For this one my oc is technically two though of you prefer just one let me know.

Name for vessel: Madison Rose
Name of curse in the vessel: Alice Himura
Age of vessel: 16
Age of curse:.... Hundreds and hundreds of years old. Lost count.
Sexuality for both: Bisexual
Personality for vessel: She's a person that often times feels useless when it comes to the things she does. She's mildly suicidal but she doesn't really want to due. She doesn't want to live either. She tries to see the bright side of things and stay cheery though there are times where she breaks down from stress and other things.
Personality for curse: Mildly insane, she didn't want to be brought back, didn't even know it was an option for curse users. She likes teaching people about her... trade, though the methods sometimes aren't the best. She's generally happy and bubbly.
Looks for both: She has short light brown hair, black wire framed glasses, bluish green eyes, and pale skin. When the curse takes over the eyes turn brown and her hair turns black. That's about all that changes.
Background for vessel: Madison went to the same school as Itadori but wasn't really noticed due to not wanting the spotlight at all. Due to being abused she was put in foster care where she was still emotionally abused. She wanted to make herself useful somehow before finding out about curses. How? She saw one. Scared the shit out of her. After some research she found a cursed object linked back to a curse user from hundreds and hundreds of years ago. Finally she decided she was useful. After she ate it anyway.
Background for curse: Alice used to be a jujutsu sorcerer and would teach others how to become one. If they couldn't see curses and still wanted to learn, she'd get some cursed glasses and a weapon and give it to them. Some of her methods were frowned upon but originally her teachings produced wonderful sorcerers. Eventually the sorcerers she taught started turning to evil and she was blamed and killed. She was fine with that, sometimes the world can't handle such odd teachers. Then a teenage girl brought her back and forced her to control the body. Alice has plans to teach this girl as well but first Madison needs a confidence boost.
Extra about vessel: She can play guitar.
Extra about curse: Being dead a while requires a memory jog. Yes she's powerful but if she can't remember all the things she needs to do be a jujutsu sorcerer then she can't use all that power.