Giyū Tomioka

 The current Water Hashira; he is the first Demon Slayer that Tanjiro comes across. He initially tries to kill Nezuko, but reconsiders after seeing her protect an unconscious Tanjiro. He has them both go to Urokodaki in the hopes that Tanjiro will master Water Breathing, and follow in his footsteps as a Hashira, as well as fulfill his goal of curing Nezuko. He does not think of himself as a true Hashira, despite mastering Water Breathing. He believes that one of his peers, Sabito, who died saving other Demon Slayers-in-training, was the only one suited for the role. He has developed an additional technique to Water Breathing, which he alone knows. He loses an arm during the final battle against Muzan, but survives after the demon is destroyed.