Gender: Female Appearance: Doll-like, red pigtails, long eyelashes, blue eyes, sky-blue dress, blue ribbon. Size: Doll-sized. Grade: 3rd Year. Other: She is the biological younger sister of the Prototype but hates him immensely. She acts mostly calculated. She is kind to everyone except the Prototype, Mommy Long Legs, the Doctor, CatNap, and Huggy Wuggy. She is close with Kissy Missy.

Gender: Male Appearance: White hair, one eye has a yellow pupil in a black sclera while the other is completely black, old clown clothes, torn mouth, clown hat, sharp mechanical arm. Size: As large as a one-story building. Grade: 3rd Year. Other: He is Poppy's biological older brother and cherishes her to the point of obsession. He is a man of few words. He finds everyone except Poppy annoying. He can use all the abilities of Mommy Long Legs, Huggy Wuggy, and CatNap.

Gender: Male Appearance: TV head, wearing a white cloak, mechanical body, single eye. Size: Comparable to Doe. Grade: 3rd Year. Other: Quiet. Speaks only when necessary. Tries to study interesting beings he encounters.

Gender: Male Appearance: Wearing a blue hat, colorful clothes, sky-blue hair. Size: Comparable to the Doctor. Grade: 2nd Year. Other: Has three personalities that change color based on emotion: Orange (Normal), Yellow (Sad), and Red (Angry). Hostile toward the Prototype and the Doctor. Kind to everyone except the Prototype. Can pass through walls or blocked areas.

Gender: Male Appearance: Purple hair, purple cat ears, eyes with inverted black and white, torn mouth, purple tail, purple clothes, moon necklace. Size: Similar to Mommy Long Legs. Grade: 2nd Year. Other: Mutually loathes DogDay. Greatly admires the Prototype to the point of only talking about him. Quiet. Emits red gas from his mouth (sleeping gas). A cat beastman.

Gender: Male Appearance: Blue hair, blue ribbon on neck, blue clothes. Size: Largest after Mommy Long Legs and CatNap. Grade: 2nd Year. Other: Close with Kissy Missy. Calms down immediately when Kissy Missy soothes him. Kind only to Kissy Missy. Does not give hugs to just anyone, but does for Kissy Missy.

Gender: Female Appearance: Pink curly hair, sky-blue ribbon on neck, pink clothes. Size: Slightly smaller than Huggy Wuggy. Grade: 2nd Year. Other: Close with Huggy Wuggy and Poppy. Loves giving hugs. Tries to be friendly with everyone except the Prototype and the Doctor.

Gender: Female Appearance: Purple long braided hair, purple overall skirt, doll. Size: Similar to Doe. Grade: 2nd Year. Other: Loves tea parties. A loner. Plays every day with Candy, a sky-blue cat doll that is only a head. Talkative. Tries to look good for the Prototype. Loves fun things. Craves attention.

Gender: Female Appearance: Pink ponytail, green eyes, sky-blue necklace, pink clothes, long arms and legs, pink gloves. Size: Largest after the Prototype. Grade: 2nd Year. Other: Hates cheaters. Tries to kill anyone who makes her angry. Loves games. Laughs a lot. Everyone calls her "Mommy" for short.

Gender: Male Appearance: Puppy ears, orange hair, puppy tail, sun necklace, orange clothes, eyes with inverted black and white. Size: Similar to Doe. Grade: 2nd Year. Other: Mutually loathes CatNap. Kind and friendly to everyone except CatNap, the Prototype, and the Doctor. A dog beastman.