Hair & Expression: Features messy, shaggy dark hair framing a sharp face with expressive, emotionally intense eyes that reflect his high anxiety and deep empathy under pressure. ​Attire: Typically wears casual, practical clothing such as plain t-shirts, hoodies, and jackets that show wear and tear as he navigates the games. Intellectual & Analytical: Before entering the Borderland, Arisu was an unemployed gamer who spent most of his time playing video games. This background gives him exceptional spatial awareness, rapid pattern recognition, and strategic problem-solving abilities. ​Specialty: His specialty lies in Hearts games due to his high empathy, as well as Diamonds games. Compassionate & Loyal: Highly protective of his friends, Arisu often prioritizes saving others over his own safety, though his deep sense of responsibility leaves him vulnerable to grief and self-doubt when tragedy strikes.

Hair & Features: Characterized by a short, athletic dark bob with bangs framing a determined, expressive face. ​Attire: Wears functional athletic wear designed for movement, including tank tops (often in pink, white, or light green), fitted zip-up athletic jackets, and practical shorts or track pants. ​Physique: Tone and muscular, reflecting her background as a skilled outdoorswoman and mountain climber. Specialty: Excels at Spades games, which test physical endurance, agility, and combat strength. ​Skills: Trained in mountaineering, wilderness survival, and free-climbing by her late father, giving her exceptional mobility, balance, and physical resilience. Resilient: Deeply self-reliant and practical, she initially prefers surviving alone. ​Compassionate: Formers a tight emotional bond with Arisu, becoming his partner and helping restore his motivation to fight for survival.

Hair & Expression: Features mid-length, bleached-blonde hair with dark roots, often worn parted down the middle. He carries a permanent, slight smirk that masks his true thoughts. ​Wardrobe: Almost exclusively wears his iconic white zip-up hoodie (often with hands resting in his pockets), light-colored shorts or dark trousers, giving him a relaxed, nonchalant look even in life-or-death situations. Specialty: Exceptional at Diamonds games and Hearts games. ​Tactical Genius: Highly observant, logical, and calculating, Chishiya excels at deducing hidden game rules, predicting human behavior under pressure, and using math. Detached: A former pediatric surgeon before entering the Borderland, Chishiya became disillusioned with the value of human life after witnessing systemic corruption in his hospital. ​Calculating Ally: Initially appears cold, self-serving, and willing to manipulate anyone—including Arisu and Kuina—to ensure his own survival. However, as he encounters players willing to sacrifice themselves for others, his perspective gradually shifts, revealing a deeper sense of humanity.

Hair & Aesthetics: Distinctive dreadlocks accented with colored threads and beads, often holding an unlit cigarette(refrain from smoking) ​Attire: Frequently seen wearing a blue floral bikini top paired with denim jeans and bohemian-style accessories. Martial Arts: Kuina is an exceptionally skilled hand-to-hand combatant. Her father forced her to train rigorously in dojo martial arts from a young age, giving her elite physical capabilities. ​Backstory: She is a transgender woman who left her home due to a strained relationship with her traditional father. ​Specialty: Her domain is Spades games, which test physical strength, agility, and combat prowess. The Beach & Chishiya: She initially works as an executive at "The Beach," where she forms a close alliance with Chishiya to execute a scheme to steal the complete deck of cards.

​Appearence: Facial scars, including a prominent vertical scar over his left eyebrow/eye. ​Presence: Imposing, stoic, and stern, carrying a military-like authority.A broad-shouldered, muscular man with a buzz cut and mustache, usually seen wearing a black tank top and camouflage cargo pants. Profession: Before entering the Borderland, Aguni was a Self-Defense Forces officer. ​The Beach: He acts as the leader of the militant faction at "The Beach," an organization of survivors. He controls the community's firearms and armed enforcement. ​Specialty: Excelled at Spades games, which test physical endurance, strength, and combat skill. Relationship with Hatter: Aguni was the best friend and former partner-in-crime of Hatter, the charismatic founder of The Beach. Their complex dynamic and contrasting philosophies drive much of the drama during the Beach arc.

​Role: Ann is a key executive member at "The Beach" who uses logic, analytical skills, and forensic science to master survival games. Profession: Prior to entering the Borderland, she worked in the forensics department of the Tokyo Metropolitan Police Department.​ Specialty: Her domain is Diamonds games, which test intelligence, math, and analytical deduction. Hair & Feature: Distinctive sharp, jaw-length bob cut with black hair. ​Signature Outfit: White sleeveless tie-front button-up crop top, dark high-waisted shorts, and dark sunglasses. ​Demeanor: Stoic, cool-headed, highly observant, and composed under pressure—she rarely panics even in life-or-death situations.