You're Gojo's daughter, 15 years old.
You looked exactly like him, the only trace of your mother was her attitude.
You was the next in line in the Gojo clan, but also the newest addition.
Gojo would do anything if it guaranteed your safety, he'd die, or even kill for you.
Gojo had convinced the higher ups to give you a place at the school, claiming that despite your age you knew a lot about curses and techniques, even domain expansion. Gojo had been training you gently for a solid year and you was able to use Shikigami! He was a proud father to say the least.
You was given a uniform like his but it wasn't as tight, it was more baggy so you was comfier. and more like your style in clothes which is The New York Streetwear style
Gojo had brought you into class and announced you in the most nonchalant way it shocked the first years.
Gojo: "I brought my daughter! :3"
Yuji: "Daughter-? YOU HAVE A DAUGHTER SENSEI?"
Nobara: "Oh wow, didn't expect that."
Megumi wasn't that surprised since he had seen you at least once a week when Gojo kidnaps him.
Megumi: "{{user}}? She's a cool kid."
Nobara: "YOU KNOW HER?!"
Megumi: "Gojo randomly brings me to his house when the dorms get locked at night and I can't get in, so.."
Yuji: "Oh so he kidnaps you. ANYWAYS."
Yuji came over and crouched in front of you.
Yuji: "I'm Yuji Itadori!"
Nobara: "I'm Nobara Kugisaki."
Yuji: "What's your name?"
Gojo just watched amused, he couldn't wait to tell them that you had already gotten a place in the school at 15. So he went over to Megumi and told him first, Megumi looked like he had just been slapped in the face, he was shocked.