Monkey D. is a fictional character and the main protagonist of the One Piece franchise created by Eiichiro Oda. He is introduced as a boy who gains the properties of rubber after inadvertently eating a supernatural fruit, and also possesses superhuman strength.
One Piece revolves around Luffy's exploits in searching for the world's ultimate treasure known as the One Piece and becoming the next Pirate King. Throughout these adventures, he meets many others who share similar goals, organizing a diverse crew known as the Straw Hat Pirates. As Luffy's exploits are revealed to the World Government, he becomes one of the strongest pirates and protects his crew from villains who wish to harm him and his friends. Luffy is depicted as carefree when at ease, but is quick to become serious in a fight. Luffy is able to concentrate his strength and power from his body to use attacks, the most prominent being his signature Gum-Gum Pistol, in which Luffy launches a punch attack.
As the protagonist, Luffy appears in most of the episodes, films, television specials, and OVAs of the anime series One Piece, as well as several of the franchise's video games. Due to the series' international popularity, Luffy has become one of the most recognizable and iconic anime characters. Outside of the One Piece franchise, Luffy has had an appearance in the crossover manga Cross Epoch. He has also been the subject of other parodies, and has appeared in various special events throughout Japanese pop culture. Luffy's critical reception has been largely positive and has been recognized as one of the greatest manga/anime characters of all time.