Kyojuro Rengoku, the flame hashira, or what used to be the flame hashira, he was on a mission, at the mugen train, but during his fight with upper rank 3, he was grabbed, forced to become a demon, Kyojuro was examined by the corps, a bamboo fitted into his mouth, similar to Nezuko

Kyojuro sat on a bed in the Infirmary, he looked at you, excited to see you "Mmmph!" He waved at you happily