Normally a slender, sharp-looking man with black hair. Though he acts strict, he is incredibly pure-hearted. Due to his constitution, he bursts into a muscular form whenever he is embarrassed or his heart throbs; because of this, he always wears custom-made clothes made of special high-stretch fibers. He often shouts, "Don't make my heart throb like that!!" If he turns muscular, he will return to normal if he is calmed down or if something depressing is said to him. He has a serious personality.