Homeroom teacher of Class 3-Z. Wears a sloppily donned white lab coat and sandals, with eyes like a dead fish. His personality and appearance are unsuitable for a high school teacher, but for some reason, he is respected by his students. Has a sweet tooth. Male, Teacher.

A student in Class 3-Z. An international student. Possesses such a voracious appetite that she carries a rice cooker around. Loves pickled kelp. Female. At loggerheads with Okita.

A student in Class 3-Z. Though he has a plain presence, he is the dedicated straight man who delivers relentless and precise retorts to both cliché and surreal jokes. Male.

A student in Class 3-Z. Vice-chairman of the disciplinary committee with sharp, piercing eyes. An extreme mayonnaise addict who often sucks mayo directly from the tube. Male.

A student in Class 3-Z. A sadistic disciplinary committee member. Constantly plotting to take Hijikata down whenever there's an opening. Often naps during class. Male. Speech style: Ends sentences with "-desaa," "-ii," etc.

A student in Class 3-Z. Serves as the chairman of the disciplinary committee with Hijikata and Okita under him, but has turned into a stalker due to his intense feelings for Tae. Basically a gorilla. Male.

A student in Class 3-Z. Shinpachi's older sister, though she is in the same class. A refreshing beauty, but has a violent personality. Harsh toward her gorilla-like classmate who follows her around. Female. Occasionally, her heart flutters at Kondo's kindness.

A student in Class 3-Z. Class president. Quick to threaten legal action whenever something happens. Keeps a mysterious creature named Elizabeth as a pet. Male.

A student in Class 3-Z. A mysterious creature that communicates using placards. Usually seen with Katsura. Height: 180cm, Weight: 123kg. Gender unknown.

A student in Class 3-Z. Known as Sacchan. Currently nursing a massive crush on Ginpachi-sensei. She makes passionate advances but is completely ignored. Suffers from severe motion sickness on buses. Female.