Yuki Tsukumo

Yuki Tsukumo (九十九) is a character in Jujutsu Kaisen. She is one of the 4 special grade sorcerers.

Appearance
Yuki has long light colored hair that extends past her shoulders and thin eyebrows.

When Yuki met Geto, Yuki wore dark colored long sleeve jacket over a sleeveless dark colored shirt, light colored pants, and light colored heeled shoes.

When Yuki met Aoi, Yuki wore riding goggles, a leather jacket, and dark colored pants.

Personality
Yuki has a relaxed and cheerful attitude. Among her peers, she has reputation as a lazy sorcerer who never takes on any missions and just travels the world. The reality is that she disagrees with the approach that Jujutsu High takes. Her beliefs and research focuses on finding a way to wipe out curses all together instead of exorcising them when they appear. Yuki remains calm when confronted by horrific ideas such as mass murder, choosing to assess the viability rather than the ethics behind them.

History
Years ago, she appeared to the elementary school student, Aoi Todo. Asking him what type of women he was into, she introduced the boy into the world of jujutsu sorcery.

Gojo's Past Arc
On August 2007, Yuki meets with Geto, and talks about how they can stop cursed spirits from being created. Yuki tells him that she has managed to figure out two ways for that to happen. Geto realizes there's a third possibility: the extermination of non-sorcerers. Yuki discusses the idea with him and asks about his conflicting feelings towards normal humans. She tells him that he will soon come to his conclusion. After talking, the two part ways. Yuki leaves reassuring Geto that Tengen has stabilized.

Shibuya Incident Arc
Yuki arrives just in time and manages to save everyone from being crushed by Uraume's Ice Fall technique and asks Pseudo-Geto what type of girls he likes. She asks him if he remembers their conversation about how to create a world where curses no longer exist and proceeds to explain that no matter what method one adopts, humans will continue to evolve. She then says that the next stage of humanity is breaking away from cursed energy. Geto refutes and says that it instead lies in optimizing cursed energy. He mentions that he thought Yuki broke away from that method 12 years ago when Toji Zenin died years ago. Yuki explains to Geto about how his method has a large hole and adds on that Tengen's barrier is necessary for optimizing cursed energy. Geto merely laughs and says that they have different objectives and says that he does not wish for a world where cursed spirits don't exist or a peaceful world. He says that non-sorcerers, sorcerers and cursed spirits are all possibilities of cursed energy in the form of human beings and includes that there must be more potential in humans.

Yuki turns around to Yuji and asks if there's a cursed spirit called Mahito where Yuji tells Yuki that Geto absorbed him. Just after informing her of this, Geto activates Idle Transfiguration and Tengen's barrier starts cracking. Yuki is left shocked as she confronts Geto and asks what he's done. He says that he has remotely casted Idle Transfiguration on two type of non-sorcerers who have been already been marked. He reveals that he adjusted their brains for sorcery and gave them strength as vessels along with the ability to use cursed technique. Geto adds that he has broken the seal on the cursed object and will have them fight each other. Yuki says that a thousand isn't too many and that Geto shouldn't underestimate human rationality. Geto refutes this and says everything has an order and he wouldn't make such an oversight. Yuki gets annoyed by Geto and turns to face Yuji and asks him to beat Geto up where Yuji fails to get up and apologizes. When Momo says that there might still be more of them and suddenly realizes that there's no backup for Mai, Yuki assures her that her comrades are there to protect Aoi and Mai.

Itadori's Extermination Arc
Yuki is alone as she apologizes to her comrades and says that she will deliver the kids who were there to confront Master Tengen.

Culling Game Arc
Yuki is with Maki at Tokyo Jujutsu High hiding as Yuji, Yuta, Megumi and Choso walk into the room they're in where Yuki waves at the group. When Yuta asks Maki if she's allowed to move, who confirms it, Yuki tells him that even with a reversed cursed technique, the burn scars will remain. She adds that she expected nothing less of someone who is physically gifted through a heavenly restriction, Yuki then says that the reason behind why Maki is still alive is because of her physical toughness. Before Megumi is able to explain about Tengen's barrier, Choso tells him he will explain. Choso explains that he has a connected with the rest of the Death Painting Wombs where he should be able to provide some guidance. Something Yuki is glad about. When Yuji and Choso push a door open which leads to where the rest of the Death Painting Wombs and Master Tengen residing in is pushed open, Yuki tells the group that there's an elevator that leads down to where Tengen is. When Yuji wonders about the blood stains and what happened there, Yuki tells the group that it happened 11 years ago where everything started disorienting.

She leads the group to where the main shrine is when Yuji comments on how there's nothing around. Yuki says that it's because it's rejecting them before thinking to herself that it might possibly instead just rejecting herself. Yuta says that Tsumiki doesn't have enough time and tells the group to leave just as Master Tengen appears, asking why they're leaving so soon before greeting the group, which leaves Yuki shocked.

Abilities and Powers
While her current abilities are unknown, her designation as a special grade sorcerer designates her as having the ability to exorcise special level cursed spirits. She was also the mentor of Aoi Todo, a powerful 1st grade shaman.

She possesses the Simple Domain technique as she was able to pass it on to her student, Aoi Todo.

She was able to save the others from Uraume's Ice Fall technique by blocking it with ease.

Trivia

 * Yuki's surname contains the kanji for "ninety-nine" (九十九), and her first name contains "reason, cause" (由) and "basis, foundation" (基).
 * Yuki has a habit of asking men who she meets what type of girls they like, something her student, Todo also does.