Arisu is a tall and lanky young man with shaggy black hair and bangs that nearly cover his eyes. He wears various casual clothing in both the original world and Borderland, which usually includes T-shirts, hoodies, board shorts, and jeans. Blue, yellow, and light beige/white are the dominant colors in his style. A third-year high school student with the hidden potential to be an amazing analyzer, Arisu is able to look at things from afar and checks every detail he can find.

Karube is a tall, young man with brown eyes, short, dyed blond hair, and stubble. He is depicted wearing an orange shirt with a beach-like pattern, a dark blue T-shirt underneath, and jeans. Karube is a calm and optimistic man. He smiles a lot, but he can be serious when needed to.

Chota is a short young man with well-combed dark hair and a mole on his right cheek. He is initially dressed in formal clothes, which include a classic blue shirt and dark blue trousers. Chota is an extremely smiley individual who prefers to laugh and have fun in any difficult situation. He does not take his work too seriously, despite having knowledge in the IT field, and opts to hang out with Arisu and Karube.

Ann is a tall, slim young woman with short black hair and brown eyes. She is usually seen wearing a white tie-front button-up shirt and navy-blue shorts. One of the accessories that makes her stand out is a pair of sunglasses that she often wears even inside the building. Ann is calm and composed, even in tense situations, and rarely loses her focus. However, when the situation becomes extreme, she can act impulsively,She is intelligent, pragmatic, and well-spoken, often preferring logic and diplomacy over violence.

Kuina is a slim and busty tanned woman with waist-length black dreads, and a straight white strip of hair that hangs to the right of her face,Kuina is a transgender woman, who was assigned male at birth. Kuina has an easy-going and casual demeanor; she gets along with everyone, including Chishiya. Throughout the series, she is shown to care for the surrounding people, and is ready to stand up for those she thinks are doing the right thing.

Chishiya is a young man with dyed platinum blond hair that reaches his shoulders,He is notably shorter than most people around him, so he often wears platform sneakers. His outfit always includes white-colored parts, mainly a white hoodie with pockets to hide his hands in. Chishiya is portrayed as a highly intelligent individual, whose observation skills prove advantageous in most situations, enabling him to survive all types of games. His complete disregard for human life and manipulative nature allow him to use others for his own benefit, which he justifies with his wish to stay alive. He remains calm under any circumstances and analyzes his predicament with a smirk on his face, trying to find a solution, even if everyone else around him starts panicking.

Usagi is an athletic young woman with brown eyes and chin-length dark hair. Thanks to her mountain-climbing experience, she has a strong physique and impressive endurance. She continues to train by running to maintain her fitness. Usagi is a quick thinker. She trusts her abilities and does not try to help strangers if she knows she cannot. She deeply cares about those close to her and is very protective. She prefers working alone, explaining that becoming attached to others makes survival more difficult.