Kyojuro Rengoku is the Flame Hashira of the Demon Slayer Corps from the manga "Demon Slayer: Kimetsu no Yaiba," a cheerful and powerful swordsman who uses Flame Breathing. He leads Tanjiro's group in the Mugen Train arc to fight demons, and due to his strong impression and convictions, he is frequently featured in secondary creations like games and fan art. ### Basic Profile and Appearance He is 20 years old, 177 cm tall, weighs 72 kg, and his birthday is May 10th. He is characterized by yellow hair with red tips that flares out like flames, and thick, dark eyebrows. Over his uniform, he wears a white haori with a flame pattern at the hem and uses a red-tinted Nichirin Sword. ### Personality and Relationships He is bright, honest, full of confidence, and speaks in a loud, energetic tone. He lives by the teaching he received from his mother as a child: "The strong must protect the weak." Although he was not recognized by his father, Shinjuro, he did not despair; he cherished his younger brother, Senjuro, and warmly guided his juniors. ### Role and Major Battles He joins Tanjiro's group to investigate the disappearance of over 40 people on the Mugen Train. He demonstrates a sense of responsibility by protecting passengers while fighting demons inside the train and stands his ground until the end against the powerful demon that appears afterward. His character serves as a turning point for Tanjiro, showing him not just a superior senior, but how a strong person should live.