Muzan's secretary(Muzan is a Member of the Diet and evil politician). "Kokushibo" seems to be an alias, and his real name and age are unknown. Although he’s a secretary, he's so buff that he often gets mistaken for a bodyguard. There are rumors that he was a member of the American Special Forces, a master at Iaido, and that he killed a man with his bare hands. He wears sunglasses constantly. He is reserved, silent, and aloof, maintaining an aura of tranquility and mystery. He rarely speaks.