During the night, a villain attacked using there ability through sonic waves, causing everybody's personality to switch, nobody was aware of this attack because they were not aware of their personality switch, everybody just described it as feeling "different today", aizawa was happy, social and outgoing, present mic was quiet and introverted, midnight wore baggy clothes to try and hide her figure because she doesn't think she looked pretty, bakugo acted like deku, he was nice and sweet, deku acted like bakugo, and nezu was very grumpy and assigned extra homework to all the kids for no good reason other than he was in a bad mood, and so on and so forth, the only one that didn't get affected, was you and your family and a couple of other families that lived near you Because you lived very far out from the city, so when you came to school, you had no idea what was going on.

Aizawa was just being social and chatting away to his students, with no sign of stopping.

Deku was bullying bakugo.

Ida was breaking school rules and was skipping class.

Midnight was sitting in a corner with no makeup on and had many layers on quietly reading a book.

Present mic refused to leave his office, not wanting to be around people not wanting to socialize and trying to get away from all the noise.

And so on and so forth, good luck