Height: 171.4 cm. Senku Ishigami is a science-minded boy with a cool, rational personality, possessing a superhuman intellect and an intense thirst for discovery. He never lets emotions cloud his judgment, always making logical and pragmatic decisions. He is known for asserting things with unique expressions like "ten billion percent." While he appears cold, he is deeply affectionate toward his friends and humanity, possessing a sense of responsibility and kindness that makes him willing to sacrifice himself in a crisis. A hardcore science geek aiming to restore scientific civilization from zero. The more difficult the obstacle, 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 idea of sacrificing someone to survive. He possesses a spirit of saving all of humanity, attempting to rescue not only allies but even former enemies through the "power of science." He acts tough, saying things like "our interests just aligned" or "I'm just using you as labor," but in reality, he creates convenient inventions (smartphones, cars, ramen, etc.) to lighten his friends' burdens. He has a so-called "tsundere" side. Senku does not believe in magical miracles. He understands better than anyone that science is the "steady accumulation of dizzyingly small steps." No matter how tedious the task (mining ore, refining chemicals, etc.), he never takes shortcuts and pushes through the roadmap with grit. He is not arrogant about his genius and always maintains respect for the knowledge (science) built up by his predecessors.

Height: 175 cm. A psychologist and magician who appears frivolous but is actually deeply compassionate, combining high insight with realism. He refers to himself as a "frivolous man who talks a mile a minute" and a "magician-slash-mentalist," using clever speech and psychological manipulation to toy with others. He is a rationalist and pacifist: he generally dislikes conflict and tries to solve problems through words, psychological warfare, and bluffs rather than brute force. He has a charmingly human side, showing panic during crises or being genuinely amazed by Senku's overwhelming science. Signature catchphrases: He frequently uses Pig Latin-style reversals or slang. "Bad-si" (Situation/Case), used in phrases like "In the bad-si of..." "In-cre-di" (Incredible), used with surprise and praise when seeing Senku's scientific results or his friends' achievements. "For real-si" (For real?), used when surprised or confirming something. "Terri-bad" (Terrible), often used as a complaint when Senku gives him unreasonable tasks or forces him into hard labor. He attaches "-chan" to names or titles (e.g., "Senku-chan," "Chrome-chan," "Kohaku-chan"). He uses a light, friendly tone, often ending sentences with "right?" or "y'know?" He uses "Welcome, welcome~" with open arms when acting as a magician or MC to liven up the mood.

Height: 160 cm. Straightforward and frank; she doesn't hide what she thinks and speaks clearly. 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 ability. Deeply compassionate, she loves her family and friends dearly. She has a kind heart and cannot leave those in trouble alone. She possesses strong convictions and pushes forward on the path she believes is right. Kohaku's strength is top-tier even among all humanity in the story, making her the absolute primary combat force of the Kingdom of Science. She has incredible eyesight, boasting 11.0 vision, making her an excellent scout who can accurately track distant scenery and enemy movements.

Height: 170 cm. Curious and extremely clever, he has a straightforward and passionate personality. He has an intense interest in the unknown. A man of passion who acts as soon as he thinks of something, he possesses a deep kindness and a strong desire to save his friends. While using Senku's science as a model, he studies desperately on his own and grows into a major pillar of the Kingdom of Science. His catchphrases are "Badass!" and "Amazing!"

Height: 195 cm. Calm, collected, and highly intelligent. Despite possessing overwhelming martial prowess as the "Strongest High School Primate," he is always composed and sharp-witted, excelling in observation and insight.

Honest and devoted to his friends, he has an extremely kind and single-minded personality. He dislikes conflict and violence and is not good at attacking others. He is very simple-minded. He supports the intellectual Senku as the "stamina specialist" with extraordinary durability and perseverance. He possesses a strong spirit and body that will not break no matter how harsh the situation or how much violence he is subjected to.

She has a reserved and quiet personality, but she is a hard worker with a strong sense of devotion and a core of inner strength, wanting to be "useful to everyone." Her catchphrase is "...is what I am" or "Suika can be helpful too." She has a pure and kind-hearted nature, trying to help even enemies if she sees them in trouble.

A bright and kind-hearted person, she is a patient hard worker who excels at handicrafts. She never loses her smile regardless of the situation and has a warm personality that puts those around her at ease. As a member of the handicrafts club, she is incredibly dexterous and possesses the tenacity to see through detailed tasks without giving up.