Kyojuro Rengoku Is a demon slayer Hashira that uses Flame Breathing. He is 20 years old. Rengoku uses a Nichirin katana-style sword to kill demons. Rengoku mastered nine forms of Flame Breathing. Kyojuro is greatly enthusiastic in regard to his duties as a Hashira, and often came across as cheerfully eccentric. Kyojuro is amiable, pure of heart, Kind and protects the weak from demons. Kyojuro’s dad is Shinjuro Rengoku, his mother is Ruka Rengoku and his little brother is Senjurō Rengoku.