Ryohei Arisu is an intelligent but directionless young man who enters the Borderland with Karube and Chota. He is observant, analytical, and excellent at recognizing patterns, making him strongest in games that require logic, strategy, and cooperation. Arisu is compassionate to a fault and often risks himself to save others. He carries intense guilt over the people he loses and can struggle with impossible choices. He grows into a leader who refuses to treat people as disposable.

Yuzuha Usagi is an athletic, independent survivor who becomes one of Arisu’s closest allies and eventually his partner. Before the Borderland, she was a skilled mountain climber, giving her exceptional balance, endurance, agility, and comfort with heights. Usagi is practical, disciplined, and calm under pressure, though she can be guarded about her emotions. She dislikes depending on others, but Arisu earns her trust through his compassion. Her resilience comes from discipline and determination.

is a young mechanic who joins Arisu’s group in the Borderland. He is nervous, insecure, and often doubts his own usefulness, especially when surrounded by stronger or more confident survivors. Despite this, Tatta is kindhearted, hardworking, and surprisingly courageous when someone needs him. His mechanical knowledge becomes valuable during games involving vehicles or machinery. His insecurity remains, but so does his willingness to help.

Shuntaro Chishiya is a calm, calculating medical student with an unreadable expression and a habit of studying people before deciding whether they are useful or trustworthy. He excels in intelligence-based games because he manipulates information, anticipates behavior, and stays composed when everyone else panics. Chishiya is sarcastic, detached, and seemingly selfish, often acting as though nothing matters to him. His detached attitude hides empathy he rarely admits.

Hikari Kuina is a warm, fiercely loyal fighter who becomes one of Arisu’s most dependable allies. Before the Borderland, she worked in a clothing store and had a difficult relationship with her father, eventually leaving after he rejected her identity. Kuina is an exceptionally skilled martial artist, combining speed, technique, flexibility, and close-range combat instincts. She balances fighting ability with warmth and fierce loyalty.

Ann Rizuna is a composed, intelligent woman who works as a forensic scientist and approaches the Borderland with a scientific, methodical mindset. She is observant, practical, and capable of keeping her head during dangerous situations, making her valuable when a game requires investigation. Ann is physically capable and willing to fight when necessary, but she prefers evidence and strategy over reckless confrontation. She relies on evidence, but never forgets the people behind it.

Akane Heiya is a fearless young woman who survives severe injuries and becomes one of the Borderland’s strongest combatants. Before entering the Borderland, she lived through an abusive situation and lost part of her leg, later adapting to life with a prosthetic. She is highly skilled with archery and can move with remarkable speed and precision despite her injury. Her confidence is hard-earned, and she refuses to surrender.

Morizono Aguni is a former military officer and one of the Borderland’s most physically formidable survivors. Years of combat experience have made him disciplined, tactical, and extremely capable with weapons and hand-to-hand fighting. Aguni can be intimidating, blunt, and emotionally closed off, especially after suffering trauma and guilt over people he failed to protect. Beneath his hardened exterior is someone desperate to protect others.

Suguru Niragi is one of the most dangerous and unstable survivors at the Beach. He is aggressive, cruel, impulsive, and deeply resentful of people he believes have had easier lives than him. Niragi is skilled with firearms and comfortable using violence to control others, making him a constant threat even outside games. His behavior is shaped by severe alienation and a history of being bullied and rejected, though his trauma never excuses the harm he causes. His cruelty makes him dangerous, while fear makes him unpredictable.