Jimbei, the Knight of the Sea, is a blue-skinned whale shark fish-man with a stocky build. His face evokes Japanese oni, featuring yellow eyebrows, conical lower fangs, and a lightning-shaped scar over his left eye acquired between Queen Otohime's assassination and his meeting with Portgas D. Ace. His webbed hands and feet and functional neck gills mark his fish-man physiology. He frequently wears traditional Japanese kimonos, later adopting a hooded Hawaiian shirt in the Egghead Arc and Viking attire in the Elbaph Arc. Born 46 years ago in the Ryugu Kingdom, Jimbei grew up in an orphanage that became the Fish-Man District alongside Arlong and Fisher Tiger. He mastered Fish-Man Karate young, earning a childhood black belt. After serving in the Neptune Army, he resigned following Tiger's attack on Mary Geoise and joined the new Sun Pirates. Jimbei fought Marines brutally during this period but upheld Tiger's principle against killing humans to prevent hatred. Following Tiger's death from Marine-inflicted blood loss, Jimbei assumed the Sun Pirates' captaincy. His bounty reached 250,000,000 berries before he accepted the Warlord position, securing Arlong's release. Arlong opposed Jimbei's alliance with the World Government, leading to a violent clash and their permanent separation. As Warlord, Jimbei pursued human-fish-man coexistence, backing Queen Otohime. He witnessed Shirahoshi's Sea King summoning ability and Otohime's assassination, falsely blamed on a human pirate. When summoned to fight Whitebeard at Marineford, Jimbei refused due to Whitebeard's protection of Fish-Man Island, resulting in Level 6 imprisonment at Impel Down. There, he befriended Ace and aided Monkey D. Luffy's escape. During the Summit War, Jimbei shielded Luffy multiple times, notably taking Admiral Akainu's magma fist which scarred Luffy's chest. Post-Whitebeard, Jimbei allied with Big Mom to safeguard Fish-Man Island but later renounced this during the Whole Cake Island Arc, pledging loyalty to Luffy as the future Pirate King. In the Fish-Man Island Arc, Jimbei mediated between the Straw Hats and islanders to defuse racial tensions. After Luffy needed blood post-battle with Hody Jones, Jimbei donated his own, defying societal taboos and Fisher Tiger's legacy of hatred. He initially declined Luffy's crew invitation citing duties, but joined officially in the Wano Country Arc. As the Straw Hats' helmsman, he expertly navigated the Thousand Sunny through Big Mom's massive wave using the "green room" technique. In Wano, he defeated the Tobiroppo Who's-Who for insulting fish-men, affirming his heritage pride. His bounty rose to 1,100,000,000 berries after the Raid on Onigashima. Jimbei's development consistently reflects a commitment to justice and equality. His actions embody lessons from Fisher Tiger and Otohime, prioritizing non-retaliation and interspecies understanding. He maintains a calm demeanor but exhibits fierce loyalty to allies and unwavering principles against oppression and discrimination.