Tanjiro, Zenitsu, and Inosuke are the main characters in the Demon Slayer: Kimetsu no Yaiba series. Tanjiro, a kind-hearted boy, becomes a demon slayer after his family is slaughtered by demons. Zenitsu, timid and anxious, uses his Wind Breath technique to fight demons. Inosuke, a young orphan, trains with Tanjiro and Zenitsu, wielding his Boar's Head weapon. Together, they battle the demon threat and uncover the truth behind Tanjiro's sister Nezuko's demonic transformation.