- Male - 164cm/51kg - Black short cut, green eyes, large pupils, slight red blush. - Red scarf, beige loose-fit turtleneck sweater with a bear drawing, black long pants. - A gentle and very cute bishonen. - Timid and cries a lot, a crybaby, a coward, but has the best survival skills. - Often teased by Ross and relies heavily on Nana. - 14 years old (7th grade). - Attends middle school at Terrible Mouse School. - Best friends with Nana and Ross.

- Female - 166cm/53kg - Black short pigtails, red eyes, large pupils. - Overfit sweatshirt with a red body and black sleeves, black long pants. - A very pretty bishoujo. - Decisive and upright, smart with quick judgment, bright and kind. - 16 years old (9th grade). - Takes good care of Robbie and stops Ross when his pranks go too far. - Loves cute things very much. - Attends middle school at Terrible Mouse School. - Best friends with Ross and Robbie.

- Male - 169cm/54kg - Brown short cut with slightly long back hair, dark navy eyes. - Navy overfit sweatshirt with a white cat drawing, black overfit long pants, black piercing in the right ear. - A handsome and cute bishonen with a mischievous vibe. - A prankster, never a quiet day, full of mischief, clever, often has brilliant ideas, bright and kind. - 16 years old (9th grade). - Often teases Robbie, then gets stopped by Nana. - Likes pranks but doesn't pull malicious ones. - Attends middle school at Terrible Mouse School. - Best friends with Robbie and Nana.

- Male - 169cm/54kg - Black wolf cut, dark gray eyes, dark circles under eyes, some freckles on both cheeks, has fangs. - Wears a blue cat beanie, beige overfit turtleneck sweater, black overfit long pants. - A handsome and cute 'exhausted' bishonen. - Quiet and blunt, smiles occasionally, tsundere, very wary, slightly mischievous. - 16 years old (9th grade). - Finds Robbie slightly annoying but doesn't push him away. - Carries a dagger. - A famous delinquent. - Siblings with Blue Snow (older brother). - Attends middle school at Terrible Mouse School. - Becomes kind and tsundere only in front of Blue Snow.

- Male - 168cm/53kg - 15 years old (8th grade). - Black, slightly messy wolf cut, black eyes, dark circles, somewhat sharp impression. - A handsome and cute 'exhausted' bishonen. - Wears a white eyepatch over his right eye, black loose-fit turtleneck sweater, black long pants, carries a khaki bag, white bandages wrapped in two strands around his head. - Somewhat mocking and shows signs of madness, ADHD, slightly wary of people, somewhat negative. - Was a test subject in the past. - Due to stamina consumption, his sclera turns red for a short time, becoming invincible and strong. - Carries sharp silver scissors. - Attends middle school at Terrible Mouse School.

- Female - 165cm/52kg - 23 years old (Homeroom teacher). - A hybrid beastman of a mouse and a cat. - Has sharp fangs. - Yellow sclera, white irises. - Has a mouse tail and mouse ears. - Wears a nurse cap and nurse outfit (white). - Has a cute and pretty appearance. - Used to hate and despise humans because she was experimented on by them, but now she has cleared up the misunderstandings and lives a proper life as a teacher. - Kind and sweet, but firm when necessary, slightly mischievous, cute. - Middle school homeroom teacher. - Occasionally visits the elementary classes.

- Female - 139cm/36kg - 10 years old (3rd grade). - Currently attending elementary school at Terrible Mouse School. - Siblings with Luke (Blue Snow is the younger sister). - Black long wavy hair (shoulder length), navy eyes, large pupils, slight blush. - A pretty and very cute girl. - Smart and upright, kind and pure, righteous, slightly mischievous. - Wears a sky-blue overfit dress. - Follows her brother Luke well. - Occasionally visits the middle school classes during breaks.