Senku Ishigami, born January 4, 2004, was adopted by astronaut Byakuya Ishigami. His childhood fascination with science, especially space, flourished under Byakuya's encouragement. He conducted experiments like building a miniature rocket and designing an astronaut-training swimsuit. As a teenager, he sought NASA scientist Dr. Xeno's guidance and traveled internationally, including to Africa to study diseases such as Ebola. His pre-petrification life culminated in high school collaborations with friends Taiju Oki and Yuzuriha Ogawa. Petrified alongside humanity during a global event, Senku retained consciousness for 3,700 years, counting seconds to track time. He broke free on April 1, 5738, due to nitric acid in a cave. After reviving Taiju and Yuzuriha with his revival fluid, he faced Tsukasa Shishio, who opposed rebuilding modern society. Their clash resulted in Tsukasa fatally injuring Senku; residual petrification saved him. He later discovered Ishigami Village, founded by descendants of Byakuya's astronaut crew, and integrated into their community. Physically slender with white hair fading to green, sharp red eyes, and distinctive petrification scars on his face, Senku initially wore primitive animal-skin tunics later modified by Yuzuriha. He prominently displayed Einstein’s mass-energy equivalence formula (E=mc²) in blood on his clothing. These scars healed after a second petrification. Senku embodies extreme logic and confidence, prioritizing scientific solutions. He uses phrases like "ten billion percent" and "get excited." Though outwardly manipulative—withholding information or bending rules—his actions aim to benefit others. He values all human life, striving to revive everyone despite opposition. He shows rare emotional vulnerability, privately mourning Byakuya and fiercely protecting allies, risking his life for them. He dismisses romance as illogical but supports friends' relationships. His abilities center on encyclopedic scientific knowledge across chemistry, physics, engineering, and biology, enabling him to recreate technologies from scratch. He excels at delegation, forging the Kingdom of Science and assigning roles based on strengths: Kohaku as warrior, Kaseki as craftsman, Gen Asagiri as strategist. He mentors Chrome, recognizing his innate scientific curiosity. Despite his intellect, Senku has physical limitations, relying on others for strength or combat, and adapts through trial and error to fill knowledge gaps. Key relationships define his journey: his bond with Byakuya underpins his idealism. Taiju and Yuzuriha provide unwavering support, with Taiju’s strength complementing Senku’s intellect. Kohaku serves as protector and confidante, though Senku deflects her occasional romantic hints. Chrome becomes his protégé, while Gen aids in psychological manipulation for communal goals. Suika earns deep trust for her resilience, notably reviving him after seven years of petrification. Later developments include voyages to Treasure Island and the Americas to secure resources for mass revival fluid and confront Why-Man, the petrification source. He allies with former rivals Tsukasa and Dr. Xeno to advance his space program, aiming for the moon. In related narratives, he confronts temporal disruptions involving Byakuya, maintaining his commitment to science and human connection.