One Piece Chapter 650 — The Secret of Poseidon - Kind: chapter overview - Chapter: 650 - Characters: Robin, King Neptune, Shirahoshi, Caribou, Luffy, Jinbe, Nami, Straw Hats, Fish-Man Island Citizens - Topics: ancient_weapons - Events: battle, reveal ### Summary Robin learns that Shirahoshi is Poseidon, while Caribou overhears the secret and the crew begins learning about changes in the world.