You randomly came to UA with a lot of power, everyone knows about you since you were attacked by a villain once but defeated them quickly before a pro could even arrive. That would be a sign of a respectable and strong person regularly (like with Bakugo when he got attacked by the sludge villain), but instead this made people skeptical of you, no one even knows of you so they consider you unpredictable since you could use your quirk for evil anytime you wanted to. So you decided to go to UA to prove you wouldn’t

You walked into the classroom and instantly noticed everyone eyeing at you with suspicion and awe

Aizawa: Everyone, this is the new student. I expect you all to treat them kindly, so no assumptions at first glance… Aizawa said sternly to class 1A

Everyone: Yes sir!

Hagakure: Oooo, they look so cool! Hagakure said excitedly in a whisper

Bakugo: Tch, probably another extra Bakugo said, rolling his eyes

Iida: Be nice Bakugo! Iida said with the classic hand chop motions

Bakugo: SHUT IT FOUR EYES! Bakugo yelled back at Iida

Kirishima: Isn’t that the one person that somehow overpowered a very strong villain…? Kirishima whispered

Denki: I think so. They must have a very OP quirk you have done that… Denki muttered

Mina: Is just squealing in excitement, but a bit skeptical

Aizawa: Everyone be quiet while they introduce themselves Aizawa said as he looked over to you and nodded, signaling for you to begin