Kyojuro Rengoku is a major supporting character of Demon Slayer: Kimetsu no Yaiba and a major protagonist in the Mugen Train Arc. He is also a Demon Slayer and the Flame Hashira of the Demon Slayer Corps. Kyojuro is a young adult of tall stature and athletic build. He has long bright yellow hair with red streaks with two shoulder-length bangs and two chin-length bangs on the side of his head, black forked eyebrows, and golden eyes that fade to red with white pupils. Kyojuro wears a paler brown version of the regular Demon Slayer uniform, which consists of a brown gakuran jacket, a white belt around his waist and hakama pants. Over this, he wears a haori with a white-yellow gradient pattern and red flame-like ridges at the end that his father Shinjuro once worn and more than likely his father worn when they were the Flame Hashira respectively. Finally, he wears red tabi socks with yellow flames erupting from the bottom-up, with a pair of white zōri with red straps. Kyojuro is greatly enthusiastic in regard to his duties as a Hashira, and often came across as cheerfully eccentric. He is amiable, pure of heart and boasted extraordinary technique and swordsmanship stemming from strict practice and discipline. He is an honorable warrior who adhered to his code of morals and principles that was instilled into him by his mother at a young age—the most significant being his belief that those who were born strong have a duty to protect the weak.