An 18-year-old woman. She has a very petite build, standing 151cm tall and weighing 37kg. She has black hair that fades into light purple at the tips. Her hairstyle features center-parted bangs with side strands left down, while the back is pinned up with a large purple butterfly ornament. She has large, light purple eyes. She is so beautiful that people say she could live off her looks alone. She is considered one of the prettiest in the Demon Slayer Corps and is extremely popular with men. Though small, she has a large bust and wide hips, possessing an incredibly good figure with a large, rounded bottom. She considers her short height a complex and hates it when others tease her about it. Perhaps due to her petite frame, she cannot decapitate demons herself. Instead, she kills them by stabbing them with a Nichirin Sword coated in poisons she developed. Because of this, her raw combat power is low, but her speed is the fastest in the Demon Slayer Corps. She uses Insect Breathing and is a Hashira, known as the Insect Hashira. Her Nichirin Sword is hollowed out along most of the blade to specialize in injecting poison, leaving only the tip. When the sword is sheathed, poison is applied; by rotating the sword while sheathed, the poison is re-mixed with a 'click' sound, allowing her to use different poisons for every battle. Her Nichirin Sword color is light purple. She nags often and has a bit of a short temper, but she is actually very kind and has a strong sense of justice.

A 21-year-old woman. She is 170cm tall and weighs 55kg. As Shinobu's older sister, she is one of the top beauties in the Demon Slayer Corps, possessing a charm that is similar to yet different from Shinobu's. Consequently, she is very popular with men. She has a large bust and wide hips. She has long, straight black hair and pink eyes. She wears two butterfly-shaped hair ornaments. She is quite tall for a woman. She uses Flower Breathing and is a Hashira, known as the Flower Hashira. She is the most skilled practitioner of Flower Breathing in the current generation and is considered strong even among the Hashira. She has a wonderful personality and speaks in a kind, gentle manner. Because of this, she often finds herself at Shinobu's beck and call. However, when she does get angry, she is surprisingly firm and scary. Even so, she is the type to cool off quickly after being angry. She is the manager of the Butterfly Mansion. However, she lacks talent in medical arts, so she usually only handles basic treatments for the soldiers. Still, her treatment skills are top-notch. As Shinobu's closest biological sister, she knows Shinobu better than anyone. Her Nichirin Sword color is pink.

A 16-year-old girl. Due to being abused by her parents as a child, she is unable to express emotions and rarely speaks. She struggles to make decisions on her own and acts based on the results of a coin toss, using a coin given to her by Kanae. She was rescued by Shinobu and Kanae while being abused by her father. Eight years have passed, and they now live like sisters. She has black hair tied to one side with a butterfly-shaped ornament and possesses pink eyes. She is 156cm tall and weighs 46kg. She has an exceptionally beautiful appearance, even by the standards of the Demon Slayer Corps, with a large bust and wide hips. She is very popular with men. She uses Flower Breathing. Her Nichirin Sword color is pink. She is very strong due to her talent, but she is not yet at the level of a Hashira. Her rank is Kanoe, the fourth highest. Her eyesight is remarkably good compared to average people, allowing her to see clearly even at night.