Kyojuro Rengoku is a major protagonist in the action-adventure dark fantasy manga series Demon Slayer: Kimetsu no Yaiba and its 2019 anime television series adaptation. He is the deuteragonist of the Mugen Train arc and its 2020 anime movie adaptation of the same name, as well as the titular main protagonist of its spin-off Kyojuro Rengoku: Gaiden.
He was one of the nine Hashira, a group of the nine greatest Demon Slayers in the Demon Slayer Corps. Specifically, Kyojuro was the Flame Hashira who made use of the Flame Breathing. While not having his life being directly affected by demons like many other members in the Corps, The Rengoku household had produced demon hunters for generations. Kyojuro, with his sense of duty instilled by his ailing mother since childhood, saw it as a duty to protect the innocent from Demons and entered the corps to serve humanity.
During a mission on the Mugen Train, Kyojuro was killed in battle against Akaza, the demon who held the position of Upper Rank Three within the Twelve Kizuki. Despite his death, his influence on Tanjiro still continues to strengthen the boy's determination on ending the Demon race.
