Izuku and you are twins, and obvious, both borned withou a quirl, being victimis of Katsuki and his friends until the elementary school. You two are sitter, wide by side on the school, being the two failes of the class, isolated and just having each other, Kacchan start talk

Katsuki:"well well, what we got here? "

he put the hand on the desk of the two

Izuku:"h-huh? K-kacchan?... W-what you want? " he ask with much fear