Yuki Tsukumo — Jujutsu Kaisen

Yuki arrives near the end of the Shibuya Incident as Uraume’s ice threatens several sorcerers. Her shikigami intervenes, and she confronts the figure using Suguru Geto’s body. In their exchange, Yuki argues that humanity should move beyond cursed energy; Kenjaku instead pursues its radical transformation and exploitation. Their disagreement is not merely about how to fight curses but about what sort of future should exist for human beings.

After Shibuya, Yuki joins other sorcerers seeking information from Tengen. She and Choso agree to stay behind as Tengen’s guards while the others act against the Culling Game. The arrangement also gives Yuki an opportunity to question Tengen, whose past she knows is bound up with the Star Plasma Vessels.

Yuki reveals that she herself was once a Star Plasma Vessel. She confronts Tengen over the young women who were expected to merge with them, rejecting their detached account of the sacrifices involved. Yuki can hear the voices of earlier vessels within Tengen, but refuses to pass on their words and give Tengen an easy escape from responsibility. Her history makes her objections personal, not simply theoretical.

When Kenjaku breaks into the Tombs of the Star Corridor, Choso first fights him to expose more of his abilities. Yuki then joins the battle. Her innate cursed technique, Star Rage (Bom Ba Ye), adds virtual mass to her own body and to her shikigami, Garuda. She can strike with devastating impact without proportionately slowing herself; Garuda can also be wielded as a heavy projectile or used to restrain an opponent. The technique does not simply make her body invulnerable to every kind of damage.

Yuki can use Reverse Cursed Technique to heal herself and Simple Domain to resist a domain’s guaranteed hit. She also indicates that she possesses a Domain Expansion, but the manga never reveals its name or shows her successfully deploying it. She follows Tengen’s plan to let Kenjaku open his domain so Tengen can dismantle it. Kenjaku’s barrierless domain defeats their assumption, destroys Yuki’s Simple Domain, and leaves her severely injured. Even then, she keeps pressuring him in close combat long enough for Choso to reenter the fight.

As Yuki and Choso press their advantage, she works out the brief range and timing of Kenjaku’s gravity-based attacks. Kenjaku deceives her with summoned curses, then strikes with small versions of Maximum: Uzumaki. The attack is devastating because the virtual mass behind Yuki’s blows does not make her equally resistant to injury. Her tactical adjustments and Choso’s assistance are not enough to overturn their failed domain plan.

Before the battle, Choso struggles with guilt over his younger brothers’ deaths and his own killings. He is prepared to die if doing so will protect Yuji Itadori. Yuki pushes back, insisting that surviving for Yuji matters more than seeking a sacrificial end. Their conversation explains why she later refuses to let him throw away his life when the fight turns desperate.

When Choso tries to sacrifice himself, Yuki urges him to live on as a human; Tengen removes him from the immediate fight. After Kenjaku fatally wounds her, Yuki keeps adding virtual mass to herself with Star Rage until she becomes a black hole, attempting to take him with her. Her own restraint and Tengen’s barriers contain a gravitational disaster that could otherwise engulf the world. Kenjaku nonetheless survives by activating Antigravity System, a technique originally belonging to Kaori Itadori that he retained from an earlier host body. Yuki dies, Kenjaku seizes Tengen, and the defense of the Tombs of the Star Corridor fails.

Her influence is not confined to the fight. Later, Choso gives Yuji Itadori Yuki’s written research on the soul. The transfer preserves an intellectual part of her work after her death and gives Yuji material he can use when facing the problem of souls occupying the same body. The story does not show Yuki realizing her larger dream of a world without cursed spirits.