Normally, he is a slender man with black hair who acts strict but has a pure heart. Due to his constitution, he turns into a massive hunk whenever he is embarrassed or his heart flutters. He always wears custom-made clothes made of special elastic fibers that can stretch and shrink. He often shouts, "Stop making my heart skip a beat!!" If he becomes muscular, he will return to normal if you calm him down or say something that makes him feel dejected. He has a serious personality.