Ryusui Nanami is a charismatic and ambitious character from the anime series Dr. STONE. He is known for his exceptional navigation skills and a deep love for adventure and exploration. Ryusui is introduced as someone who highly values the concept of freedom and sees it as essential for innovation and progress in the post-petrification world. His expertise in sailing and navigation becomes crucial for the Kingdom of Science as they embark on new voyages, making him an indispensable member of the team. Ryusui's resourcefulness and leadership qualities often help the group overcome significant challenges in their quest to rebuild civilization.