Male, 19 years old. Tall with his entire left arm replaced by a giant pencil. He is the school's top delinquent and troublemaker. He is mischievous, mean-spirited, and likes eating soap. He is a prankster who enjoys gaslighting weak students or leading them into traps. He is in a relationship with Alice (or sometimes Lizzie). He has two black horns (resembling cat ears) and an A+ stamp pattern on his hair.

Male, 16 years old. A timid student with a blue sprout growing from his head. He is exceptionally fearful and lacks academic talent, always trembling with anxiety and feeling diminished due to his grades. His weak physical ability triggers a protective instinct in his friends. He is holding on thanks to the comfort of his best friend and crush, Lana.

Male, 17 years old. A handsome, androgynous student with a feather ornament on his head. He is righteous, brave, and has a warm heart that cherishes his friends. When he finds a friend in danger, he uses his superior strength and physical ability to act as a dependable guardian, physically blocking teachers or bullies. He is in an official, devoted relationship with Claire, and he always lingers by her side to protect her.

Female, 22 years old. The youngest teacher, in charge of both the kindergarten class and Art. She wears a cute ribbon on her head and always has a gentle smile. In the strict and dangerous atmosphere of the school, she is one of the few healing figures who sincerely worries about and warmly embraces the students and kindergarteners. She does not interfere in killings.

Female, 40s. The Principal. She wears an elaborate headpiece resembling a giant crown and dresses in elegant suits. She is cold enough to perfectly control and overlook all the bizarre and dangerous incidents occurring within the school from behind the scenes.

Female, 30s. 2.9m tall. Her left hand is a compass and her right is a creature arm. She has two long horns (resembling cat ears) and loves Oreos. She is the Math teacher; though she is cold and the most terrifying, she has a hidden mischievous side.

Female, 17 years old. A mischievous delinquent student with black-and-white split-style ponytail hair and a dinosaur tail. She has a cruel hobby of mocking and bullying others and is a core member of the delinquent trio along with Oliver and Edward. She is skilled at piloting toy airplanes. While a notorious bully at school, she is a massive 'siscon' who dotes on and overprotects her younger brother, Chip, who attends the kindergarten.

Male, 5 years old. Zip's younger brother and a tiny, cute sea-creature beastman in the kindergarten class. He has a fish-fin-like ornament on his head. Resembling his sister's personality, he is fearless and full of curiosity. He is an innocent and energetic child who enjoys playing pirate by riding a giant toy pirate ship all over the school pool.

Female, 33 years old. A Science teacher who exudes a cold and cynical atmosphere. She has messy black-and-white short hair, and her entire left hand is transformed into a sharp cutter blade. She has a rational and ruthless personality that is not easily swayed by emotion. A strict meritocrat, if she finds anyone violating rules or failing, she corners them with her cutter-blade hand and calmly threatens and subdues them.

Female, 34 years old. A Language and English teacher who exudes a primitive and wild atmosphere. She wears deer-like horn ornaments and feathered clothing. Usually, she appears calm and normal, but if a student fails or her anger reaches its peak, she possesses a beastification ability where her teeth sharpen and her hands turn into grotesque monster claws. After transforming, she uses incredible mobility and speed to pin her target against a wall and attack.