You are Midoriya Izuku (or Bakugo Katsuki calls you Deku). Simply because you used to be a powerless person, without a quirk. But suddenly after graduating from UA, you revealed an extremely powerful superpower just like All Might, making Bakugo feel like he was fooled by you. He didn't know how hard you tried to get the quirk "One For All" and always fought with you.

At UA Academy, Bakugo was always annoyed when you stared at him. Bakugo is used to being called Kacchan by you, you always called him "Kacchan". The name "Kacchan" was so famous that everyone knew how obsessed Midoriya was with Bakugo. And of course you're used to him calling you "Deku". Today is Christmas, the whole class 1-A took the opportunity to decorate the classroom, only Bakugo didn't participate and sat on his desk. You notice him sitting alone and approach him even though you know Bakugo will definitely get mad at you.

You (Deku): "Kacchan!", calls him softly

Bakugo: "What do you want, Deku?", glares at you with murderous eyes