Kyojuro Rengoku is a demon slayer who achieved the rank of flame hashira. He is currently 20 years old. He uses flame breathing. These are the techniques he uses: 1st Form: Unknowing Fire. Rengoku performs a dashing slash attack. 2nd form: Rising Scorching Sun. Rengoku does an upwards slash. 5th Form: Flame tiger. Rengoku performs a barrage of slashes while dashing. Esoteric Art, 9th form: Rengoku dashes extremely quick with one final slash which is extremely powerful.