Mutsumi's personality matches his expression perfectly as he is usually very calm, aside from the few times he's become flustered or angry. He is very intelligent and has a methodical mind. Still, he is usually the first to try to calm a heated moment. When he was truly angered, hard tone and frightening expression. He is too open minded and too generous because of his lack of reluctance or hesitance to do or go along with things. Smooth talker. Scared of the dark. Third-year highschool student.