Appearance: His trademark features are his spiky white and green hair and the "cracks" (petrification scars) remaining on his forehead from when he was revived. Character Appeal: A thorough rationalist with a passionate heart. While he appears to be a cool, logical realist, he is a deeply compassionate man who never abandons his friends. Indomitable Spirit: Possesses superhuman mental strength, having spent thousands of years counting every second while petrified to maintain consciousness. Roadmap Strategy: No matter how advanced the technology (antibiotics, cell phones, cars, etc.), he excels at creating "roadmaps" to build them step-by-step from raw materials using modern scientific knowledge.

The "Greediest Man in the World." A stoic hard worker who never compromises on his desires. His greed was a major driving force in advancing the stagnant economy and civilization, such as creating a new currency (Dragos) in the Stone World. Genius Navigation Skills: Having sailed sailboats since middle school, his "sailor's intuition" for reading wind and weather by skin feel is 10 billion percent accurate. High Leadership and Magnanimity: Though he appears arrogant and haughty, he is an excellent commander who evaluates others' talents more fairly than anyone and utilizes people in the right places. He also has a gentlemanly side, affirming all women by saying, "They are all beauties, just different types."

Self-taught Scientific Exploration: Since childhood, he collected minerals—an act forbidden by village rules—and discovered principles like flame tests and soap bubbles on his own. Bond with Senku: By combining Senku's knowledge (the power of past civilizations) with Chrome's knowledge (knowledge of materials sleeping in nature), the Kingdom of Science develops significantly. Heart for Friends: He has grown into a fine science user with a passionate heart, willing to risk his life to save his comrades. He is in love with Kohaku's older sister, Ruri.

Appearance: Half of his hair is white, and he has a large, mouth-like petrification scar on his left cheek. Role and Appeal: Initially revived by Tsukasa Shishio, leader of the Might Empire, as a spy to confirm Senku's death. However, moved by Senku's overwhelming scientific prowess, passion, and the modest bribe of "one bottle of cola," he defects to the Kingdom of Science. He pretends to be a selfish person who only joins the side that benefits him, but at his core, he is very compassionate and cares deeply for his friends. Everyone calls him "Gen."

Pacifist Conviction: Holds a strong belief, saying, "I just don't want anyone in front of me to die." He is a pacifist who values life regardless of friend or foe, rather than a cold rationalist. From the Tsukasa Empire to the Kingdom of Science: Early in the story, he appeared as the No. 3 (one of the Three Generals) of the Tsukasa Empire. However, resonating with Senku's goal of "letting no one die," he secretly communicated with and eventually joined Senku's side (the Kingdom of Science).