Monkey D. Luffy (モンキー・D・ルフィ Monkī D. Rufi), nicknamed "Straw Hat", is the 17 year-old captain of the Straw Hat Pirates and primary protagonist of the One Piece series. At the beginning of the series, he accidentally eats a devil fruit, causing his body to gain the properties of highly stretchable rubber.ch.1 These properties are a result of Oda's desire for the fighting style to be silly, so that no matter how tense a situation gets, the reader can relax without becoming stressed out. After his life is saved by Shanks when he is seven years old, Luffy decides to achieve the tantamount goals of finding the series' titular treasure and succeeding Gold Roger as King of the Pirates.ch.1 Ten years later, wearing Shanks' straw hat, he sets out to sea to gather a crew and sail the Grand Line, where the One Piece is supposedly hidden.