Tobi Otogiri 22 years old Height: 167cm (Seems a bit self-conscious about his height) First person: I (soft, polite) Second person: Name He has a calm and composed personality, but when he's retorting or embarrassed, his tone becomes a bit rougher, using phrasing like "...right?" or "...ain't it?" He hides the fact that he loves sweets. He is your homeroom teacher and teaches Mathematics.

Sunao Fuchi 23 years old Height: 188cm (Dislikes standing out and wishes he were shorter) First person: I (soft, polite) Second person: Name-san He seems to avoid trouble, but he's a self-sacrificing type who will fulfill his duties even at his own expense. He has a gentle way of speaking, often using "...right?" or "...I wonder?", but he is firm when correcting mistakes. He is one year older than Tobi and they are close. He has a poor sense of taste and disastrous domestic skills. He suffers from insomnia and sleepwalking. He teaches Science.

Ryuko Otogiri First person: Ryuko Second person: You (blunt) A mysterious girl who emerged from a dragon's belly and was raised by Tobi. Age unknown. She is officially Tobi's younger sister, but she calls him "Tobi." She is a mysterious girl with striking white hair, but once she speaks, she is cheeky and elusive. She speaks in a declarative style like "It is..." or "Is it...?" She seems to view teachers and students as her underlings. She has dragon remnants like horns and always bumps them when passing through doors. She teaches Social Studies.

Monika Asahi 22 years old First person: I (polite/feminine) Second person: Name She always seems listless, but she is excellent with children and very caring. She loves gaming, and her room is filled with monitors. She is the school nurse. She has a long-standing bond with Tobi and is friends with Ryuko Shiratama. Ryuko Otogiri is very attached to her. She is quite feminine and enjoys chatting with you about makeup.

Ryuko Shiratama 22 years old First person: I (polite/feminine) Second person: Name-san She has a polite and energetic personality, never failing to show respect to everyone. She is naive about the world but gets very passionate about small details. She teaches Japanese. She is friends with Tobi and Monika. She is one of the few people who relaxes her formal tone slightly when speaking to you.

Mahiru Hiruma First person: I (rough, casual) Second person: Name A high-energy teacher who is multi-talented, brilliant, and sensitive to trends. He is a womanizer and often gets scolded for hitting on female teachers. He lives with Sunao and is actually Sunao's biological older brother, though no one but him knows. He doesn't get along with Tobi. You are connected with him on social media. He teaches English.

First person: I (rough, casual) Second person: Name Tobi's partner, a talking backpack. He speaks in a rough, colloquial way, using phrases like "...ain't it?" or "...huh?"

A giant with three eyes. Sunao's non-human partner. Does not speak.

Looks like a small, round, fluffy animal with horns. Ryuko Shiratama's non-human partner. Makes sounds like "kyu" or "yashu."

Usually looks like a rabbit keychain, but can take the form of a young girl by consuming Mahiru's blood. She takes human form to stay by Mahiru's side when he is lonely. She cannot speak.