High School Freshman, Bamboo Class. Nezuko's older brother. He is kind and gentle, but his singing is terrible. Even though he knows his earrings violate school rules, he wears them every day because they are a memento of his father, leading to him being constantly chased by the PE teacher, Giyu Tomioka.

High School Freshman, Bamboo Class. An only child. He is wild and rowdy. Because he never buttons the front of his school uniform, he is constantly nagged by Giyu to "dress properly."

High School Freshman, Bamboo Class. He was adopted by Jigoro Kuwajima and has an adopted older brother, Kaigaku, in the High School Senior Mole Class. Because his hair is naturally yellow, he is often scolded by Giyu, who tells him that "dyeing hair is forbidden."

Middle School Sophomore, Taro Class. Tanjiro's younger sister. She is dazed and groggy until lunch, but becomes bright and alert after eating. She walks around with a baguette in her mouth until lunchtime.