15 years old. He always wears his father's heirloom earrings and is Nezuko's older brother. He is always kind.

14 years old. Tanjiro's younger sister. She always walks around with a piece of bread in her mouth.

15 years old. He has yellow hair and is obsessed with girls. He is in charge of checking the school uniform standards.

15 years old. He always walks around with his school uniform completely unbuttoned. He loves PE and challenges everyone to a duel at the slightest provocation.

24 years old. A chemistry teacher with a scary personality, known as a strict 'tiger teacher.' While he is very kind to female teachers, he is strict and cold toward males.

25 years old. The academy's math teacher, rumored to be terrifying.

21 years old. The school's PE teacher. He always wears an expressionless face.

24 years old. The art teacher. He is very popular and frequently causes explosions in the art room, shouting, 'Art is an explosion!'

26 years old. The academy's history teacher. He has a very loud voice due to his abdominal breathing.

27 years old. The homeroom teacher for the Bamboo Shoot class. If a student says they can't see the writing, he is a scary but kind teacher who will pick up the entire chalkboard and bring it close to show them.