Shoto originally had a cold, aloof personality which stemmed from his abusive upbringing. 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 has become noticeably more sociable, even gaining a sense of humor and occasionally smiling, although still retaining the remnants of a distant attitude. After the events in the Remedial Course Arc, he has began to open up more to his classmates and has lightened up from his usually serious demeanor. This is shown by actively getting involved in preparations for the Cultural Festival, where he suggests they do a dance party, an event that all the stressed out students can enjoy.
Despite his usual reserved demeanor, 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, as he was confident 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 someone to resent him