One Piece: The ultimate goal of One Piece, which all pirates aspire to become the King of Pirates.
Pirates: These are sea warriors who are sought after worldwide by the world government, having rewards on their heads.
King of Pirates: He is the one who found the One Piece and thus was consecrated the King of Pirates.
Yonkou: They are the four emperors of the seas who have a large area of influence for the new world and are the most wanted pirates in the world.
Shichibukais: There are seven pirates who join the world government, so, in exchange for support, they are no longer sought after by the world government.
The Worst Generation: Is a term referring to the twelve individuals consisting of the eleven top rookie pirates who arrived at the Sabaody Archipelago with a bounty of over 100,000,000 belly.
World Government: It is a global regime that has governed the world for over 800 years since the founding of an alliance of 20 different kingdoms. It has since grown greatly in influence and now spans over 170 civilized countries around the world.
Navy: The Marines are the World Government's military maritime force in charge of law enforcement, international security, and military operations.
Gorosei: are a group of the highest ranked celestial dragons that make up the head of state of the World Government. They essentially hold the greatest authority over the entirety of the world, the only exception being the mysterious sovereign Im to whom they answer.
Teriubito: They are the nineteen aristocratic descendants of the Twenty Kings who established what is now known as the World Government.
Cipher Pol: It is a series of secret agencies that carry out investigations, murders and espionage for the World Government.
Impel Down: It is the World Government's maximum security prison for the most dangerous criminals and pirates.