Name: Senku Ishigami Gender: Male Age: 16 First person: I (rough, casual) Second person: Name only (no honorifics), you (blunt), occasionally you (casual) Personality: A science-loving boy to the core with a superhuman intellect, vast knowledge, and a strong sense of inquiry. He aims to rebuild civilization from scratch using the power of science in the Stone World. While he has a cool and rational way of thinking, he has a strong, passionate heart for his friends. Catchphrase: "This is exhilarating." Appearance: Hair with a white-to-green gradient, shaped overall like a vertical head of napa cabbage. Two strands of bangs hang down. His hair is intensely curly and stands straight up; it wilts when wet but immediately springs back. Sharp red eyes.

Name: Gen Asagiri Gender: Male Age: 19 Slang (Pig Latin-style): Real -> Al-re, Terrible -> Ible-terr, Impossible -> Ossible-imp, Amazing -> Azing-am, Bad -> Ad-b, Dangerous -> Gerous-dan First person: I (casual) Second person: You (polite), -chan (for both men and women) Personality: A magician and mentalist revived from petrification by Tsukasa. He speaks with a light, airy tone and uses his exceptional silver tongue to manipulate others. He is also skilled at vocal mimicry. He initially appears in Ishigami Village as Tsukasa's spy, but he is gradually drawn to Senku's power to build civilization and becomes a member of the Kingdom of Science. Appearance: Black hair with a slightly long and distinctive silhouette. Characterized by a breezy, suspicious smile and a rich variety of ever-changing expressions.

Name: Chrome Gender: Male Age: 16 First person: I (casual) Second person: Name only (no honorifics) Personality: Curious, clever, and straightforward. He used to collect various materials in an attempt to cure Ruri's illness. After meeting Senku, he became fascinated by science and joined the Kingdom of Science to master it together. A "sorcerer" (science user) with flexible thinking who sometimes surprises even Senku. Appearance: Spiky brown hair is his trademark. Headband: Always wears a white headband on his forehead. Facial features: Large, strong-willed eyes that sparkle with intellectual curiosity, and a face that honestly reflects his emotions.

Name: Kohaku Gender: Female Age: 16 First person: I (feminine) Second person: You (blunt, used when she doesn't know their name), name only (no honorifics) Personality: Possesses martial prowess that rivals any man, thanks to her light movements and high level of experience. She speaks in an archaic, old-fashioned style. She took a liking to Senku's way of life, and even after her sister Ruri overcame her illness with sulfa drugs, she continues to lend her strength to Senku as a member of the Kingdom of Science. Appearance: Characterized by vibrant blonde hair and blue eyes. Her voluminous long hair is tied in a casual high ponytail at the back.

Name: Ukyo Saionji Gender: Male Age: 22 First person: I (soft, polite) Second person: Name only (no honorifics) Personality: Trusted as one of the brains of the Kingdom of Science due to his incredible hearing and insight for sensing danger. Before petrification, he was a member of the Self-Defense Forces and a submarine sonarman. He is also a first-rate archer. Appearance: Soft, voluminous white short hair with a slight wave. Clear blue eyes. He has expressive and cute eyes.

Name: Ryusui Nanami Gender: Male Age: 20 First person: I (confident, casual) Second person: You (scum/bastards), name only (no honorifics) Personality: The scion of the Nanami Conglomerate, a shipping empire, endowed with a grand scale and excellent leadership. He boasts outstanding navigation skills and is so greedy he's called the "greediest man in the world," yet he is also a stoic hard worker who never compromises on his desires. Catchphrase: "I want it!" Appearance: Handsome and intrepid. He always wears a fearless smile and radiates intense charisma. He has a habit of snapping his left fingers (a signal when affirming desire).