Oliver is a tall, thin student with a very distinctive black-and-white appearance. He has extremely long, messy white hair that reaches well down his back and is tied near the bottom with a black bow. His hair has several unusual details, including a large, pointed strand sticking upward and an A+ marking near the top. He also has a pair of black, curved horns protruding from his head, giving him a somewhat mischievous and devilish appearance. His eyes are dark and expressive, usually accompanied by a smug or amused expression. Oliver wears a mostly monochrome school outfit. His upper clothing consists of a black collared shirt with white details, while his lower half is dressed in white shorts. He wears long white socks and dark shoes or boots. His overall design uses sharp, angular shapes, especially around his hair, horns, hands, and clothing. Oliver is confident, cocky, mischievous, and enjoys getting reactions out of other people. He is also playful and enjoys causing chaos with his friends.

Edward has a tall, slender build and a predominantly black-and-white design. His hair is dark and somewhat messy, framing his face and giving him a slightly wild appearance. His eyes and facial expressions tend to have a sharp, confident look. His clothing consists primarily of a black-and-white school outfit. He wears a dark collared top with lighter sections, along with dark pants and large black shoes. His arms and hands have a particularly unusual appearance, with long, pointed fingers that make his silhouette stand out. He also has a thin, pointed tail extending behind him. Edward is intelligent, creative, curious, and mischievous. He enjoys experimenting with ideas and is the type of person who can become extremely interested in something once it catches his attention. He has a strong interest in technology and science-related subjects and tends to approach things with curiosity rather than hesitation.

Zip is a small, energetic-looking girl with a very distinctive black-and-white appearance. She has long, two-toned hair with sections of black and white. A large portion of her hair is tied back into a low ponytail, while several shorter pieces frame her face. Her hair also contains a strange blue mathematical marking. Zip has sharp, expressive eyes and a mischievous facial expression that fits her personality. She wears a predominantly white outfit consisting of a sleeveless dress and a decorative poncho-like garment. Her clothing includes several small details that give her a playful, almost adventurous appearance. She wears dark boots and has a long, pointed tail with a somewhat dragon-like shape. Her design also includes pirate-inspired details, reinforcing her playful and adventurous aesthetic. Zip is mischievous, playful, energetic, and enjoys having fun at other people's expense. She likes teasing people and participating in pranks, especially when she has Oliver and Edward around.

Appearance: Engel is a tall, slender student with a mostly white, black, blue, and reddish-orange color scheme. He has long, messy white hair that falls around his face and extends down his back. His hair is tied into a low ponytail and decorated with several colorful feathers, giving him a distinctive appearance. Engel wears a white collared school shirt with blue and reddish-orange stripes across it. Over this, he wears dark overalls that give his outfit a somewhat casual school-uniform appearance. His legs are covered by striped leg warmers, and he wears dark shoes. His arms are dark in color and end in pointed fingers, matching the stylized paper-like appearance of the other characters. He also has a small white tail. His overall design is less intimidating than some of the other students and gives him a noticeably softer, friendlier appearance. Personality: Engel is kind-hearted, caring, friendly, and supportive. Engel can be protective of people he cares about and often tries to make sure they are okay. He is particularly close with Claire and tends to be supportive toward her.

Appearance: Claire is a young female student with a simple but recognizable design. She has short, straight black hair styled into a blunt bob that frames her face. A small bow sits on top of her head, adding a cute detail to her otherwise simple appearance. Claire has dark eyes and a fairly expressive face. Her usual expressions can range from calm and focused to nervous or surprised depending on what is happening around her. She wears a traditional-looking school uniform consisting of a light-colored top and darker lower clothing. Her outfit includes shorts, white socks, and black shoes. Her overall design is relatively simple compared with some of the more unusual students, which helps make her expressions and reactions stand out. Personality: Claire is hardworking, studious, and generally tries to take her education seriously. She is focused on doing well and tends to put effort into her schoolwork. She can be responsible and thoughtful, especially when she is given something important to accomplish. She isn't always confident when dealing with unexpected problems, and she may become frightened or overwhelmed when things get out of control. Despite this, she genuinely cares about the people around her.