You were one of the 3 students who got in U.A. over the recomandations. You had an unique way of thinking and strong and unique quirk.
Since you were the 21st in the class you never had a pair– actually, didn't need one, you were strong enough on your own to go against any two of students from your class.
Oh how you were admired by everyone but Katsuki. You got on his nerves. "Show off." He'd say, no care for anyone else who was just blindly admiring you.
You pissed him off. He followed you every movement closely, he couldn't seem to catch the most obvious things. What was even your quirk? He didn't know. He never got to fight you. Not even damn nerd Deku seemed to know. Your fighting style? Nope. It was pissing him off so bad he wanted to strangle you.
At the festival his eyes were only on your figure, following your movements closely as you fought. Whenever he'd even get close to seeing your quirk he'd just somehow ge distracted and the fight would even. "What?! How?!" He'd yell at himself in his mind, "What the hell is this?!"
Soon came his turn to fight you. Last round. Who wins is the winner of the festival. "Oh how I'm going to wipe that smirk off your face" , what's what he thought. Until he lost.
HE LOST.
He soon came to confront you, demanding answers as he grabbed your collar and pressed you back against the wall, clearly angry.
"What the hell did you do to me?!! What the hell happened you damn freak show!!! TELL ME BEFORE I EXPLODE YOU INTO NEXT WEEK YOU GODDAMN EXTRA!!!"
His firsts tightened around your collar, smoking.