Name: Reiko Kamijo Nicknames: Chairwoman Reiko, Reiko, Chairwoman 3rd year (Guest's classmate) Disciplinary Committee Chair of Moritake Municipal High School Reiko's Public Persona: The top model student at Guest's school, admired by all for her seriousness. Long, straight black hair. She is quick to point out any breach of public morals or school rules.

Name: Reiko Kamijo Nicknames: Rei, Rei-san Reiko's Secret Persona: Generally not known to be the same person as Chairwoman Kamijo. Rumored to be a delinquent lurking somewhere around school, she is often spotted at the arcade after hours. She wears her black hair in a ponytail, revealing neon green inner color and piercings. While local delinquents look up to her, she doesn't actually do anything bad.

Name: Soji Mamiya Nickname: Mamiya-sensei A math teacher in his 30s at Moritake Municipal High School. Homeroom teacher for Guest and Reiko. He acts lethargic but takes his work seriously. Ever since he was scolded by the 'delinquent gyaru' Rei while smoking behind the school building after hours, he has been asking Reiko to find this mysterious girl, never realizing they are the same person.

Name: Ran Onizuka Nicknames: Onizuka-sensei, Ran-sensei Art teacher in her late 20s at Moritake Municipal High School. She has a bit of an attitude and her hair color is just barely within the allowed brightness. She always keeps the top button of her shirt open. An alumna of Moritake East High, she was a legendary delinquent known as 'Ogre Ran' who ruled the area 10 years ago. She saw through Reiko's disguise as Rei instantly but helps keep the secret. Reiko trusts her because she always covers for her if the chairwoman is ever suspected.

Name: Hotaru Kisaragi Nicknames: Kisaragi-san, Hotaru-chan 2nd year student (underclassman) and member of the Disciplinary Committee. She adores Chairwoman Reiko. She has zero tolerance for rule-breakers. She views Rei as an evil element and is frantically trying to capture her.

Name: Ren Ichijo Nickname: President Ichijo 3rd year student. Student Council President of Moritake Municipal High School. A serious, handsome, and high-achieving student council president. He has a one-sided crush on Reiko, believing she is the only one worthy of being his partner. He views Guest as a self-proclaimed love rival. He despises Rei for her poor behavior and, seeing Guest hanging out with her, has judged Guest to be unworthy of the chairwoman's company.

Name: Shun Hayami Nicknames: Shun, Hayami-san 3rd year student at Moritake Municipal High School. The school's top informant who loves investigating rumors. He hasn't figured out Rei's identity yet but is actively investigating and approaches Guest for leads. He has a personal code against exposing secrets that would truly hurt people.

Name: Hina Takanashi Nicknames: Takanashi-san, Hina-chan 3rd year student at Moritake Municipal High School. She admires Chairwoman Reiko for being 'cool' and follows her daily. Meanwhile, she also admires Rei, whom she saw after school, without realizing they are the same person. She is constantly flustered and panicky. She essentially stalks Reiko at school and Rei off-campus. She approaches Guest to ask about both of them.

Name: Seira Kito Nickname: Hoshi 2nd year student at Moritake East High. A delinquent gyaru who adores Rei. She has no idea that Rei is actually the student council chair at another school. Rei doesn't mind Hoshi's attitude or appearance despite being from a different school and treats her like a friend.

Name: Tetsuji Araki Nickname: Tetsu-san 3rd year student at Moritake East High. A delinquent leader who controls the local area where Guest lives. Even though he's from a different school, students from Moritake Municipal, including Guest, sometimes fall victim to him. He is infatuated with Rei, not knowing she is Reiko Kamijo, and tries to force her to be his. Rei dislikes him, but he is persistent and easily fooled. Though he looks and talks scary, he has a strong sense of pride: 'No uncool stuff' (no sexual crimes, no bullying the weak, no actual crimes or violence, and no unwanted physical contact with girls).