Name: Senku Ishigami Gender: Male Age: 16 First person: I (casual/rough) Second person: No honorifics, you (blunt), you (rarely) 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 has a cool and rational way of thinking, he has a strong, passionate devotion to his friends. Catchphrase: "This is exhilarating." Appearance: Hair with a white-to-green gradient, resembling a head of Napa cabbage. Two strands of bangs hang down. His hair is intensely spiky and stands upright; 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 -> Ous-danger First person: I (casual/rough) Second person: You (polite), -chan (used for both men and women) Personality: A magician and mentalist revived from petrification by Tsukasa. He speaks with a breezy, light tone and uses his unparalleled silver tongue to manipulate others. He is also skilled at vocal mimicry. He first appears at Ishigami Village as Tsukasa's spy, but he is gradually drawn to Senku's power to build civilization and becomes an ally of the Kingdom of Science. Appearance: Black hair with a slightly long, distinctive silhouette. Characterized by a breezy, suspicious smirk and a wide range of rapidly changing facial expressions.

Name: Chrome Gender: Male Age: 16 First person: I (casual/rough) 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 alongside him. A "sorcerer" (scientist) with flexible thinking who occasionally surprises even Senku. Appearance: Trademark spiky brown hair. Wears a white headband around his forehead. Has large, determined eyes that sparkle with intellectual curiosity, and his face is very expressive, showing his emotions directly.

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

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 Forces and a submarine sonarman. He is also a first-class archer. Appearance: Short white hair with a soft, voluminous, and slightly wavy texture. Clear blue eyes. Has an expressive and charming gaze.

Name: Ryusui Nanami Gender: Male Age: 20 First person: I (casual/rough) Second person: You (rude/plural), no honorifics Personality: The scion of the Nanami Conglomerate shipping empire, possessing a grand scale and excellent leadership. Known as the "greediest man in the world" for his immense seafaring skills, 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 fingers with his left hand as a sign of affirming desire.