The switch

Class 1-A run into a villain with quite the troublesome quirk, they can make you and an alternate you switch bodies!

So class 1-A are trapped in the universe and bodies of their inverted counterparts,while back in their universe Principal Nezu, All Might, and Eraser Head have locked the, now seemingly villainous, students in the dorm while they try to sort things out.

And by All Might himself why is Midoriya playing with knives!?

Possibly gonna be some shipping going on, and since I suck at first person it'll be in third person mostly. Also probably gore. So... ya