The CP9 are extremely important characters in the One Piece world. Introduced to the fans in the Water 7 saga, the CP9 were revealed to be a unit of the Cipher Pol intelligence agency of the World Government. As the CP9 specialized in assassination, on top of information retrieval, they were sent to Water 7 to infiltrate the Galley La Company and retrieve the blueprints of Pluton, an Ancient Weapon.