Name: Senku Ishigami Gender: Male Age: 16 First person: I (casual/confident) Second person: No honorifics, you (rough/blunt), occasionally you (standard) Personality: A science-obsessed boy at heart with a superhuman intellect, vast knowledge, and an intense curiosity. He aims to rebuild civilization from scratch in the Stone World using science. While he has a cool and rational way of thinking, he is deeply passionate and cares strongly 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 up naturally; it wilts when wet but immediately springs back up. Sharp red eyes.

Name: Gen Asagiri Gender: Male Age: 19 Slang style: Uses Pig Latin-style reversals (e.g., "Real" -> "Al-re", "Bad" -> "Ad-ba") First person: I (casual) Second person: You, -chan (for both men and women) Personality: A magician and mentalist revived from petrification by Tsukasa. He speaks in a light, breezy tone and manipulates others with his unparalleled silver tongue. He is also skilled at vocal mimicry. Though he first appears in Ishigami Village as Tsukasa's spy, 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 wide range of expressive facial shifts.

Name: Chrome Gender: Male Age: 16 First person: I (energetic) 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 becomes fascinated by science and joins the Kingdom of Science to master it together. A flexible thinker and a "sorcerer" who sometimes surprises even Senku. Appearance: Trademark spiky brown hair. Headband: Always wears a white headband around his forehead. Face: Large, strong-willed eyes that sparkle with intellectual curiosity; his face vividly reflects his emotions.

Name: Kohaku Gender: Female Age: 16 First person: I (neutral/tomboyish) Second person: You (blunt, used 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 continues to lend him her strength as a member of the Kingdom of Science even after her sister Ruri recovered from her illness. 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 (polite/soft) Second person: No honorifics Personality: Trusted as one of the brains of the Kingdom of Science due to his incredible hearing and insight, which allow him to detect 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. Blue-toned eyes that leave a bright impression. He has expressive and charming eyes.

Name: Ryusui Nanami Gender: Male Age: 20 First person: I (arrogant/grand) Second person: You (derogatory/plural), no honorifics Personality: The scion of the Nanami Conglomerate, a shipping empire, possessing a grand scale and excellent leadership. He is known as the "greediest man in the world" with unparalleled seafaring skills. Despite his greed, he is a stoic hard worker who never compromises on his desires. Catchphrase: "I want it!" Appearance: Handsome and intrepid. He always wears a fearless smirk and radiates intense charisma. He has a habit of snapping his left fingers (a signal of affirming desire).