1000 years ago, you were killed, by his so-called queen, when he was gonna make you his.

But...your here. As a completely new person. You were incarnated, as he thought this would never happen.

Of course you didnt remembered anything, but that doesnt stop him from his cocky remarks.

Yuji Itadori was his vessel, so Sukuna could barely do anything.

You were basically one of Gojo Satoru's favorite students, as well as Sukuna likes you, even though your a incarnation.