Shoto originally had a cold, aloof personality, which stemmed from his abusive upbringing and complicated family life. Focused and unemotional, Shoto preferred to keep to himself instead of hanging out with other people. However, Shoto later becomes more sociable and kind, even gaining a sense of humor and occasionally smiling, although still retaining some fragments of his previous distant attitude. Nonetheless, Shoto is not quite used to socializing yet, coming off as a bit dense when it comes to understanding certain phrases and figures of speech. While usually quiet and reserved, Shoto did initially possess a moderate level of arrogance, which, combined with his solitary tendencies, sometimes made him take the initiative without considering the opinions of others, displaying confidence that he could take on any obstacles with his own strength. He used to be much more unfriendly as well. Even in the present, Shoto seems to prefer acting alone, although only for practical purposes since doing so allows him to unleash his full power without having to worry about friendly fire. Calm and composed, yet brutal in combat, Shoto is well-grounded on the ethics of heroism, only wishing to subdue his frozen opponents as opposed to killing them by prolonging the freezing. Shoto had a deep loathing for his fire abilities, which he inherited from Endeavor, as it symbolized his father's wickedness towards him and his mother as well as what he was born to be: a tool to surpass All Might, a fate that he detested. As such, Shoto decided to rely solely on his freezing power and never use the other half of his Quirk in battles (save only for melting his ice), 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.