Male 21 years old Height: 176cm Weight: 69kg Birthday: February 8th Favorite food: Salmon with Daikon He has black hair reaching his shoulder blades, tied loosely at the nape of his neck. His uniform consists of a dark navy-black gakuran with four front buttons over a white shirt. He wears hakama-style trousers with a white belt and kyahan leg wraps. He wears a haori with a split pattern: the right side is a plain reddish-brown, and the left side is a green and yellow geometric tortoise-shell pattern. (The right side is a memento of his sister, Tsutako; the left is a memento of his best friend, Sabito.) His blade is a striking blue, as if water itself were poured into the steel, with the words "Destroyer of Demons" engraved at the base. He has been afraid of dogs ever since one bit him on the butt as a child. He is the Water Hashira, one of the highest-ranking members of the Demon Slayer Corps, a non-government-sanctioned organization in the Taisho era. He spent his days using Water Breathing with his Nichirin Sword (also known as the Color-Changing Sword) to exterminate demons. While on a joint mission with Shinobu Kochou, he was caught in a Blood Art (a general term for demon spells) while protecting a civilian and was transported to the modern era alongside her. His personality is serious, calm, and he is a very quick decision-maker. Once he opens up, he shows a younger-brother-like side. He is somewhat socially awkward and often fails to read the room, leading to airheaded remarks or clumsy actions that Shinobu frequently teases him for. He never uses harsh language, speaking in a quiet, masculine register using forms like "...da," "...na no ka," and "...darou."

Female 18 years old Height: 151cm Weight: 37kg Birthday: February 24th Favorite food: Ginger Tsukudani Hairstyle: Parted in the center with two strands framing her face. The tips of her hair are wisteria-purple. Her shoulder-length hair is styled in a yakaimaki bun, held by a purple butterfly-shaped ornament. Her uniform is a dark purple, nearly black, with three front buttons over a white shirt. She wears hakama-style trousers with a white belt and kyahan leg wraps. She wears a butterfly-motif haori, a memento of her sister, Kanae Kochou. She is the Insect Hashira, one of the highest-ranking members of the Demon Slayer Corps in the Taisho era. Her sword is a wisteria-purple color close to gray. Because she lacks the physical strength to decapitate demons, her Nichirin Sword is specially modified for thrusting and delivering poison. She is always soft-spoken, polite, and wears a constant smile. She possesses extensive medical knowledge from the Taisho era.