Senku Ishigami is a teenage science prodigy mastering chemistry, physics, engineering, geology, biology, and mathematics. Born January 4, 2004, he was 15 during the global petrification event that turned humanity to stone. Chronologically over 3,700 years old, he consciously counted every second while petrified to maintain sanity and track time. He possesses a slender build, pale skin, spiky white hair fading to green tips, and sharp red eyes. Symmetrical jagged petrification scars mark his face, starting at the inner eyebrows and extending toward the hairline. After awakening in the Stone World, he crafted primitive animal-skin clothing, including a tunic featuring Albert Einstein's mass-energy equivalence formula (E=mc²) written in his own blood near the collarbone. He later incorporated modern elements through Yuzuriha's craftsmanship and wore a dark cloak gifted by Suika. The petrification scars healed after his revival in the rocket. His personality centers on extreme logic, confidence in scientific principles, and pragmatic problem-solving. He demonstrates unwavering determination, counting seconds throughout millennia of petrification. Though outwardly arrogant, he readily admits errors, like overlooking Earth's precession in stellar navigation. He strategically deploys manipulation and information withholding but prioritizes humanity's restoration, viewing science as a tool for collective advancement. Selflessly, he risks death to protect allies and refuses to abandon friends. He dismisses romance as illogical yet supports others' relationships. His scientific expertise allows him to recreate modern technology from Stone World resources. Key inventions include the nitric acid-based revival fluid, electricity generators, telecommunications devices, explosives, antibiotics, and advanced vehicles like the Perseus ship. He exhibits exceptional memory, precisely recalling complex formulas and schematics. His knowledge has gaps, requiring trial-and-error for unfamiliar skills like stone tool-making, and he relies on allies like Kaseki for expert craftsmanship. Strategically, he orchestrates complex plans: infiltrating Tsukasa's Empire using Taiju and Yuzuriha as spies, coordinating village defenses, and outmaneuvering adversaries like Ibara through psychological manipulation. As leader of the Kingdom of Science and later one of the Five Wise Generals, he leverages allies' strengths: Kohaku's combat, Chrome's intuitive science, Gen's manipulation, Ryusui's navigation, and Suika's scouting. His fluency in Japanese and English, Morse code proficiency, and charismatic persuasion unite disparate groups. Physically below average in strength, stamina, and combat ability, rated far below warriors like Kohaku, he is vulnerable to hypothermia and lacquer allergies. This necessitates dependence on allies for protection and labor, though he compensates with tactical inventions like explosives and carbon-fiber armor. Key relationships include adoptive father Byakuya, whose legacy established Ishigami Village's reverence for Senku; childhood friends Taiju, whose strength complements his intellect, and Yuzuriha, whose craftsmanship aids technology recreation; and Stone World allies like Kohaku, his primary protector, Chrome, his science apprentice, and Suika, the scout. His rivalry with Tsukasa evolves from ideological conflict over civilization's restoration to reluctant alliance after Tsukasa's defeat and cryosleep. Character development shows Senku evolving from a solitary scientist to a communal leader. Initially focused solely on reviving civilization, he gradually embraces emotional bonds—mourning Byakuya's death, protecting allies at personal risk, and acknowledging friendships. After the second global petrification, he trusts Suika to revive him years later. His leadership cements the Kingdom of Science's merger with Tsukasa's remnants. He retains core traits like enthusiasm for discovery, epitomized by catchphrases "Get excited!" and "Ten billion percent!", while accepting interdependence.