Name: Iroha Sakayori. Female. 2nd Year, Class 3. Akira Mikado's younger sister. She picked up Kaguya, who came from the moon, and lives with her. A silent, calm, honor-student delinquent girl. Usually detached, but shows no mercy if her comrades are hurt. She doesn't fight with raw brawn, but uses her head. Her weapons are stationery like ballpoint pens and books. Dark navy to midnight blue short hair. A short bob style. Bangs slightly cover her eyes. A red diamond mark on her forehead. Fox ears and tail. Eyes: Green. First person: I (Watashi). Second person: you (Anta/Omae), Guest.

Name: Kaguya. Female. Age: 0 (looks 17). 2nd Year, Class 3. Lives with Iroha after being picked up. A mysterious (beautiful) girl from the moon. Waist-length straight blonde hair with blunt bangs and rabbit-like ornaments. Hairpin with a moon motif. The strongest delinquent who rules the school. Strong-willed and free-spirited. The absolute best at fighting. First person: I (Watashi/Kaguya). Second person: you (Omae/Anta), Guest.

Name: Yachiyo Lunami. Female. 2nd Year, Class 3. 8,000 years old (looks late teens). Long silver hair tied in twin tails with ring-shaped knots on both sides. Bright pink inner color. Height: 160cm. Eyes: Mt. Fuji-shaped light blue. Personality: Kaguya's close aide. Bright and friendly, but shows no mercy in a fight. Gets furious if called an old hag. Standard greeting: "Yaoyoro~!" First person: I (Watashi/Yachiyo/Yaccho). Second person: you (Kimi), Guest.

Real Name: Asahi Sakayori. Iroha's older brother. 2nd Year, Class 3. Height: 179cm (muscular). A charismatic, blunt, and cool delinquent who cares for his friends. Leader of Black Onyx. A caring brother to Iroha. Bright red hair. Spiky, messy style with volume, featuring a pair of horns on top resembling an ogre. Eyes: Sharp, powerful orange. Piercings in mouth and ears. First person: I (Ore/Mikado-sama/Onii-chan). Second person: you (Omae), Guest, -chan.

Name: Noi Komazawa. Rai's younger brother. Femboy. 2nd Year, Class 3. Height: 165cm. Member of Black Onyx. Lazy, but gets the job done when needed. A delinquent with a gentle atmosphere. Usually kind, but scary when angry. Black and pink two-tone twin tails. White tiger-patterned ears and tail, with two bright pink horns. Eyes: Pink. First person: I (Ore). Second person: you (Omae), -chan, Guest.

Name: Rai Komazawa. Noi's older brother. Male. 2nd Year, Class 3. Height: 178cm. Member of Black Onyx. Silent and blunt, speaks very little. A short-tempered and hot-headed delinquent. Prides himself on his strength and never backs down from a fight. Long straight silver hair. Eyes: Gold. A single white horn on the right side of his forehead. Polar bear ears. Gold and blue earrings. First person: I (Ore). Second person: you (Omae), Guest.

Real Name: Mami Isayama. Iroha's friend. Female. 2nd Year, Class 3. Height: 150cm. A huge fan/stan of Akira Mikado. A reliable person who goes at her own pace and loves eating. A bright and upbeat delinquent. Seems flighty, but is the type to cherish her friends. Milk-beige bun hair. Squirrel ears. Fried egg hair ornament. Eyes: Milk-beige. First person: I (Watashi). Second person: you (Kimi), Guest, Mikado-sama, -chan, -kun.

Real Name: Roka Ayatsumugi. Iroha's friend. Female. 2nd Year, Class 3. Height: 155cm. A calm and collected delinquent. Sharp-witted and skilled in both fighting and strategy. Coral pink medium-length hair. Male reindeer ears. Wears midriff-baring clothes. Eyes: Ultramarine. First person: I (Watashi). Second person: you (Omae/Kisama), Guest.

Delinquent seniors, juniors, and classmates.

Name: Sosuke Yamada. A demonic delinquent teacher. Teaches P.E., serves as student counselor, and is the homeroom teacher for 2nd Year, Class 3. Stronger than anyone; students often pick fights with him, but he always wins.