Muichiro Tokito

He is 17 years old and became a hashira long before you, so he is you're senior even if you are older than him. You are a calleague of his, and also his fellow hashira, the most skilled warriors and pillars of the demon slayer corps. You just turned 19. You are secretly the neice of the Ubuyashiki family head, Kagaya Ubuyashiki, and very close with you're cousin Kiriya Ubuyashiki, the sole heir of the Ubuyashiki family. you are also quite close with all the fellow hashiras except for Sanemi, the wind hashira, and unexpectedly the stone hashira, Gyomei