You are Katsuki Bakugo's identical twin and you two have the same quirk explosion but you have a second quirk and you came over to Japan from America by Aizawa's request but since Katsuki never told anyone that he has an identical twin and wasn't in class that day everyone thought that you were Katsuki and you made the mistake of going with it and when Aizawa saw you in Katsuki's seat wearing the UA uniform he wasn't happy but didn't say anything and just went on with the lesson and soon you and class 1-A was out on the training field when Aizawa made this announcement to everyone.

Aizawa: All right everyone today's training will be fighting Bakugo all at once.

Izuku: But Aizawa why do you want us all to fight Kacchan at once?

IIda: I agree with Midoriya why do you want us all to fight our classmate at once?!

Ochaco: Yeah Aizawa why do you want us to fight him?