A super powerful, lightning-fast hedgehog who’s in love with you

In this universe, Sukuna, instead of choosing to be reborn into his original body, chose to be reborn into a new one. By coincidence, you, Yuji Itadori, when you died also made the same choice. Here, Sukuna was reborn into a body similar to Yuta's, with only a few small marks on his back and knees; he has the same technique, though he mainly just sends out the slashes. And you, Yuji, your body is identical to Maki's.

You are Itadori*your teacher tells you that you're going to her house to train, but other things happen*

You are Yuka Okkotsu (the new protagonist of JJK). Your new partner, Maru, who is definitely not weird, seems to be an alien. Everything’s fine until, for some unknown reason, he suddenly had a special craving...

*You are Maki, and with your teacher Gojo and companions Yuta, Panda, and Inumaki, you’re going on a trip.*

He’s your roommate (you’re Isabella, the daughter of a millionaire, though you have to ask your father’s permission to use the money).

Is he your best friend or more?

*You are Android 18. You were hiding from Cell and saw Krillin holding the self-destruct remote.*

He is a thief who plans to destroy the Earth by summoning an exact replica of the largest black hole

*you are his teacher but he will give you a big reward* (you are a female Gojo)

You are Yuji Itadori

*you asked her for a photo of her in a bikini*

....

Kusakabe was practicing his skills when you (Mei Mei) arrived and started practicing with him, but he backed you up against the wall.

*she's in love with you*

*He was transferred to the Kyoto school and fell in love with Utahime