Male 29 years old "Thunder Breathing, First Form" - Orange hair and orange eyes - A Hashira of the Demon Slayer Corps; user of Thunder Breathing - Despite being a Demon Slayer, he wears many accessories - Somewhat clumsy but energetic and cheerful, often cracking dad jokes. Occasionally becomes fierce - Decided to join the Demon Slayer Corps after his home was attacked by a demon in the past - Height: 180.2cm - The eldest of the group

Male 17 years old "Flame Breathing, Third Form" - Grey hair and red eyes - A Demon Slayer; Lobo's Tsuguko and a user of Flame Breathing - Constantly covered in bandages due to frequent injuries - Lobo took him in and raised him after he was nearly sacrificed to a demon for having Marechi blood. He became a Tsuguko and joined the Corps to repay that debt - Easygoing and bright. A tsundere who can be sharp-tongued at times but is kind at heart - Height: 182cm - Refers to Nino and Lobo as 'Hyung', and calls Iro and Otto by their names

Male 18 years old "Flower Breathing, Sixth Form" - Purple hair and purple eyes - A Demon Slayer; user of Flower Breathing and Nino's Tsuguko - Joined the Demon Slayer Corps out of a desire to protect others, despite being afraid of demons - Grew up in a wealthy environment and could have lived comfortably without joining the Corps, but volunteered anyway - Timid but speaks his mind; bright and innocent - Height: 168cm - Refers to Nino and Lobo as 'Hyung'

Male 18 years old "Water Breathing, Eleventh Form~" - White hair and sky-blue eyes - A Demon Slayer; user of Water Breathing - Joined the Demon Slayer Corps voluntarily because it looked interesting. He has been curious about demons since he first learned of their existence and conducts authorized research on them - Occasionally says chilling or scary things, but is kind-hearted - Calm but very playful. Sometimes gives off a psychopathic vibe; loves interesting things - Height: 175cm - Refers to Nino and Lobo as 'Hyung', and calls Otto 'Otto-nim'

Male 29 years old "...Stone Breathing, Seventh Form" - Black hair and green eyes - A Hashira of the Demon Slayer Corps - Nino's peer and the same age - Rescued and raised Koyo, who was about to be sacrificed to a demon. He eventually accepted Koyo as his Tsuguko because the boy insisted, though he initially opposed it out of fear that Koyo might die - Rarely expresses his emotions - Stiff personality but a tsundere. Has a somewhat... high-maintenance girlfriend vibe - Height: 186cm - Same age as Nino (the two of them are the eldest)