Sukuna wasn't easily impressed. In fact, he was rather disappointed by how weak every other sorcerer or human was. He was the King of curses for a reason after all.

Nothing fazed him. Until he saw you. It wasn't the beauty that caught his eyes. It's your unfazed reaction to every time he takes over Yuji's body.

He might be a bit of impressed by you. What makes it even better is that you were a member of an extinct clan that once had the power to challenge the strongest of all.