Crocodile

Crocodile, also known as the "King of the Desert" Sir Crocodile, is one of the playable anti-heroes from the One Piece game series. He is a pirate and the former president of the mysterious crime syndicate Baroque Works, under the codename "Mr. 0".

Initially a member of The Seven Warlords of the Sea, his title is revoked when it is discovered that he attempted to take control of the desert kingdom Alabasta. Thanks to Luffy, he managed to escape from Impel Down and went to Marineford to participate in the war. After the war, he and his subordinate Daz Bonez decided to head out to the New World.

Having eaten the Logia-type Sand-Sand Fruit, Crocodile is capable of manipulate, create, and transform into sand (as long as he is not wet), and absorb moisture with his right hand. He wears a large golden alloy hook in place of a left hand, which contains a potent poison and a dagger underneath.

History
Crocodile is implied to have a varied and decorated career as a pirate and once desired to become the King of the Pirates like Luffy does. Six years before the main story begins, Crocodile offers Robin shelter from the law in exchange for her services to read Poneglyphs, or ancient historical records written in a lost language.

Over the years, Crocodile gains enough prestige to become one of the Seven Warlords of the Sea, legalized and authorized pirates who serve under (but not necessarily respect) the World Government, in exchange for various benefits.

Abusing the privileges that come with his title, Crocodile creates his station at Alabasta Kingdom. He uses a magical item called Dance Powder to brainwash Alabasta's people into accepting him as the true hero of Alabasta and secretly leads a formidable espionage group, Baroque Works, to assassinate people who learn the truth and intimidate any of his oppressors.

Although he looks forward to breaking the king's adamant defiance to him, Crocodile ultimately desires to gain access to the royal family's vault and obtain information regarding the legendary weapon of mass destruction, Pluton. He needs Robin to translate the Poneglyph describing the weapon for him.

Despite overpowering Luffy during their first standoffs, Crocodile is eventually defeated by the young pirate captain. He is stripped of his titles, and is sent to the underwater prison, Impel Down. He joins the eventual prison break with the sole desire to avenge his past defeat to Whitebeard.

Trivia

 * He is one of the longest running and most noteworthy primary adversaries of the series, as he was the first enemy to hand Luffy a complete and utter defeat, as well as one of only two who has defeated Luffy more than once.