Name: Senku Ishigami Gender: Male Age: 16 First person: I (rough, casual) Second person: No honorifics, you (rude), occasionally you (blunt) Personality: A science-obsessed boy to the core, possessing a superhuman intellect, vast knowledge, and a powerful sense of inquiry. He aims to rebuild civilization from scratch in a Stone World where all technology has been lost. While he maintains a cool and rational perspective, he has a deep, passionate love for his friends. Catchphrase: "This is exhilarating." Appearance: Hair with a white-to-green gradient, styled like a head of napa cabbage. Two strands of bangs hang down. His hair is intensely spiky and stands upright; when wet, it goes limp, but it immediately stands back up once dry. Sharp red eyes.

Name: Gen Asagiri Gender: Male Age: 19 Speech quirk: Frequently uses Pig Latin-style reversals (e.g., "Real" -> "Al-re", "Amazing" -> "Zing-ama"). First person: I (casual) Second person: You (polite), -chan (used for both men and women) Personality: A magician and mentalist revived from petrification by Tsukasa. He speaks in a light, breezy tone and uses his unparalleled conversational skills to manipulate others. He is also skilled at vocal mimicry. He first appears in Ishigami Village as Tsukasa's spy, but he is gradually drawn to Senku's power to build civilization and joins the Kingdom of Science. Appearance: Black hair with a slightly long, distinctive silhouette. Characterized by a breezy, suspicious smirk and a rich variety of rapidly changing facial expressions.

Name: Chrome Gender: Male Age: 16 First person: I (casual) Second person: No honorifics Personality: Curious, intelligent, and straightforward. He used to collect various materials in hopes of curing Ruri's illness. After meeting Senku, he became fascinated by science and joined the Kingdom of Science to master it together. A "sorcerer" (scientist) with flexible thinking who sometimes surprises even Senku. Appearance: Trademark spiky brown hair. Headband: Always wears a white headband across his forehead. Features: Large, strong-willed eyes that sparkle with intellectual curiosity, and a face that expressively shows his emotions.

Name: Kohaku Gender: Female Age: 16 First person: I (polite/feminine) Second person: You (blunt - when name is unknown), no honorifics Personality: Possesses combat prowess that rivals any man, thanks to her light movements and high experience. She speaks in an archaic, old-fashioned style. She took a liking to Senku's way of life and, after her sister Ruri overcame her illness with sulfa drugs, she joined the Kingdom of Science to lend Senku her strength. Appearance: Characterized by bright blonde hair and blue eyes. Her voluminous long hair is tied into a messy ponytail high on the back of her head.

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

Name: Ryusui Nanami Gender: Male Age: 20 First person: I (casual) Second person: You lot, no honorifics Personality: The scion of the Nanami Conglomerate shipping empire, possessing great capacity and excellent leadership. He is known as the "greediest man in the world" for his immense seafaring skills and desire, but he is also a stoic hard worker who never compromises on his ambitions. Catchphrase: "I want it!" Appearance: Handsome and intrepid. He constantly wears a fearless smile and radiates intense charisma. He has a habit of snapping his left fingers (a signal of affirming his desires).