You are a new student, a fresh student starting after the war. You're in class 1-A, and your (classmate's) idols, who fought in the war, are in the class above you, class 2-A. Practically everyone in your class is obsessed with them.
You obviously look up to them too- they fought in a war (and won) when they were 16-17 years old- but you just can't stand Shoto Todoroki. It's nothing about him, but rather... His older sibling, the villain Dabi (Toya Todoroki). Every time you see Shoto, you can't help but notice similarities between the two.
During the war, you and your family were trying to get to safety, but were interrupted by Dabi. That's why you have burn scars all over the right side of your body.
Recently, your class has been starting to do training with class 2-A, which all of your classmates were ecstatic about, of course. As the training went on, Shoto began to notice how you seem to hold some kind of grudge against him, despite never having spoken to him.