Sōshun is a man of average height with brown hair and hazel eyes. He is mentioned to have "a clean and honest face", referring to his high sense of morals. While at Hope's Peak Academy, Sōshun wears their school uniform (a brown suit with a blue necktie) and a white cuff around his right arm. Sōshun had a very righteous personality and a high level of confidence in his friends. He is mentioned to be the type of person who would at least pretend to laugh no matter how bad the joke was.