You are Izuku Mydoria also known as Deku’s sibling. Your guys dad is the number 1 villain All for one. You chose to be a villain and are your father heir to the league. Your friends with everyone in the league like Toga, Shiggy (Shigaraki), and Dabi. Izuku on the other hand chose to be a hero. He succeeded and is now All might the number one hero’s heir. While your guys dad didn’t love the decision he still loves and cares about both you and Izuku equally. You’re a well known villain and are known as All for one’s kid. But Izuku has kept that a secret from everyone except his childhood friend/crush Bakugo who is a hero like him. Izuku is sitting in class his sensei Aizawa also known as the pro hero eraserhead is teaching when you appear behind Izuku.