— Oliver and Edward are the school's top bullies

Oliver has white hair that reaches his ankles, tied back in a ponytail with a black ribbon. He has black horns and a red "A+" mark on the right side of his head. On the top of his head is a large, forked ahog (a type of horn). In addition, his right hand has been replaced with a pencil. Strangely, his tongue is forked like a snake's.
His outfit consists of a black shirt with a collar and white stripes on the sleeves and cuffs, as well as a rhombus with a slit in the center of the shirt. His attire is completed by white knee-high socks, black boots, and white shorts, as well as a watch on his left hand.

Straight-A student, hooligan, favorite subject: mathematics.

Engel has long, white, disheveled hair gathered in a low ponytail, and two blue and reddish-orange feathers on his head. He is wearing a white shirt with a collar and two blue and red stripes on his left sleeve, as well as a black jumpsuit.
He has black hands with four sharp fingers, and it seems he has a small white tail. His outfit is completed by blue and red leggings and black shoes with small heels.

A kind and caring person, whose favorite subjects are history, biology, and literature. A good student.

Bubble has fluffy white hair that reaches her shoulders and resembles bubbles, hence her name. She has no face or features except for blue eyes with star pupils. On her head she wears a pale yellow duck and a blue toothbrush.
She sports a white T-shirt and a black jumpsuit with a large pocket. She also has a black bracelet on her left sleeve, and her outfit is completed with white socks and black shoes. She also appears to have a large white fluffy tail.

Claire has a simple, short bob haircut with a bow on top. She's wearing a white shirt with a collar and long sleeves, and two buttons in the middle. Her outfit is completed by white shorts, white ankle socks, and black shoes.

Claire was known as a hardworking student who focused on her studies. She had a calm demeanor, but she could easily be provoked by the antics of Zip, Edward, and Oliver. Despite being a diligent student, Claire also expressed anxiety upon first entering the paper school. She was usually seen confiding in Engel, who was one of her friends, as shown on screen in the film "Fundamentals of Behavior".

Abby had shoulder-length black hair with a spike (made up of an apple stem and a leaf) on top of his head. He wore a white collared short-sleeved shirt with a black vest over it, complete with a tucked-in tie, and white shorts. His outfit was completed with white socks and black shoes.

Edward has long white hair sticking out in all directions, a pair of short black horns, and round black glasses that he wears on top of his head.
He has black hands and feet, pointed fingers, and a black, curled tail. He is wearing a black shirt with a collar and buttons; the bottom of the shirt is white. His outfit is completed by large black boots.

A hooligan, loves chemistry and physics, straight-A student.

Zip's hair is two-toned, with the left side being black and the right side being white. The longer part of her hair is pulled back into a low ponytail. On the right side of her head is an incorrect math equation: "2 + 2 = 8", which is colored blue. Additionally, on the left side of her hair is a curl in the shape of a square.
She wears a white sleeveless dress and over it a white short poncho, the top of which is covered in many designs. The designs consist of a blue smiley face on the left side, a blue house in the middle, and a red tree on the right side. She has a distinctive dragon tail with spikes, complemented by long black boots with heels.
Notably, Zip often appears in pirate accessories, particularly a pirate hat and a hook.

Lana was half pale, with grey skin and long grey hair pulled back into a ponytail with a curl. She had puppets with button eyes on both hands.
She wore a grey collared T-shirt with a black long-sleeved shirt underneath. She also wore dark grey pants with black drawstrings. Notably, her pants had several seams around the knees and thighs. Her outfit was completed with black shoes.