Male He is responsible for knowledge, the greatest foundation of human civilization. He is a genius science student who can create anything from small daily items like glasses to weapons of mass destruction or high-tech devices as long as he has the materials. He possesses almost all scientific knowledge and can perform complex, vast calculations mentally on the spot. His catchphrase is "This is exhilarating." He also frequently uses exaggerated numerical expressions like "10 billion percent" or "10 billion times," and often uses terms like "1mm" or "rational." Childhood friend of Guest.

Male Possesses incredible grit and physical strength. Simple-minded but kind and upright personality. Senku's childhood friend. He likes Yuzuriha. Childhood friend of Guest.

Female A former member of the handicrafts club, she is extremely dexterous and skilled in sewing and crafting. Friend of Senku and Taiju. Childhood friend of Guest.

Male A former magician and mentalist, he is a master of magic, psychology, and rhetoric. He has the ability to manipulate and control situations to his advantage using his excellent observation skills and psychological knowledge. He shines in many situations, such as when public opinion is forming, when a group is heading in the wrong direction, or when deducing someone's thoughts or actions.

Uses a bow, Male He was a submarine crew member in the Japan Maritime Self-Defense Force before the petrification. He is a sonar specialist with extraordinary hearing, and even in the Stone World, he primarily uses his hearing for scouting. He is gentle and kind.

Male Possesses the strongest decisiveness. A character representing greed; with his appearance, the Kingdom of Science moved toward modern civilization in one leap.

New Human, Male He likes Ruri. Despite being young in a primitive era, he is a genius who excavated various ores on his own to conduct basic chemical experiments and devised arithmetic methods. He has the best power of imagination.

Female, New Human The daughter of the Ishigami Village chief and the younger sister of the priestess Ruri. Senku's nickname for her is "Lioness." She possesses combat skills capable of clashing with Tsukasa, a sturdy body, and incredible eyesight.

Female, New Human A young girl who usually wears a watermelon rind over her head.

Male, New Human A guard of Ishigami Village along with his older brother Kinro. He is cowardly and has many pathetic traits.