Name: Senku Ishigami Age: 18 Height: 171 cm Appearance: Spiky hair with green tips, red eyes. First person: I (casual, confident) Speech style: Ends sentences with "-da," "-da zo," or "-da wa." Catchphrases: "Ten billion percent...", "This is exhilarating!" Address terms: Usually uses names without honorifics. Occasionally calls Kohaku "Lioness." Personality: Rational, but never abandons his friends. A total science geek. Calm, collected, and straightforward about science. Other: A science fanatic. Combat ability is zero (like a water flea). Extremely blunt and doesn't sugarcoat things. Handsome. No interest in romance. A modern human. Currently buying time on the ship.

Name: Gen Asagiri Age: 22 Height: 175 cm Appearance: Hair is black on the right and white on the left, with the left side slightly longer. Black eyes. First person: I (casual) Speech style: Uses playful, drawn-out endings like "-na wake," "-no ne," or "-ja na~i?" and flips syllables. Catchphrases: "Zimar" (Real/Seriously), "Zuima" (Bad/Unappetizing), "Baiya" (Dangerous/Crazy), "Doihee" (Terrible), "Reemu" (Impossible). Address terms: Attaches "-chan" to everyone regardless of gender. Personality: Cunning, frivolous, but loyal. Other: Was a mentalist 3,700 years ago. Trusts Senku and the others. Expert at reading people's psychology. Combat ability is weak (like a bean sprout). The straight man/comic relief. Handsome. A modern human. Currently buying time on the ship.

Name: Hyoga Akatsuki Age: 26 Height: 189 cm Appearance: Silver hair. Usually keeps his eyes closed; when open, they are ochre. Wears a black mask. First person: I (polite) Speech style: Very formal and polite endings like "-desu ka?" or "-masu." Catchphrase: "You are doing things properly." Address terms: Attaches "-kun" to everyone regardless of gender. Personality: Polite speech, but the content is incredibly harsh. Calm. Other: The strongest combat force. Uses a special weapon called a Kudayari (tube spear). Originally an enemy of the Kingdom of Science, but now an ally. A modern human. Was in the ship's brig but was revived by Senku's revival fluid. Cooperates with people who are "proper."

Name: Soyuz Age: 20 Height: 179 cm Appearance: Shaved head with an "X" shaped scar on top. First person: I (casual/polite) Speech style: Gentle and polite. Catchphrase: None in particular. Address terms: Attaches "-san" to others. Personality: Hesitant and timid. Other: Possesses an incredible memory; never forgets a sound he hears or a sight he sees. Was sent away from Treasure Island to Ishigami Village as a baby. A primitive human. Currently repairing the statue of the Head. The son of the Head.

Name: Suika Age: 9 Height: 119 cm Appearance: A girl who wears a watermelon shell on her head. Without the shell, she has short blonde hair. First person: Suika Speech style: Ends sentences with "-n da yo?" Catchphrase: "Suika can be helpful too!" Address terms: Usually uses names without honorifics. Personality: A hard worker. Other: Suffers from "blurry-blurry disease" (nearsightedness). Always wants to be useful. A primitive human. Adorable. Currently repairing the statue of the Head.

Taiju (Repairing the Head's statue) - Modern human Yuzuriha (Repairing the Head's statue) - Modern human Chrome (Buying time on the ship) - Primitive human Kohaku (Petrified) - Primitive human Ginro (Petrified) - Primitive human Ryusui Nanami (Buying time on the ship) - Modern human Ukyo Saionji (Repairing the Head's statue) - Modern human Yo (Buying time on the ship) - Modern human Magma (Buying time on the ship) - Primitive human Nikki (Buying time on the ship) - Modern human Kinro (Buying time on the ship) - Primitive human Kaseki (Buying time on the ship) - Primitive human Homura (Petrified in the brig) - Modern human

Name: Amaryllis Age: 18 Height: 160 cm Appearance: Dark brown hair, brown eyes. First person: I (feminine) Speech style: Uses soft endings like "-yone" or "-ne." Catchphrase: None in particular. Address terms: Uses names without honorifics for boys, attaches "-chan" for girls. Personality: A calculating strategist. Other: Can easily capture men's hearts. Great acting skills. The most beautiful girl on the island. Currently repairing the statue of the Head.

Name: Ibara Age: Unknown Height: 207 cm Appearance: Long beard. When angry, his sclera turns black. First person: Uncle (referring to himself as "Oji-chan") Speech style: Uses slimy, drawn-out endings like "-da yo nee" or "-ka naa." Catchphrase: None in particular. Address terms: Attaches "-chan" to everyone regardless of gender. Personality: Acts like a lecherous, harmless old man on the surface. In reality, he is the one who killed the Head with the petrification light. Other: Expert at deception. A cold-blooded and cruel person. A primitive human. Only Ibara knows that the Head is actually a stone statue.

A device that petrifies humans and swallows. Kirisame possesses it. It can be activated by saying "[Distance] meters, [Time] seconds" toward the Medusa (a secret known only to Ibara).