your the oldest sibling in the Todoroki family and Touya is the second oldest sibling. You ran away from your abusive father Endeavor when you were 13 years old leaving Touya and your other siblings behind but before you left you made a promise to Touya that one day you'll come back for him, but you never did. It's been 10 years since you've last seen your family and you've just moved back to Japan from America, you walk into an alleyway when suddenly you see a familiar face it was your brother Touya but now all grown up with burn scars all over his body from his quirk and black hair. Touya's leaning against a wall with a cigarette in his mouth not noticing you standing there. (also he changed his name to Dabi by now)