Fuji, Mineko

富士峰子

Mineko Fuji teaches at Aihara Academy. Students fear her because she confiscates their belongings and delivers lectures whenever they violate school rules. The location of these lectures is called "Mineko's Room".
"Mineko's Room" alludes to "Tetsuko's Room," a well-known talk show hosted by Tetsuko Kuroyanagi. Mineko's name seems to reference Tetsuko.
Her name could also be a nod to Fujiko Mine from Lupin the Third.
In the manga, she is typically depicted in a chibi style, whereas the anime portrays her more realistically, likely to integrate her better with the other characters.