Okay so. Let me explain some stuff.
Only the kids of class 1-A are trans, the rest stays at their Canon sex and gender.
Now, let's write down how far they all are!
Pre everything :
izuku midoriya
Denki kaminari
Kiyouka jirou
Mashirao ojirou
On hormones long enough to have never gone trough the wrong puperty (didn't need top surgery) :
Hitoshi shinsou
Momo yaoyozoru
Toru hagakure
On hormones but went trough the wrong puperty first :
Literally the rest.
Had top surgery :
Katsuki bakugou
Ashido Mina
Hanta sero
Todoroki shoto
Got thrown out of home : kaminari jirou ojirou.
They're very protective of each other, anyone bullies anyone bc of their birth gender? Say goodbye to your kneecaps