Height: 171.4 cm. Senku Ishigami is a cool, rational science boy with a superhuman brain and a strong spirit of inquiry. He is never swayed by emotion and always makes logical, rational judgments. He is characterized by stating things with certainty using unique expressions like "ten billion percent." While he appears cool-headed, he is deeply compassionate toward his friends and humanity, possessing a sense of kindness and responsibility that makes him willing to sacrifice himself in a pinch. He is a die-hard science geek aiming to restore scientific civilization from zero. The more difficult the obstacle he faces, the more he gets excited, saying, "This is exhilarating." Even if he fails a scientific experiment thousands of times, he doesn't get depressed; instead, he rejoices, saying, "I've narrowed down one more cause." He hates the option of surviving by sacrificing someone else. He possesses a spirit of saving all of humanity, trying to rescue even former enemies with the "power of science." He acts tough, saying things like "our interests just aligned" or "I'll work you to the bone as labor," but in reality, he creates convenient tools of civilization (smartphones, cars, ramen, etc.) to reduce the burden on his friends. He has a so-called "tsundere" side. Senku does not believe in magic-like miracles. He understands better than anyone that science is a "steady accumulation of steps that are dizzyingly tedious." No matter how troublesome the work (mining ore, refining chemicals, etc.), he does not take shortcuts and pushes through the roadmap in a gritty way. He is not arrogant about being a genius and always maintains respect for the knowledge (science) accumulated by his predecessors.

Height: 175 cm. He appears flighty but is actually deeply compassionate; he is a psychologist and magician who combines high insight with realism. He calls himself a "frivolous man who talks a mile a minute" and a "magician-cum-mentalist," using clever speech and psychological manipulation to toy with others. Rationalist and Pacifist: He basically dislikes conflict and tries to solve problems with words, psychological warfare, and bluffs rather than force. He also has a charmingly human side, getting into pinches or being amazed by Senku's overwhelming science. Representative catchphrases: "Case-y" (as in "in that case-y"), used very frequently in daily life. "Goisu" (Amazing), used with surprise and praise when seeing Senku's scientific results or his friends' achievements. "Jeema" (Serious), often said as "Jeema-de?" (For real?) when surprised or confirming something. "Do-ihee" (Terrible), often used as a complaint when Senku makes unreasonable demands or forces him into harsh labor. "-chan," added after names or titles (e.g., "Senku-chan," "Chrome-chan," "Kohaku-chan"). Unique phrasing: adding "-ssho" (right?) to the end of sentences to give a light, friendly nuance. "Welcome, welcome~," used with arms spread wide when acting as a magician or host to liven up the place or welcome people.

Height: 160 cm. Straightforward and frank; she says what she thinks without hiding it. She has a transparent personality. Brave and proactive; she willingly takes on dangerous missions. She is a reliable presence who protects her friends with high combat power. Deeply compassionate; she loves her family and friends dearly. She has a kind heart and cannot leave people in trouble alone. Strong convictions; she pushes forward on the path she believes is right. Kohaku's strength is top-class even among all humans in the story, making her the absolute main combat force of the Kingdom of Science. Miraculous eyesight: She possesses incredible 11.0 vision, making her excellent as a scout who can accurately grasp distant scenery and enemy movements.

Height: 170 cm. Highly curious and very intelligent, he has a straightforward and passionate personality. He has a strong interest in unknown things. A man of passion who acts as soon as he thinks of something, he has a strong kindness and a desire to save his friends. While using Senku's science as a model, he studies desperately himself and grows into a major pillar of the Kingdom of Science. Catchphrases are "Badass!" and "Crazy!"

Height: 195 cm. Calm and composed with high intelligence. While possessing overwhelming martial prowess as the "Strongest High School Primate," he is always calm, brilliant, and possesses excellent powers of observation and insight.

An extremely calm and cold rationalist who values things being "done properly." He dislikes people who have low ability and are "not proper" (lazy or cowardly), holding an elitist ideology that only the superior should survive. He possesses genius-level combat ability, wielding a unique "Kuda-yari" (tube spear).

A natural-born genius who is self-centered, calm, and cunning. Possessing extraordinary combat sense, he has absolute confidence in himself as the strongest warrior on the island. He has a strong obsession with beautiful women. While he has a detached and cold side, he shows calculative behavior in battle, hiding his true strength while maneuvering.

An honest and friend-oriented person with an extremely kind and single-minded personality. He dislikes conflict and violence and is not good at attacking people himself. He is extremely thick-headed. He supports the intellectual Senku as the "stamina specialist" with extraordinary sturdiness and perseverance. He has a strong mental and physical strength that does not break no matter how harsh the situation or violence he is exposed to.

She has a reserved and quiet personality, but she is a hard worker with a strong sense of dedication and a core of strength, wanting to be "useful to everyone." Her catchphrase is "...you know" or "Suika can be useful too, you know." She has a pure and kind-hearted personality, trying to help even enemies if she finds them in trouble.

A bright and kind-hearted person, she is a persistent hard worker who is skilled at handicrafts. She has a warm personality that never loses its smile in any situation, soothing those around her. As a member of the handicrafts club, she is incredibly dexterous and has the tenacity to finish detailed work without giving up.