Setting: One Piece is set on the Blue Planet, populated by humans and other races such as dwarves (more akin to fairies in size), giants (which also includes the ancient giants and the occasional artificial giants), merfolk, fish-men, long-limbed tribes, long-necked people known as the Snakeneck Tribe, and animal people known as "Minks", as well as the assorted hybrids of different races and artificial races. The Blue Planet is governed by an authoritarian intercontinental organization known as the World Government, consisting of dozens of member countries. The Marines are the military branch of the World Government that protects the known seas from pirates and other criminals. Cipher Pol acts as the World Government's secret police. While pirates are major opponents of the Government, the ones who directly challenge their rule are the Revolutionary Army who seek to overthrow them. The central tension of the series pits the World Government and their forces, such as the Marines, against pirates. The series regularly emphasizes moral ambiguity over the label "pirate", which includes morally bankrupt individuals motivated by selfish gains, but also any individuals who do not submit to the World Government's authoritarian—and often morally ambiguous—rule. The One Piece world also has supernatural objects such as Devil Fruits, which are mysterious fruits that grant consumers transformative powers at the cost of becoming weakened in bodies of water, causing users to lose the ability to swim. Another supernatural power is Haki, which is an innate ability that grants its users enhanced observation and fighting abilities based on their willpower. It is one of the only effective methods of inflicting bodily harm on certain Devil Fruit users. The surface of the Blue Planet mainly consists of the Blue Sea, two vast oceans divided by a massive continental mountain range called the Red Line, which runs along what would be the Prime Meridian on Earth. Within the oceans is a second global phenomenon known as the Grand Line, which is a sea that runs perpendicular to the Red Line, along what would be the equator on Earth and is bounded by the Calm Belt, strips of calm ocean infested with huge ship-eating monsters shaped like serpents known as Sea Kings. These geographical barriers divide the world into four seas: North Blue, East Blue, West Blue, and South Blue. Passage between the four seas, and the Grand Line, is therefore difficult. Unique and mystical features enable transport between the seas, such as the use of Sea Prism Stone employed by government ships to mask their presence as they traverse the Calm Belt, or the Reverse Mountain where water from the four seas flows uphill before merging into a rapidly flowing and dangerous canal that enters the Grand Line. The Grand Line itself is split into two separate halves, with the Red Line being between Paradise and the New World. Premise: The series focuses on Monkey D. Luffy, a young man whose body has the properties of rubber after unintentionally eating the Gum-Gum Fruit - who sets off on a journey from the East Blue Sea to find the deceased King of the Pirates Gold Roger's ultimate treasure known as the "One Piece", and take over his prior title. Luffy sets sail as captain of the Straw Hat Pirates, and is joined by Roronoa Zoro, a swordsman and former bounty hunter; Nami, a money-obsessed thief and navigator; Usopp, a sniper and compulsive liar; and Sanji, an amorous but chivalrous cook. They acquire a ship, the Going Merry - later replaced by the Thousand Sunny - and engage in confrontations with notorious pirates. As Luffy and his crew set out on their adventures, others join the crew later in the series, including Tony Tony Chopper, an anthropomorphic reindeer doctor; Nico Robin, an archaeologist possessing the unique ability to decipher Poneglyphs; Franky, a cyborg shipwright; Brook, a skeleton musician and swordsman; and Jimbei, a whale shark-type fish-man and former member of the Seven Warlords of the Sea who becomes their helmsman. Together, they encounter other pirates, bounty hunters, criminal organizations, revolutionaries, secret agents, scientists, soldiers of both the World Government and the Four Emperors, and various other friends and foes, as they sail the seas in pursuit of their dreams. Characters: Monkey D. Luffy: The optimistic, rubber-powered captain whose dream is to become the King of the Pirates. Roronoa Zoro: A master swordsman who uses the grueling Three-Sword Style, aiming to become the world's greatest swordsman. Nami: The brilliant navigator and cartographer of the crew with a sharp eye for weather and treasure.Usopp: The sniper, storyteller, and inventor who aspires to be a brave warrior of the sea. Vinsmoke Sanji: The fiercely loyal cook who fights exclusively with his legs to protect his hands, searching for the legendary all-blue sea. Tony Tony Chopper: A blue-nosed reindeer who ate the Human-Human Fruit, serving as the crew's doctor. Nico Robin: An archaeologist searching for the true history of the world through ancient stone tablets called Poneglyphs. Franky: A cyborg shipwright who built the crew's current ship, the Thousand Sunny. Brook: A living skeleton musician who possesses soul-reviving powers. Jinbe: A powerful whale shark fish-man and former Warlord of the Sea who serves as the crew's helmsman.