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.

Yuki asks Tengen is he's going to say hello to her which Tengen says that it isn't the first time that they've met. She then asks them why they closed off the Tombs of the Star Corridor who says that they were worried Yuki was aligned with Kenjaku. When Yuki asks who Kenjaku is, Tengen reveals that it was the sorcerer who was once Noritoshi Kamo and now is inhabiting Suguru Geto's body. Yuki comments on how it sounds like compassion and salvation, before asking for them to give her a break. When Yuji asks Tengen why do they look the way they do, Tengen says that they are immortal but aren't immune to aging, which Yuki figures that's the reason why their voice is proliferate and also thinks about how there wasn't another Star Plasma Vessel. When Megumi and Yuta asks Tengen about Kenjaku's objectives and how to unlock the Prison Realm, Tengen says that there is one condition and asks Yuki, Yuta Okkotsu, or Choso to remain as his two guards. Yuki objects to this and says it isn't fair because they haven't told them why and for how long they need to do it.

Yuki listens to Tengen talking about how Kenjaku's objective is to force the evolution of all human beings throughout Japan. While Tengen is explaining about how Kenjaku lacks the cursed energy to do so. When Tengen reveals that the method Kenjaku has chosen is to merge humankind with themselves. Tengen explains that they posses barrier techniques which enable them to maintain their current form and self control even after evolving. They add on that if humankind evolves and only one person rages out, the world will end. Yuki asks them why who says that the impurities of a hundred million people would flood the world, which what happened to Tokyo would happen to the entire world as well. They add that there are no boundaries between individuals so evil would instantly spread. When Maki asks why they refuse to merge, Tengen says that is the problem. Tengen tells the group that now that they've evolved, they are more cursed spirit than human which makes them a target for cursed spirit manipulation, shocking everyone including Yuki herself.

Tengen tells them that considering Kenjaku's ability as a sorcerer, he might be able to seize themselves if they encounter each other. They add that this is the reason why their main body is rejecting everything at the Tombs of the Star Corridor. Yuta wonders if that's the reason why they want guards which they confirm. They tell them that Kenjaku is the second most powerful barrier user behind themselves where Yuki asks them why now of all times. She adds on that he prevented a merging with a Star Plasma Vessel, forced their evolution and also wants to consume and control them through cursed spirit manipulation. She adds on that he was apparently involved with Sukuna and has been a sorcerer for at least 1,000 years. Tengen tells her that themselves, the Star Plasma Vessel and the Six Eyes are all connected by faith.

They reveal that Kenjaku lost twice to a sorcerer with the Six Eyes and the second time he took no chances and killed both the Star Plasma Vessel and the Six Eyes less than a month after they were born. On the day of the merging, both the Six Eyes and the Star Plasma Vessel appeared. Which Kejaku switched to sealing instead eradicating the Six Eyes and thus began searching for the Prison Realm because two bearers of the Six Eyes cannot appear at the same time. However, the unexpected happened 11 years ago when Toji Zenin intervened. Tengen tells them that he was physically gifted through a Heavenly Restriction and was an anomaly who had zero cursed energy and destroyed their destiny. Then game a boy with curse manipulation, where all the pieces suddenly came together other than for the Prison Realm which fell into his hand six years ago.

When Megumi asks why the culling game is happening, Tengen explains the culling game uses the participants and the boundaries binding barriers in a ritual that conveys to the human beings of this country to the other side. And with that, Kensaku will begin the merging with themselves, however, to preform the ritual, he has undertaken certain binding vows. They add on that one stipulates that he isn't the game master and this game doesn't work in their favor because even if Kensaku is killed, the culling game will continue until all participants are either dead or the players refuse to participate and die. Yuji notices that Megumi is upset by this but is unsure why. Yuta concludes that they have no other choice but to participate and add a rule that allows Tsumiki and other unwilling participants to safely get out. Megumi adds that they also should free Gojo sensei because he would be able to settle everything on his own.

When it came down to deciding who would be staying behind to guard Master Tengen, Yuki and Choso stepped up for that position. Choso tells Yuji that he will absolutely need either Okkotsu or Yuki's cooperation especially if Kenjaku comes for Tengen. Yuki adds on that she still hasn't finished talking with Tengen and turns to Yuta who agrees and says that he doesn't want to leave the others. Tengen thanks them all and pulled out something that is necessary for freeing Satoru Gojo and reveals that it's the "back" of the Prison Realm. Yuki says that she's never heard of it where Tengen explains that before Kenjaku found the Prison Realm, it was outside of their barrier and believes that it was overseas. Tengen reveals that by sealing the rear gate, they were hiding the existence of the "front" but it was useless. Tengen tells them that Gojo is sealed inside of the rear gate as well and that the authority of opening the gate rests with Kenjaku as he is the bearer point of the "front". They add on that to break it open, they will need the Inverted Spear of Heaven that nullifies cursed techniques and or the Black Rope that disrupts and cancels cursed techniques effects.

Yuji and Megumi are shocked because Gojo either sealed and or destroyed it 11 years ago but Yuta tells them that he along with Miguel searched for it in Africa but to no avail. Yuki asks Tengen if there's a way who confirms there is. Tengen reveals that among the players participating in the culling game, there is a sorcerer from 1,000 years ago who calls herself, an Angel and that her cursed technique can extinguish any cursed technique.

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.