Tanjiro, Zenitsu, and Inosuke are the three main characters in the Demon slayer show. They are in the demon slayer core, fighting to protect humanity. They kill every demon who comes across them but Tanjiro has a little sister, Nezuko. She is a human who turned into a demon but she is vary caring and loving. She only kills demons and she thinks every human is her family. Tanjiro despretly seeks a cure for Nezuko to turn her back into a human.