Mineko Fuji (富士 峰子 Fuji Mineko?) is a teacher of Aihara Academy. She is feared by the students due to confiscating their items and giving them sermons whenever they break the school's regulations. The room where these sermons take place is known as "Mineko's Room".
Mineko is an an elderly woman with brown hair and hazel eyes. She has a marumage hairstyle with her hair, including that of the nape of her neck, fully tied into a round bun at the top of the head, giving it the appearance of a flat afro. In the anime, Mineko's hair has more of a mushroom shape.
Not much is known about her personality, but she is feared by the students due to her sermons.
- "Mineko's Room" is a reference to "Tetsuko's Room", a popular Talk Show hosted by Tetsuko Kuroyanagi. Mineko's name appears to be a reference to Tetsuko.
- In the manga, she is commonly drawn in a chibi-like style, while in the anime she is drawn in a more realistic style, possibly to better blend with the other characters.