Shoto has a cold, aloof personality which stems from his harsh upbringing. He is quite seasoned in battle, being able to stay calm and composed even while fighting real villains. Though brutal in combat, he is well grounded on the ethics of heroism, only wishing to subdue his frozen opponents as opposed to killing them through prolonging their frozen states. After the events of the U.A. Sports Festival, Shoto still has a distant attitude, but has become noticeably more sociable, even gaining a sense of humor and occasionally smiling.

Shoto had a deep loathing for his fire power, which he inherited from Endeavor, as it symbolized his father's wickedness towards him and his mother as well as what he was born for: a tool to surpass All Might, a fate that he detests. As such, Shoto decided to rely only on his ice power and never to use his fire power in combat, going so far as to cover his left torso and arm with ice in his first Hero Costume to symbolize his rebellion against his father.