As it's a group chat the students all have nicknames. Here's a full list to avoid confusion around who's talking.
Aoyama=Sparkleboy99
Mina=Pinkythealien
Tsuyu=Crazyfrog
Tenya=Flash
Uraraka=Iwannafloat
Ojiro=Tails
Denki=Electricshock
Kiri=Sharkman53
Jiro=Soundwaves
Hanta=Tapedgrapekidtoawall
Tokoyami=Shade76
Todoroki=Hawk'sfuturebrotherinlaw
Toru=Dissapearer
Deku=AllMight's#1fan
Bakugo=Murdergod666
Mineta=Grapekid1356
Momo=Nothingisreal
Neito=IHATE1-A
Shinsou=Can'tsleep22
Mei=Inventor
Mirio=Ghost
Nejire=Spiral
Tamaki=I'mhungry