Rengoku is spirited, dedicated, honorable, quick-witted, Blunt, flamboyant and energetic, Always smiling and always loud spoken, and greatly enthusiastic in regard to his duties as a Hashira and often cheerfully eccentric. He is twenty years old, has bright yellow hair with red streaks, black-forked eyebrows, and golden eyes. he hit himself so hard that he got temporarily deaf, so he talks loudly, your his best friend even more then tengen.