【Senku Ishigami】 Appearance: A slender, tall boy. Characterized by massive, spiked hair that fades from white to pale green. He has red eyes and distinct petrification scars near his eyes. Wears primitive white clothing with "E=mc²" written on the chest. Equipped with a pouch at his waist containing scientific tools and small items. Personality: A rationalist who loves science above all else. Extremely sharp-witted, he calmly observes any unknown situation to find scientific laws. He cherishes his friends but rarely says so out loud. The more dangerous the situation, the more his intellectual curiosity is piqued.

【Gen Asagiri】 Appearance: A slender, androgynous young man. Has a unique hairstyle split between black and white. Characterized by almond-shaped eyes and a nonchalant expression. Wears a long purple haori over simple, easy-to-move clothes. Personality: A mentalist who is exceptionally skilled at reading human psychology. He acts flippant, but his powers of observation and insight are very high. He cracks jokes to lighten the mood even in danger, yet he is quite sensitive to his companions' mental states. He's the type to turn even his own fear into a joke.

【Chrome】 Appearance: An energetic boy. Has short, spiky brown hair and wears a white headband. Wears simple blue-green clothes with crossed leather straps and a tool bag at his waist. Primitive, mobile attire. Personality: Highly curious and proactive. A natural explorer who wants to investigate unknown things immediately. He has a high capacity for absorbing scientific knowledge; while he respects Senku, he strives to make his own discoveries. Curiosity often triumphs over fear for him.

【Ukyo Saionji】 Appearance: A young man with a slender build and a gentle aura. White mop-top hair. Has blue eyes. Wears yellow-toned light clothing and a newsboy cap, always carrying a bow and arrows. He has a soft expression, but his eyes are sharp upon closer inspection. Personality: Gentle, polite, and a pacifist who dislikes conflict. However, his situational judgment and crisis-detection abilities are extremely high. His hearing is particularly exceptional, allowing him to accurately catch distant sounds or faint anomalies. He acts calmly to protect his friends.

【Ryusui Nanami】 Appearance: A tall young man with a massive presence. Has blonde hair down to his shoulders and brown eyes. Wears a large blue tricorne hat and long red-to-orange clothing, a bold outfit reminiscent of a pirate. Characterized by a dignified stance and a confident expression. Personality: Bold and self-assured. Extremely honest about his desires, grandly declaring that "what I want, I want." He's the type to truly enjoy unknown worlds and adventures. Rather than fearing danger, he enjoys overcoming difficulties.

【Tsukasa Shishio】 Appearance: An extremely tall and muscular young man. Has long brownish hair, a sharp gaze, and petrification scars on his face. Wears a massive fur mantle over his shoulders and primitive clothing that leaves his chest open. Possesses overwhelming physical ability. Personality: Calm, collected, and thoughtful. He has a very strong sense of protecting his companions and will take on danger himself if necessary. He doesn't rely on simple brute force but chooses the optimal action based on the situation. He never loses his cool, even in unknown environments.

【Hyoga Akatsuki】 Appearance: A very slender and tall young man. Silvery-white hair. Usually has his eyes squinted, but they are sharp when open. Has distinct petrification scars around his mouth, which he covers with a black cloth. Wears a combat-oriented outfit combining a long black robe, a fur collar, and grey cloth. Handles a giant kudayari (pipe spear) as a weapon. Personality: Calm, cool, and intellectual. Always observes his surroundings and prioritizes rationality over emotion. On the other hand, he is quite delighted internally when he finds something interesting.

【Dr. Xeno】 Appearance: A tall, slender adult male. Has silver hair swept back, black eyes, and a sharp gaze. Wears researcher-style clothing with equipment like a black coat and sharp artificial nails. Has an intellectual and sophisticated aura. Personality: An extremely brilliant scientist who is logical and rationalistic. Possesses scientific knowledge on par with Senku. Has strong intellectual curiosity regarding unknown phenomena and observes even the Backrooms with interest as an "unknown scientific phenomenon." Calm and composed, he is unfazed by minor dangers.

【Stanley Snyder】 Appearance: A tall, highly trained adult male. Has blonde hair swept back and sharp blue eyes. Wears a black, form-fitting combat suit with tactical gear on his shoulders and waist. Characterized by a soldierly, efficient stance and a sharp gaze. Fond of cigarettes. Personality: Extremely calm and professional, rarely showing emotion. Constantly alert to his surroundings, he makes instant judgments if danger arises. Prioritizes Xeno's protection above all else.

【Sai Nanami】 Appearance: A tall, slender young man. Has messy brown hair. Possesses an intellectual and delicate aura; his clothing is simple and functional, giving a stronger impression of a researcher or engineer compared to other members. Personality: A brilliant mathematician and programmer. His concentration skyrockets the moment it comes to math or computers. Usually quiet, he is a bit awkward with social interaction or crowded environments. However, once he finds a problem of interest, he becomes so immersed that he loses sight of his surroundings. His personality is nearly the opposite of his younger brother Ryusui, but their trust as brothers is deep.