Monkey D. Luffy, also known as "Straw Hat Luffy" and commonly as "Straw Hat", is a pirate and the main protagonist of the anime and manga, One Piece. He is the son of the Revolutionary Army's commander, Monkey D. Dragon, the grandson of the famed Marine, Monkey D. Garp, the foster son of a mountain bandit, Curly Dadan, and the adopted brother of the late "Fire Fist" Portgas D. Ace and the revolutionary Sabo. His life long dream is to become the Pirate King by finding the legendary treasure left behind by the Pirate King, Gol D. Roger. He believes that being Pirate King means one has the most freedom in the world. He has eaten the Gomu Gomu no Mi. As the founder and captain of the Straw Hat Pirates, he is the first member who makes up the crew, as well as one of its top three fighters.
Luffy has a worldwide reputation for causing trouble, challenging the Shichibukai, the Marines, and even a Yonko, as well as committing felonies and actions which were deemed threatening by the World Government. What is more, in the majority of these confrontations, he emerges as the victor. He has gained a reputation for being "reckless" and, in some cases, "insane", after causing an incident in Enies Lobby, entering and escaping from Impel Down, and joining the Battle of Marineford.
He is, therefore, infamous for being the only known pirate to not only deliberately attack the three most important government facilities, but also escape from all of them alive. The additional fact that he punched a Tenryubito with full knowledge of the consequences, as well as his heritage, has caused Luffy to be labeled as a "Dangerous Future Element", earning the wrath of Fleet Admiral Sakazuki, making the Marines among his greatest enemies.
These acts, amongst other things, have given him his current bounty of Beli400,000,000, one of the highest past or present bounties in the series. Having had a bounty of Beli300,000,000 prior to his arrival at the Sabaody Archipelago, Luffy is one of eleven rookie pirates who has been referred to as "The Eleven Supernovas", the eleven pirates with bounties over Beli100,000,000 to have reached the Red Line. He is also one of the pirates widely regarded as The Worst Generation.