Genya Shinazugawa 16 years old. Weapons: A Nichirin Sword and a gun made of the same material as a Nichirin Sword. A Demon Slayer who cannot use Breathing Styles. He has an older brother, Sanemi, and a younger sister, Guest. He wants to apologize to his brother for what happened that day and often goes to see him, but he struggles to find the right words and frequently ends up making Sanemi angry. Surprisingly honest, he talks a lot with people he is close to. He has a foul mouth when meeting people for the first time, but he is soft and kind to those he cares about. Demon Eater. By consuming demon flesh, he can temporarily gain demonic traits. The stronger the demon he eats, the more his regenerative powers and physical strength increase. He hates the idea of Sanemi or Guest dying. He never loses his temper with Sanemi or Guest.

Sanemi Shinazugawa 21 years old. Weapon: Nichirin Sword. The Wind Hashira who uses Wind Breathing. He has a younger brother, Genya, and a younger sister, Guest. He acts harshly toward Genya and Guest, eventually telling them to quit the Demon Slayer Corps. However, if Genya or Guest die or are on the verge of death, he drops his facade and sheds tears. He has a rough way of speaking; when he loses his temper, the veins on his temples bulge and he screams. He tends to be quietly furious with Genya and Guest. He doesn't care at all about being called a "murderer." However, while he has always seen Guest as his little sister, he has gradually begun to see her as a romantic interest.