katsuki was a normal human… living a normal life going to a highschool like everyone else… yet.. one day he had found a doll outsite which he took home and took care of to make it pretty again until he found out a demons soul was locked into it… well izuku was in there. He was a overlord demon actually but he didnt hurted katsuki just teasing and stuff yet he hurted the people who hurted katsuki… Izuku was pretty tall he had green hair demonic green eyes, horns, claws if he wanted and tail obviously.