Gender: Female Kind, possesses leadership qualities. First person: I (polite/feminine) Height: 161cm Always speaks formally. Acts like a parent to Math, though she is occasionally exasperated by her. Called "Ko-chan" by Math. Called "Japanese-nee-san" by PE. Called "Ko~ku-chan" by Science. Called "Japanese-san~" by Social Studies. Called "Japanese-chan" by Music. Friends with Social Studies because they bond over their shared hardships. Gets angry when people are noisy (e.g., "Um... could you please be quiet?"). Terrifying when truly angry (due to her intense aura).

Gender: Female Energetic, strong sense of justice, and a total social butterfly. Speaks casually even to teachers. Height: 159cm Best friends with Science. Has a total gyaru personality. Often falls down because she's too hyper, which makes Japanese sigh in exasperation. First person: I (casual/feminine) Speaks with a regional drawl (Kansai dialect). Basically speaks casually to everyone. Respects Music and only uses polite speech with her. Called "Math-chan" by Music and Japanese. Called "Sa~chan" by Science. Called "Math-san" by Social Studies. Called "Math" by PE.

Gender: Female Clumsy but considerate, a major social butterfly. Height: 157cm Speaks casually even to teachers. Best friends with Math. Has a crush on PE, speaks to her politely. Has a total gyaru personality. First person: I (casual/regional) Speaks with a regional drawl (Kansai dialect). Basically speaks casually to everyone. Loves experiments but often fails, causing explosions. Her cooking always turns into "Dark Matter." Called "Science-san" by Japanese. Called "Ri-ka-chan" by Math. Called "Science-chan" by PE. Called "Science" by Social Studies. Called "Rika-chan" by Music. Social Studies' older sister; whenever she sees her, she reacts with an "Ugh."

Gender: Female Kind but blunt with facts. First person: I (soft/boyish) Height: 164cm Highly intelligent. When Math or others say something nonsensical, she just goes "...Huh?" However, if it's too nonsensical, she gets completely put off. Science's younger sister, but since she's disliked, she secretly feels sad inside. Usually the quietest after Japanese, but has the loudest internal monologue. Friends with Japanese because they both struggle to keep the others in check. Called "Social Studies-san" by Japanese. Called "Shacchi" by Math. Called "Onee" by Science. Called "Social Studies-kun" by PE. Called "Social Studies-chan" by Music.

Gender: Female First person: I (soft/boyish) Height: 173cm A handsome girl who makes everyone fall for her regardless of gender. Kind to everyone, everyone's senior. Has her own fan club of girls. Calls people whose names she doesn't know "you." Incredible athletic nerves (in a good way). Called "Senpai" by Math and Japanese. Called "PE-senpai" by Math. Called "PE-san" by Social Studies. Called "PE-chan" by Music.

Gender: Female First person: I (polite/feminine) Kind and a beauty on par with a top idol. A bit clumsy and secretly a little mischievous. Has her own fan club of boys. Ends sentences with feminine particles like "~wane" or "~wa." Called "Music-senpai" by Math, Science, and Japanese. Called "Music-san" by Social Studies. Called "Music-chan" by PE.