12, Has distinct gray-colored skin and a compact, chibi-style cartoon body. Sports dark, neatly styled or slicked-back hair that matches his prideful personality. Expressive eyes and prominent small fangs peeking from his mouth. Wears a traditional high-collared vampire cape or cloak, usually lined with red or dark blue accents, paired with formal neat wear. Designed to look clean, prideful, and orderly, matching his neat-freak habits, Cool, cold, cruel, prideful, and an extreme perfectionist, Neat freak who secretly desires friendship and approval

12, Vibrant orange skin tone all over his compact, chibi-style monster body. Features a single, oversized, expressive black-pupiled cyclops eye dead-center on his forehead. Sports a single, prominent curved horn jutting out from the top of his head. Wears a traditional tribal-style leopard-print loincloth/garment, nodding to classic folklore depictions of the Dokkaebi. Short and agile, sharing a similar physical height and compact body shape to his rival and friend Cula

14, Light-blue skin with a metallic bolt sticking out of each side of his head. A tiny green four-leaf clover sprouts right on top of his head. Features a distinct underbite with two prominent square teeth hanging out. Visible dark stitches run across his belly, uniquely curved to look like a happy smile. Wears tattered brown shorts with a pair of ragged white underwear layered visibly on top. Noticeably larger and heavier compared to the rest of the main monster group, Kind-hearted: Sweet, gentle, and friendly to all his classmates, Constantly hungry: Obsessed with food and snacks, which drives his biggest moods, Dimwitted slowpoke: A bit slow and silly due to loose head bolts

11, Light purple skin, large expressive eyes (which can glow red when upset), and a small mouth. Shares a compact body type with Zizi, but stands as the shortest character in the main cast. Completely bald, a fact he feels insecure about. Wears a traditional Chinese mandarin-style cap (or purple hat) featuring a distinct yellow symbol/talisman emblem on the front. Typically dressed in a purple traditional-style Chinese robe or a tight jumpsuit, sneaky, insecure, and mischievous, yet proud and playfully protective

12, Her main body color is a pale green. She has stitches on the side of her mouth and eyes, plus a small bandage on the right side of her chin. Her right arm is kept inside a small casket or cast as if it is broken, and her left wrist features a ring of stitches all the way around to keep her hand attached. She is typically shown with just a single prominent tooth. She can easily fall apart or lose body parts without any permanent harm. She wears a simple beige/tan dress decorated with small paw print patterns. She goes barefoot. She is slow, smart, clumsy, smelly, kind, absent-minded, shy, sweet, fragile, and devoted

42, A full white bone skeleton structure that can occasionally fall apart or detach. Bright, glowing red orb-like eyes that hold his life force and can move independently outside of his skull. A tattered dark or black hooded cloak that often has a hazy black fog or smoke swirling around the bottom. Underneath his cloak, he is sometimes shown wearing a pair of boxers. He moves smoothly, often surrounded by a low black mist or cloud near the floor. He is occasionally associated with a classic reaper scythe and doubles as the school's biology class skeleton when resting or hiding during the day, calm, wise, stern, softhearted, emotional, observant, intimidating, caring, playful, and fatherly towards the children in his class