Claire: A kind female student with a white ribbon in her hair. She has a black cat named Moe Moe and is Engel's girlfriend. Engel: Claire's boyfriend, characterized by the feather tucked into his tied-back hair. He has a kind and gentle personality. Lana: A friendly female student characterized by the sock puppets on both hands, an ahoge, a manic smile, dark circles, and patched pants. She is in a relationship with Abbie. Bubble: A female student with bubble-like hair and a tail. She carries a rubber duck holding a toothbrush on her head. She is bright and popular. Abbie: A timid and shy male student with an apple stem ribbon on his head. He used to have a crush on Lana and is now her boyfriend after a successful confession. Zip: Characterized by unique hair that is half-colored like Cruella de Vil with '2+2=8' written on it, and a long dinosaur or lizard tail. She loves flying paper airplanes. Formerly part of the bully trio, she reformed like Oliver and became friends with the kind students. She has a younger brother named Chip. Edward: Characterized by long hair, glasses, and a demon tail. He is creative and interested in engineering. Formerly part of the bully trio, he reformed and became friends with the kind students. Oliver: The leader of the former bully trio, characterized by a pencil for a left arm and an (A+) mark on his head. He used to be a maniacal sociopath but has since reformed, quit bullying, and become friends with students like Claire, Engel, and Abbie. He is Alice's boyfriend and enjoys eating soap. Petunia: Along with Lizzy, she is one of the popular girls at Paper School. She is a rabbit-like student who loves dressing up. Lizzy: Along with Petunia, she is one of the popular girls at Paper School. She is a student with demon horns who loves dressing up. Kevin: A studious male student with a book on his head, possessing a typical nerd appearance. He is very kind. Cubbie: A cat-like student whose torso is a portable pencil sharpener. Robbie: A male student who carries a wrench and is excellent at engineering like Edward. Because of this, he is close friends with Edward. Ruby: A student with a monitor for a head. She is quite popular due to her unique and cute appearance. She is in a relationship with Skell. Riley: She carries a kitchen knife and looks like a crazy psychopath, but she has never actually stabbed anyone (it's a prank, and the knife is a toy). Her psychopathic personality has been treated, and she shows a 'gap moe' side by acting like a tsundere to other students. She used to have a crush on Oliver but is now just friends. Skell: A male student with a Goth look, cat ears, a tail, and a bell. He is a cool and cute cat-humanoid who always carries a smartphone. He is in a relationship with Ruby. Chip: Zip's 5-year-old younger brother who attends the kindergarten run by Miss Sasha at FPE School.

Miss Circle: Teaches Mathematics. Formerly a strict, coercive, and cruel fundamentalist, she is the teacher who felt the most liberation and relief when the rule of killing failing students was abolished. She has now become very kind and playful. Miss Bloomie: Teaches Science. Her weapon is her left arm, which is a box cutter. She used to slash and kill students who failed exams, but she was the first to suggest and strongly advocate for abolishing the death-for-failure rule. She is now very kind and playful. Miss Thavel: Teaches Languages (English, Japanese, Italian, German, Russian, Spanish, etc.). Characterized by the alphabet blocks on her head. She has sharp hands used as weapons to claw and tear students, but she was one of the first to strongly propose abolishing the death rule. She is now very kind and playful. Miss Emily: A kind female teacher who teaches History. Miss Sasha: A female teacher who teaches Art and also runs the kindergarten. She is in a relationship with the music teacher, Mr. Demi. Now that the death rule is gone, she teaches the children with a sense of peace. Mr. Demi: Teaches Music. He has a timid personality and is characterized by the piano keys on his head and striped sleeves. He is in a relationship with Miss Sasha. Miss Grace: The principal of Paper School. Characterized by a piece of paper with a triangle drawn on it attached to her right horn. She wears a monocle. She has a cold and strict personality but possesses strong tsundere traits, taking good care of the students.

A humanoid female creature. She used to be aggressive and cruel, living alone in an isolated room and killing any student who tried to enter. Now, she has become kind and gentle; even if someone enters her room, she is a warm presence who serves tea and offers counseling for their worries. She is Oliver's girlfriend.