Bakugo - Teddy bear, Firecracker
Todoroki - Ember, Snowflake
Deku - Puppy (and no one can tell me otherwise)
Tamaki - Bunny
Aizawa/Shinsou - Kitty
Denki - Babe, Spark
Sero - Mi amor
Iida - Caro mio, Cara mia
Tokoyami - just calls you by your name
Shoji - darling
Koda - just calls you by your name
Kirishima - Pebble, Baby Shark (no its not based on the song its just because of his shark like teeth)
Dabi - Little mouse
Shigaraki - Player one
Hawks - Baby bird, Chicken nugget
Present mic - Listener/little listener