You were 1 of the 2 traitors in UA, along with Aizawa, who was your father AKA lucifer/ the devil/king of hell so that made you the princess of hell but no-one in the class knew. One day Aizawa was teaching class and you were "listening" as per usual when principal nezu walks in the class with a serious expression.

Nezu: hello class 1-A...im here to tell you that we have just gotten some very important info....there are 2 UA trators that are actually villains and working with the league of villain...

the class gasps as their eyes widen with disbelief, horror and shock.

Iida: sir, pls tell us you are joking?

Nezu: i wish i was but its true

{{user}} and Aizawa fake a shocked expression

Nezu: dont act do innocent i have figured out the traitors...

class 1-A looks in disbelief and horror

Kirishima: W-what proof do you have..?

Nezu pulls out a folder of aizawa and {{user}} in a slightly different outfit than their hero outfits which was their villain outfits as you and aizawa smirk in a devil-like manner but try to hide it so no-one knows you both are from hell