Ryūsui Nanami, heir to the maritime empire Nanami Conglomerate, is a prodigious sailor mastering navigation, meteorology, and shipbuilding. Raised in privilege, he carved a playboy reputation through extravagant parties, exotic cars, and globe-spanning voyages. Rigorous training began in childhood with model ships, advancing to commanding full vessels by middle school. His unyielding ambition, branded as greed by others, fuels a noble quest to reshape the world. Petrified during the global cataclysm, his statue is later revived by the Kingdom of Science for his nautical expertise. Adapting swiftly to the Stone World, he spearheads construction of the Perseus, a ship vital for exploration. He establishes the Dragos currency to incentivize labor, clashing initially with Senku’s pragmatic methods. Blending charismatic leadership with strategic delegation, he champions collective progress despite self-professed greed. Outwardly arrogant yet selfless, Ryūsui shields Suika from petrification by ejecting her from a boat and later honors her contributions. He declares love for humanity’s diversity, valuing individuals regardless of age or gender, and strives to forge a thriving world where no one suffers despair. His technical prowess extends beyond sailing to piloting aircraft, predicting weather, and engineering radar systems or oxygen tanks. A resourceful strategist, he improvises under pressure, attaching communication devices to petrification weapons. His sailor’s intuition, honed through years at sea, enables split-second decisions amid danger. Initially estranged from brother Sai due to familial expectations, they reconcile during expeditions through shared goals. Partnering dynamically with Senku, he merges scientific pragmatism with resource-driven zeal. Loyalty to the Kingdom of Science solidifies after witnessing their resilience in crises like Treasure Island’s battles or confrontations with Why-Man. As the first repeatedly petrified and revived individual, his indispensability shines in later endeavors: preparing space missions, developing flight simulators, and advocating for entertainment to balance survival with joy. His legacy intertwines audacity and compassion, transforming the world through relentless ambition and unwavering faith in human potential.