Kieran Santos/Synopsis

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==History==
Kieran Sōsei grew up in the arms of a loving family who ran a struggling, small coffee farm. His parents were confounded at the sight of his unusual eyes, but when he grew, they eventually served to help his family on the farm. When he awoke his cursed technique at four-years-old by summoning a character from a picture book his parents read to him, his grandfather recognized it as his mother formerly told him tales of how they used to be magic users in the long past. He isn't able to help his family much, but he still tries his best everyday. However, one day, at seven years of age, when he was after falling asleep after a hearty dinner, he awoke in an unfamiliar place. Strangely clothed people enter his room and inform him of where he is and how he is now an esteemed member of the Special Activities Division, or Theurgy Division.
Kieran asks where his parents are and they respond that they no longer matter. They continue and say that after being introduced to the Division and how it works, he will be trained and then sent onto a mission. He once again asks where his parents are and the room begins to warp, reality bending to his whims. He is quickly sedated and when he wakes up again, they tell him of his situation. He asks where his parents are, more angrily this time, and the process is repeated another four times until a higher ranking individual informs him that if he wants to see his parents again he must conform. Kieran reluctantly agrees, scoping the situation out, and is informed that this is one of the headquarters of the United Society of Cursed Arts. He is given English classes, informed of his cursed technique, trained in combat, and normal education.
After he accomplishes his first five missions, as promised, he is allowed to see his parents again. However, his parents are now living lavishly and he sees that they now have twins and don't seem to be missing him in the slightest. He approaches them and nervously reintroduces himself, but only receives lukewarm, awkward reactions. He realizes that his existence has been erased from the house and he returns to USoCA. The higher ranking individual who accompanied him explains that when the USoCA reached out to his family, they were more than happy to sell him. Kieran is shocked by the news and is quiet on the entire trip back and resigns his entire life and being to the USoCa.
When he is ten, Tahoma Lapahie allows him to come to his house to train during the summer, and they bond, Tahoma unknowingly only praising Kieran when he does something to please him. He grows attached to him, and the next year, he is given a pet canary with white-purple feathers.
==Synopsis==
===The Book of Genesis===
Kieran, at twelve years old, is met with a girl named Yanhui and immediately shows disdain for her, protectively standing by Tahoma. He explains that someone he owes a favor has asked him to help teach Yanhui, and that she will stay with the pair for the summer. She and Kieran immediately clash, Kieran asking why she's pretending to be British. Yanhui is unsure of how to respond and Tahoma breaks them up. They bond very closely through the course of three months, but come to a standstill when it comes to Yanhui's issue. As Kieran plays Animal Jam, he is scammed out of a black spiked collar, and proceeds to have a meltdown. Yanhui, peering over his shoulder, does not understand, and is simply fascinated by the game. She, from then on, calls him "Spike".
She leaves and comes back a year later, now a rhythmic gymnast. Kieran realizes just how much this small family of him matters to him after yearning for this day ever since he'd left, but hates how Yanhui has changed quite exponentially. A week later, however, they return to the swing of things. He disgruntedly reveals that he has found a solution to Yanhui's problem and has her eat some mystery pills. She passes out and her cursed energy explodes before settling down, clock markings appearing on her skin before fading. He reassures Tahoma and carries her to bed, and they sleep. However, a wave of special grades attack the house due to all of Yanhui's infinite cursed energy being released at once and kill Tahoma in the dead of night. When the children awake, they are met with his corpse, and Yanhui has a mental breakdown, returning to a simplified world of flowers and happiness, blocking out everything around her. She unknowingly wraps her surroundings into her incomplete Domain and Kieran tries to bring her back to reality. She refuses to, rocking herself and covering her ears, when the clock on her right eye goes back an hour, bringing Tahoma back to life.
Kieran explains the situation to Tahoma after Yanhui passes out and Tahoma suddenly realizes why Gojo has pawed her off to him and why she's not been given to the same organization that handles Kieran. He deduces that she can manipulate time and makes plans with Gojo, telling Kieran he should do his utmost to protect her. They do their best to erase her residuals. When she awakes the next day, Tahoma forces her to place a Binding Vow on herself that is set with her own conditions that will restrict her cursed energy amount so that she will be less likely to drop dead at any given moment and not be revealed to be a special grade. When Kieran and Yanhui relax on the couch one last time, Kieran tells her she can't leave lest she be found out.
Yanhui agrees and then says that Galina needs her. Kieran jeers at her for being interested in meaningless things such as ballet and sports when she has such great power, causing Yanhui to flush. She promises him that rhythmic gymnasts and ballerinas both have short careers and he then caves in, planning to take more missions in Russia.
=== Cursed Child Arc ===
During the Night Parade of a Hundred Demons, Yanhui is currently attending a charity Christmas gala for politicians and oligarchs held by her rhythmic gymnastics coach and who she considers to now be her surrogate mother - Galina Iner. She is dressed in a short, revealing qipao with a cut-out chest and high leg slit. Irina comments on how the only things her growing hips and breasts are for is to attract the men. She jealously watches as Galina tends to other gymnasts and mentions how one of Galina's former gymnasts has become the mistress of the President and bore him twins. Yanhui clenches her fist until blood appears and she goes out onto stage, first playing the guqin and then a dance to stereotypical Chinese music. Some of the crowd praise Galina for finding such an oriental, rare species. The lecherous gazes of the sea of men watching her cause her to have a panic attack despite seeing them as child-like animal creatures. She runs offstage after her head begins to ache from repressed memories and Galina begins to lecture her in front of the other gymnasts, gripping her arm tightly. She says this wouldn't've happened if she didn't spend all her time wasting away at her ballet academy ran by an idiot.
Yanhui begins to hallucinate again, refusing to face the reality of Galina's favor slipping, when she remembers her cursed technique. She goes back in time and is shaking, realizing she can't perform. She looks through all existing timelines and finds the most perfect one, enforcing the perfect outcome to come into reality. Once she's finished, she's met with a standing ovation, but can see some wives calling her a whore. Her head begins splitting open and she almost has another episode. After the other performances, Galina gives her some criticism, and dinner begins, and she is groped by an old man and told disparaging comments, now surrounded. She almost has another panic attack, gazing at their faceless selves, but gets through it, albeit incredibly light-headed. Her phone is endlessly buzzing from Gojo texting her and asking just where she is.
===Catacombs Arc===
===Cursed Womb Arc===
Yanhui, now fourteen, exorcises a curse built from the resentment of the Vaganova Academy students, besting it with positive energy formed from the Reverse Cursed Technique as she is unable to really use her technique. She continues on with her ballet classes, and chats with Vera, who is revealed to be her girlfriend, and bears a striking resemblance to Mary. After the school day ends, she texts Kieran and asks for ride to Tokyo. They chat for a bit and he drops her off at the detention center. Yanhui introduces herself and apologizes for being so late, saying she was busy with some private matters. The trio immediately register her as carrying an extremely odd aura that chills their soul whilst also granting them a sense of yearning.
They then head inside after Yanhui flaunts her student ID and Megumi is surprised to see they've entered a curse's Innate Domain. Yuji and Nobara comically begin to panic but Megumi stays confident that his Divine Dog will smell any threats. The squad moves out to find any humans trapped inside and eventually happen upon their mutilated bodies. Megumi and Yuki begin to argue and Nobara begins yelling at them both. Yanhui sees a vision of the future and shoves Nobara aside, dragged through the floor by a curse. 
Yanhui is immediately surrounded by innumerable curses and expertly wraps both her hands by opening her pocket dimension, seizing two pairs of satin pointe shoe ribbons. She engages in combat quickly, naturally moving at supersonic speeds and dealing incredible damage with simply her body. Her cursed energy is the fastest thing in the known universe, carrying the qualities of time, and is extremely malleable with a grid-like pattern, a nod to the fabric of time. When she realizes just using cursed energy will take some time, she simply skips to a minute forward in time, bringing in the effects of what would've happened had a minute passed into that exact moment. 
She manages to meet up with Nobara, saving her from a few curses with a few punches, and helps heal her wounds, Nobara viewing her as a holy being. Megumi then arrives, and together, they travel outside of the detention center. Yanhui volunteers to take Nobara home as Megumi waits for Yuji. 
After Yuji passes away, in Tokyo, four mysterious figures walk amongst the regular crowd of people. They discuss why the sorcerer among them used a Sukuna Finger in order to test Sukuna's strength. Eventually, they stroll into a café where everyone can only see the man despite the cursed company he's keeping. 
===Cursed Training Arc===
Saddened by Yuji's death, Megumi, Yanhui, and Nobara sit on stairs together. They try to act like they're not upset since they haven't known Yuji very long, but they can't hide it. Yanhui, however, does not share their sentiments since she'd only spoken a single word to him, so she tries to comfort them and hints that he isn't truly dead. The second-year jujutsu students arrive to find them sulking. Maki asks why they're looking so glum but Panda reveals that their classmate died. This is Nobara and Yanhui's introduction to their senpai: Maki Zenin, Toge Inumaki, and Panda. Panda apologizes for Maki's rudeness and asks that they participate in the Kyoto Sister-School Goodwill Event. Since the third-year students are suspended at the moment, Tokyo High needs more participants. In order to get stronger for Yuji, both the first-years agree to participate, and Yanhui decidedly agrees with nothing else to do.
Elsewhere at the meeting between the sorcerer and cursed spirits, the curses explain that they want to make their kind the true beings of the Earth and gain the dominant position the humans currently have. They've come to ask how to defeat the jujutsu sorcerers. In order to go to war, they will need to render Satoru Gojo unable to fight and make Sukuna their ally. The curses believe Yuji to be dead but the sorcerer isn't so sure. The sorcerer also reveals something surprising - they must also seal Yanhui. The curse asks who she is, and angrily says that if he doesn't know her, she must be irrelevant. The sorcerer smiles and says that there is more than meets the eye with her.
While Yanhui goes to her dorm after a day of labor, she reveals her daunting room. Inside is a towering cardboard cutout figure of Pope Francis, lots of mirrors so she can be "surrounded by winners", an ethereal painting of pregnant Sonic, and a sign with a mustache that reads "Man Cave". She has no bed and does not even use her room, instead sleeping in her pocket dimension where even spending a millennia there equates to no time passing in the real world. Once she has woken up, refreshed, she teleports herself to the Vaganova Ballet Academy whilst having a body double pulled from the time stream attend her lessons in Tokyo in her stead. When she arrives, she changes into a leotard and pink tights, and eats breakfast in the cafeteria. However, soon the students will be weighed for a monthly weigh-in, and a voice in her head criticizes her for becoming such a fat pig. She goes to the bathroom to regurgitate her meal and lotus flowers seem to fall from her lips. 
During pas de deus class, a male student flirts with her, and she reciprocates. She seems to be in somewhat of a daze, and when in the changing room, hears a shriek from one of her classmates. They found an active spiderweb, and Yanhui shudders, quickly leaving to the Novagorsk gym. Galina body shames her upon seeing her and constantly points out minor errors in her routines, chastising and yelling at her. She informs her that after the gala, she's found at least six men who are interested in her, and that if she wants them, she will have to make sure she doesn't embarrass Galina. 
===Kyoto Goodwill Event Arc===
They enter her room, which has since gained new decor, including a tapestry of Philipp Kirkorov with the Russian word for "pussy" above him, a hauntingly large statue of a clown dressed as a ballerina, a disco ball above the Pope cutout, who is now joined by five other figures and is wearing a scarf of boobs. Yanhui explains the colors of the Pope and what they represent - white, meaning it's time to pray, blue, meaning he's sad and to perhaps cheer him up with a prayer, and red, which is danger. She says she has security cameras on him to ensure he doesn't move when she isn't looking and decided they weren't enough, which is why she has now given him more companions. After grabbing her lucky charm, a yodeling pickle toy, she leaves with her schoolmates.
===Party Arc ===
=== Shibuya Incident Arc ===