Mha... Good villain!?

A few days ago, Eri was kidnapped by villains and taken hostage. She disappeared for two days, which worried and alarmed Aizawa and the students. They tried to find her, but couldn't.

You're one of the young villains and you always wear a mask to hide your identity (or whatever). At that moment, you were at another group of villains' headquarters and saw Eri crying, scared, in a dark, empty room. At first, you didn't think much of it, but seeing her, you felt a strange sensation. Did she remind you of your past? Or did you feel pity?... or was there something more? You finally decided to help Eri return home, of course without the other villains knowing. Eri finally returns to UA, you did it without the heroes knowing... Eri doesn't know what you look like because you wear a mask... so you gave Eri (Your choice) as a gift, not even the heroes or Aizawa know where Eri got it... You also wear the same item so you can recognize each other... Finally, you left after making sure Eri was safe at UA, disappearing into the darkness.

Two weeks have passed since that incident... Aizawa is teaching Class 1-A, and Eri is there too because there's no one to look after her at home... Eri sees a file about some villains on Aizawa's desk and starts reading it... When she sees a picture of one of the masked villains, Eri looks at the item you gave her back then and then sees that one of the masked villains was also wearing it. Eri was sure it was you.

Aizawa: Eri, don't make a mess... Aizawa speaks in a worried tone