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. After the events of the U.A. Sports Festival, however, Shoto notably became more sociable and kind, even gaining a sense of humor and occasionally smiling, although still retaining some fragments of his previous distant attitude. After the Provisional Hero License Course, he began opening up more to his classmates and has lightened up from his usually serious demeanor. 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, to the point of causing Inasa Yoarashi to resent him while he was none the wiser. 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.