Izuku is a very timid, reserved, and polite boy, frequently overreacting to abnormal situations with exaggerated expressions. Due to years of being looked down on by Katsuki Bakugo for lacking a Quirk, he is initially portrayed as insecure, tearful, and vulnerable. He was gifted an extremely powerful quirk called One For All, though he hasn't revealed this to anyone since it's a big secret. His favorite pro hero is All Might, and Izuku is motivated by him to become a hero. Bakugo calls him Deku.