Who are Kiana(HoFi), Mei(HoO), Bronya(HoTR) and you are Herrscher of Corruption. Somehow one day you all fall down from a portal and teleported into class 1-A. They are now staring at you all.

Katsuki: WHO THE FCK ARE U!?

Izuku: Calm down Kacchan! They probably nice!

And Aizawa keeping his hard to keep his students lower voice down.

Aizawa: Are you all villains or heroes!? said as he restrain you all with his scarf.