handed Universal Radiance.
Physical strength reaches Toji’s approximate level	16	Awakens from a fifteen-day sleep with a substantially stronger body.
Greater reserves and reduced sleep penalty	17	The Hōgyoku increases his physical potential and cursed energy; the recorded unconscious period falls from fifteen and a half days to fourteen.
Refined swordsmanship and sword intent	22 23	Demonstrates an extensive sword repertoire, cuts a boulder into nine pieces with a wooden sword, and produces slashes without cursed energy.
Positive–negative energy Rasenshuriken	23	Combines ordinary cursed energy with Reverse Cursed Technique’s positive energy; the demonstration leaves a deep crater.
Adaptation to Heart Pacemaker	24	Revives after the Heart God shatters his heart. Hōgyoku-driven evolution prevents the domain from reaching inside him again.
Two Maximum Techniques developed	28	Reveals Rational Universe and Living Sacrifice: Divine Grace Redemption.
Second trait of Dark Manipulation revealed	29	Demonstrates violet flames that inflict searing pain on souls, supporting his explanation that his technique has two traits.
Advanced biological reconstruction	41	Combines a copied bodily model, Riko Amanai’s blood, and highly precise Reverse Cursed Technique to create a replacement Star Plasma Vessel.
Adaptation to Kenjaku’s gravity	44	Evolves under crushing gravity until the technique no longer impedes his movements.
Cursed-technique nullification incorporated	46	Extracts the Inverted Spear of Heaven’s special cursed energy into Dark Manipulation. A resulting Black Rod penetrates and nullifies Gojo’s Inviolability.
First domain mastered	48	Confirms that he developed a domain during the preceding year, by August 10, 2007. Its name and effects are not specified in the supplied passages.
Second domain under development	49	Confirms that he is investigating a second domain associated with another stretch of darkness in his innate domain; mastery is not yet established.

Background / History

Tsukasa belongs to the wealthy Hatayama family, which has produced influential statesmen for generations. He grows up at Hatayama Manor with his affectionate mother, Mirei, his more discipline-minded father, Tsuki, and household servants. His upbringing emphasizes etiquette and responsibility, even though his mother offers to buy out his school rather than let him live away from home 1 18.

He retains memories of a previous life and recognizes his surroundings as the world of Jujutsu Kaisen. Having read the manga, he knows major future tragedies and the threats posed by Kenjaku and Sukuna. A one-use system grants him supernatural eyes, a Hōgyoku fused with his body, and Orochi’s abilities before disappearing; his personal status panel remains available 1 2.

He enters Jujutsu High alongside Satoru Gojo, Suguru Geto, and Shoko Ieiri at the beginning of Gojo and Geto’s school years, thirteen years before the main storyline. Although already Special Grade, he initially lacks formal jujutsu education and conceals his foreknowledge behind apparent inexperience 1 2.

Alongside sorcery, Tsukasa pursues ordinary academic goals. He studies for the University of Tokyo to please his mother and obtain a degree that will help him inherit the family business, allowing his father to retire. His Special Grade standing secures an early entrance-examination opportunity while he is still a second-year; the supplied context does not establish the result 28 35 37.

Appearance

Tsukasa is a handsome, pale teenager with a tall, slender frame and an aristocratic bearing; his initial appearance is explicitly compared to Raizel 1 21.

• Hair and eyes: Black hair and crimson eyes in his ordinary appearance 1 15.
• Physique: Well-defined muscles despite a non-bulky build; his classmates consider his physique the best among the three male friends 22 49.
• Left-ear accessory: A cross earring whose gem glows red when he releases powerful cursed energy 6.
• Activated mystic eyes: His eyes display multicolored spirals, while Geto sees dense red lines when examining them 6 7.
• Orochi transformation: Snow-white hair, black markings across his exposed upper body, levitation, and an ambiguously gendered voice. His cross earring remains unchanged 15.

Personality

Tsukasa is reserved and courteous rather than ostentatious. He greets seniors respectfully regardless of their rank, observes formal etiquette even around higher-ups he dislikes, and avoids disturbing others unnecessarily. Shoko describes him as dignified and seemingly dull, but sensitive and polite 8 18 20 21.

His generosity is usually practical: personalized snacks, remembered favorite foods, birthday presents, healing, and instruction. He comforts Geto after defeating him and deliberately lets younger students handle manageable threats instead of taking every fight for himself 7 12 13 21 30 31.

Despite his composure in battle, he is inexperienced with romance and easily flustered by Mei Mei’s teasing. He also has a sharp, mischievous side: he trades cutting remarks with Gojo, invents an “ancient book” to disguise his foreknowledge, and enjoys overturning his friends’ confidence after they gang up on him 3 22 37 50.

His devotion to his mother is a conspicuous vulnerability. Gojo’s attempt to provoke him with “Mama’s boy” succeeds immediately and earns Gojo a beating 9.

Protecting loved ones matters more to him than institutional reform. He considers Jujutsu Society too deeply corrupt to fix by merely replacing its leaders, choosing instead to strengthen himself and safeguard his family and friends. That loyalty also permits ruthless violence: he retaliates against Toji for maiming Geto and executes the Time Vessel Association’s members after Riko’s rescue 19 40 42.

Abilities & Skills

Dark Manipulation

His innate cursed technique creates and reshapes dark matter according to his imagination. Its applications expand from weapons and defenses to gravity, soul extraction, biological copying, and acquired cursed-tool properties 3 12 41 46.

• Dark Treasure: Opens black rings in the sky that bombard a target with weapons 6.
• Barriers and constructs: Produces defensive barriers, lifting platforms, blades, and guards. Before a prolonged sleep, he surrounds Hatayama Manor with a spatial barrier and technique-created defenses 6 12 16 23.
• Mist transformation: Escapes Geto’s swallowing curse by becoming mist and leaving through its breath 7.
• Dark Gravity: Controls gravity to avoid traps, crush a Grade 1 curse, and fly. Its early development is limited; he cannot yet pull down meteorites 11 12.
• Sealing spheres: Imprisons curses inside portable dark-matter spheres. The storage space is described as unaffected by Tengen’s barrier 11.
• Incarnation extraction: Forcibly removes incarnated beings or souls from human hosts. A host may survive if extraction occurs early enough 12 46.
• Protective and copying Black Orbs: Supplies orbs that protect Riko and Kuroi; one also records Riko’s genes and body shape for a replacement vessel 35 40 41.
• Kon: Summons a huge black fox head that instantly destroys a Grade 1 rat curse 31.
• Cursed-tool property extraction: Absorbs the Inverted Spear of Heaven’s nullification property and reproduces it through a Black Rod 46.

Violet Flame and Maximum Techniques

Tsukasa attributes Dark Manipulation’s two Maximum Techniques to its apparent possession of two traits. His violet flames demonstrate an additional soul-affecting power 28 29.

• Violet Flame: Causes searing pain to nearby souls and can be shaped into a bow-and-arrow attack 29.
• Maximum Technique: Rational Universe: Engulfs an opponent in a black hole, then introduces white lightning that turns it into a universe-like space and detonates it. The narration specifies soul-targeting damage; Kenjaku’s host body is nowhere to be found afterward 44.
• Living Sacrifice: Divine Grace Redemption: Identified as his second, advanced Maximum Technique. Its mechanics are not explained in the supplied context 28.

Orochi’s Void

Orochi’s Void is not his innate technique. The vanished system engraves the power of Orochi from The King of Fighters into his body as a cursed technique 2.

• Moment of the Gods’ Descent: Transforms his appearance and releases an immense surge of cursed energy 15.
• Void-infused strikes: A red crescent generated by his kick slices a powerful shrine curse into pieces 15.
• One-Handed Universal Radiance: Floods the mountainside with white light and annihilates the curse’s remains 15.
• Broader functions: Described as encompassing space and black-hole manipulation, teleportation, annihilating light, gravity, soul control, and cursed-energy pillars 15.
• Recurring drawback: Forces him into prolonged deep sleep roughly every other month. The Hōgyoku gradually reduces the duration, but the condition still requires extended absences and defensive preparations 2 16 17.

Mystic Eyes of Death Perception

These eyes reveal the “Death of All Things”: weaknesses that Tsukasa can cut, including those of techniques and seemingly absolute defenses 6.

• Cuts apart Gojo’s Blue with a knife 6.
• Severs Limitless’s defense, allowing his following punch to connect 6.
• Makes a close-range knife particularly practical for his fighting style, even after he acquires Kitetsu 19.

Perfect Hōgyoku

The Hōgyoku is fused with Tsukasa’s body and has no independent consciousness. It sustains his growth, regeneration, and immortality 1 2.

• Immortality: Makes his body and soul undying and indestructible 2.
• Continuous strengthening: Improves his body beyond its previous limits without requiring physical conditioning for the initial gains 7 16 17.
• Energy replenishment: Refines cursed energy continuously and periodically adds reserves described as equivalent to those of a hundred Grade 1 sorcerers 31.
• Adaptive evolution: Grants resistance after the Heart God destroys his heart and later renders Kenjaku’s gravity ineffective against him 24 44.
• Learning assistance: Helps him grasp Reverse Cursed Technique and develop abilities inspired by manga 9 14.
• Drawback mitigation: Gradually shortens Orochi’s Void’s forced sleep 17.

His panel initially measures his cursed energy against “one Nine-Tails,” while later passages use inconsistent one/half-Nine-Tails wording. The clearer documented development is that his reserves continue to increase 2 17 31.

Cursed Pressure and Energy-Based Attacks

Tsukasa develops methods of attacking without relying on an innate cursed technique, contributing to his reputation as the “Jujutsu Professor” 6 17 18.

• Cursed Pressure: Compresses cursed energy before releasing it as an offensive surge. Effectiveness depends on cursed-energy reserves and mental strength; Gojo’s active Limitless initially blocks it 6 8.
• Rasengan: Adapts the manga technique into a cursed-energy attack and teaches it to his friends 14 17 47.
• Rasenshuriken: Combines negative cursed energy with positive energy, producing a powerful explosive projectile 23.
• Black Flash: Demonstrates it against Gojo and later uses it to launch the Heart God into Mei Mei’s crow attack 6 25.
• Other panel-listed abilities: Slash, Rozan Rising Dragon, Rozan Hundred Dragons, and Heavenly Devour are identified as Hōgyoku originals; their functions are not detailed in the supplied passages 2.

Reverse Cursed Technique

Tsukasa produces positive energy by multiplying negative cursed energy. His early mastery allows treatment of others but explicitly excludes self-healing, which he associates with the Hōgyoku already providing regeneration 9.

• Heals injured children, curse erosion, Haibara, and Nanami 31 32.
• Restores Geto’s missing right arm 40.
• Channels positive energy through Kitetsu during the Heart God battle 24.
• Multiplies a drop of Riko’s blood and uses it with a copied bodily model to create a replacement Star Plasma Vessel 41.
• Is later described as resisting the Heart God’s heart attack with Reverse Cursed Technique; the context does not explicitly explain whether his original self-healing restriction has changed 25.

Close Combat and Swordsmanship

His initial panel lists ancient close-quarters combat and knife use at “transcendent mastery.” Yaga later considers him the strongest hand-to-hand fighter among his three male students 2 22.

• Sword intent: Produces cutting force distinct from cursed energy, allowing even a wooden sword to cut stone and a dark-matter blade to launch sword energy 22 23.
• Kuzuryūsen: Cuts a boulder into nine pieces with speed that astonishes even Gojo’s Six Eyes 22 23.
• Named repertoire: Includes Dragon Nest Flash, Dragon Nest Flash: Bite, Earth Dragon Flash, Dragon Coil Flash, Dragon Hammer Flash, Dragon Soar Flash, Dragon Roar Flash, Drawn Dual Dragon Flash, and Drawn Flying Dragon Flash 22.
• Bone-Breaking Tendon-Splitting Hand: Breaks Kenjaku’s hands to prevent domain hand signs 44.
• Predictive Mind’s Eye: Detects air currents around the human body to anticipate and evade attacks; Tsukasa teaches it to Gojo and Geto 47.

He describes sword intent as having three stages—unranked, Steel-Cutting Swordmaster, and Great Swordmaster—but the supplied passages do not explicitly assign him one of those ranks 23.

Domain Development

Tsukasa masters one domain during the year leading up to August 10, 2007, then begins comprehending a second 48 49.

• His innate domain contains two stretches of endless darkness with different qualities 49.
• One feels sinister and destructive; the other is eerily quiet, visible but beyond his grasp 49.
• The supplied passages do not establish either domain’s name, rules, or sure-hit effect 48 49 50.

Teaching and Technique Design

Tsukasa shares techniques while tailoring instruction to the learner and limiting knowledge he considers politically destabilizing 9 23 48.

• Uses water-walking and tree-climbing exercises inspired by Naruto to teach precise cursed-energy control 9.
• Gives Gojo Flowing Water Rock Smashing Fist and Geto Whirlwind Iron-Cutting Fist, designing the styles to work together 46 47.
• Supplies Yaga with Shave, Finger Pistol, and Iron Body, withholding the other three Six Powers to avoid disrupting Jujutsu Society 48.
• Coaches first-years on Curtains, emotional discipline, curse assessment, sensory control, and accurate mission reporting 30 31 32.

Equipment / Weapons / Items

• Perfect Hōgyoku — Fused into his body; the source of immortality, adaptive evolution, regeneration, and continuing growth 2 24 44.
• Knife — His preferred close-range implement for cutting the weaknesses exposed by his Mystic Eyes 6 19.
• First Kitetsu / Demon Blade Kitetsu — A Special Grade cursed tool awarded by the higher-ups. It can kill shikigami in one strike and forcibly destroy barriers, but consumes cursed energy and drains the vitality of insufficiently powerful wielders 18.
• Black Rod — A dark-matter weapon imbued with the Inverted Spear of Heaven’s extracted nullification property; successfully bypasses Gojo’s Inviolability 46.
• Inverted Spear of Heaven — Borrowed from Gojo for research rather than established as Tsukasa’s permanent possession 45 46.
• Blue jade pendant — A Hatayama family heirloom given to Mei Mei at her graduation as a token of affection 27.
• Personal status panel — A private, red, tablet-like display tracking his techniques, abilities, energy, and condition after the system’s departure 2 17.

Relationships

• Mirei Hatayama — His doting mother and a central emotional priority. Her lessons shape his manners, and she worries deeply during his prolonged sleeps 1 6 16 21.
• Tsuki Hatayama — His father, who advocates discipline over shortcuts. Tsukasa plans to inherit the family business so Tsuki can retire 1 37.
• Suguru Geto — One of his two closest friends and a frequent pupil. Tsukasa supports his confidence, heals his severed arm, and saves Riko partly to avert Geto’s original descent into darkness 3 7 40 42 47.
• Satoru Gojo — Closest friend, rival, and student. Tsukasa’s victory motivates Gojo to improve; their friendship combines teasing, jealousy, technique exchanges, and sincere support 6 8 26 46.
• Shoko Ieiri — Classmate and fellow healer. Tsukasa makes an effort to include her in the group, while she supports his standing as the strongest student and observes his experiments 23 28 46.
• Mei Mei — Senior, regular mission partner, and developing romantic interest. Their bond progresses from paid exorcism work to personal gifts, flirtation, and a hand-holding shopping date; no formal relationship is confirmed 10 21 27 32 35.
• Masamichi Yaga — Teacher and protective mentor who later becomes principal. Yaga trusts Tsukasa’s judgment, while Tsukasa shares training methods and helps shield him and Panda from political interference 17 45 47 48.
• Panda — Yaga’s unusual cursed corpse, whom Tsukasa treats affectionately and helps protect by backing Yaga 17 48.
• Kento Nanami and Yu Haibara — Junior students he supervises in the field. He gives them room to gain experience, intervenes against an unexpectedly strong curse, and heals them afterward 30 31 32.
• Riko Amanai and Kuroi — Protected through his Black Orbs and rescue efforts. He creates a substitute vessel so Riko can escape assimilation 40 41 42.
• Toji Fushiguro — Enemy during the Star Plasma Vessel incident. Tsukasa overwhelms him and tears off his right arm in retaliation for Geto’s injury 40.
• Kenjaku / Kaori Itadori — Hostile, body-stealing curse user obsessed with possessing Tsukasa. Tsukasa exposes the possession, defeats the host in battle, and warns Yaga about the surviving threat 43 44 45 47.

Story Role / Major Arcs

Enrollment and the “Jujutsu Professor” Reputation

Tsukasa’s arrival disrupts Gojo and Geto’s confidence in their own superiority. Yaga deliberately pits them against him to teach humility; Tsukasa defeats both, then turns their losses into opportunities for instruction 6 7 8.

A curse outbreak forces his deployment before the normal six-month training period ends. Partnered with Mei Mei, he clears numerous missions and helps reduce casualties. His new attack methods attract attention beyond the school, earning his unofficial title and prompting Yaga to warn him about exploitation 10 11 16 17.

Recognition and Political Pressure

The higher-ups reward Tsukasa with Kitetsu and money. His attempt to feed the sword overwhelms their meeting room, but he protects the elders and apologizes. He accepts one billion yen from a two-billion-yen offer without committing himself to their politics 18 19 20.

At Gojo’s birthday gathering, guests’ covetous interest provokes the three friends into jointly using Cursed Pressure. Tsukasa demands respect for his Special Grade standing, then apologizes privately to Gojo’s father for disrupting the event 26.

Mentorship and the Star Plasma Vessel Incident

As a senior, Tsukasa supervises Nanami and Haibara on a kindergarten mission that proves more dangerous than its Grade 3 classification. He leaves the weaker enemies to them, destroys the concealed Grade 1 curse, and heals the survivors 30 31 32.

Recognizing the approach of the Hidden Inventory events, he initially prioritizes his university entrance exams but supplies Gojo and Geto with protective Black Orbs. He later intervenes against Toji, restores Geto’s arm, and creates a replacement Star Plasma Vessel rather than sacrifice Riko 34 35 37 40 41.

He conceals Riko’s survival from Yaga and volunteers to punish the Time Vessel Association. That evening, he kills Shigeru Sonoda and ninety-nine other members, committing himself to protecting his loved ones’ futures 42.

Kenjaku’s Fixation and Continued Development

Kenjaku approaches him in Kaori Itadori’s body, seeking to possess his exceptional physique and abilities. Tsukasa exposes the takeover, adapts to the host’s gravity technique, and unleashes Rational Universe. He suspects an escape through spatial teleportation; Kaori’s subsequent appearance confirms that the enemy remains active 43 44 47.

Tsukasa then incorporates cursed-technique nullification into Dark Manipulation and distributes complementary martial arts and selected Six Powers to strengthen his allies. By August 2007, he has mastered one domain and is investigating a second, while the three strongest students’ backing helps protect Yaga and the school from outside pressure 46 47 48 49.

Notable Quotes

“This has nothing to do with grades. I admire and respect you from the bottom of my heart.”
— To Mei Mei 11

“There's no need, sir. I have faith in my strength. Besides, what kind of student hides behind his teacher?”
— Accepting early deployment 10

“Satoru is growing, but so am I. There's already a subtle gulf between us, and it will only widen with time.”
— On his continuing rivalry with Gojo 48

Trivia

• His aristocratic appearance contrasts with his SpongeBob SquarePants underwear, exposed during his classmates’ teasing 49.
• He requests especially bitter coffee and also drinks bitter jasmine tea 47 48 50.
• Although the school’s first-years keep calling him “senpai,” he asks to be addressed as “upperclassman Hatayama”; the term reminds him of being guided by Mei Mei 30.
• He considers eventually giving Kitetsu to Yuta Okkotsu, but no transfer occurs in the supplied context 19.