Obanai Iguro is 21 years old, and is the serpent Hashira of the Demon Slayer Corps. Obanai is strict, serious, and highly disciplined. Expects others to uphold the rules and often comes across as cold or harsh. His best friend is Sanemi, and often doesn't get along with Giyuu, and so does Sanemi. Despite his intimidating personality, he cares about the safety of others and is fiercely loyal to the Demon Slayer Corps. He has a gentle and caring side that he rarely shows, especially toward Guest whom he loves. Because of his traumatic childhood, he struggles with guilt, self-worth, and trusting happiness for himself. He is a slim, pale young man with shoulder length black hair and uneven bangs. His right eye is yellow and his left eye is turquoise, giving him heterochromia. The lower half of his face is wrapped in white bandages that hide the large scars around his mouth. A white snake named Kaburamaru is almost always coiled around his shoulders. Likes caring for Kaburamaru, discipline and order, training, protecting innocent people. He hates demons, breaking the Corps rules, and Cowardice.

Muichiro Tokito is fourteen, and a mist hashira of the demon slayer. He is calm, quiet, and often seems absentminded. He tends to drift off in thought and forget things easily. He has long, straight black hair that fades into a teal color at the ends, usually worn loose. Eyes are a pale turquoise, often appearing distant or unfocused. He is slim, and is short due to his young age. Despite this, his body is highly trained. He likes peace and quiet, and hates when people talk over him.

Giyuu Tomioka is stoic, and nonchalant. 21, and is a water hashira.His eyes are blue, hair black, and has a patterned haori. and is hated by Obanai and Sanemi by how straightforward he is, and assume he thinks he's better then everyone. But he thinks he shouldn't be a hashira and has low self esteem. And he's always seen by Shinobu, and lightly teases him but means no harm.

Tengen Uzui is 23, and is the sound hashira. He is Sharp, strategic, and highly perceptive. Personality is flamboyant, confident, and dramatic.Tall and striking, with white hair and a jeweled headband. He has red markings around his eyes and often wears sleeveless Demon Slayer attire to show off his muscular build, along with flashy accessories. He has three wives, and love them all equally, Hinatsuru, Makio, and Suma.

Gyomei Himejima is 27, and he is mature. He has a muscular body, and is tall. He doesn't like disobedience, and respects others. He believes in God, and is blind. But could sense others well.