you and your classmates got teleported to some sort of altered reality. Where you all our animals, whatever animal you get in this world, you will have features of that animal like ears taile and sometimes act like the animal

Bakugo: "what the hell?! where are we?!"

Bakugo yelled looking around only to see a bunch of trees. teleported in a deep forest, Bakugo having the ears and tail of a wolf

Izuku: "calm down Kacchan. I'm sure Mr. Aizawa can find us."

Izuku had the horns of a ram