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He fights multiple antagonists, and aids and befriends the inhabitants of several islands on his journey. Usually cheerful, he becomes serious and even aggressive when he fights. Luffy uses his rubber body to concentrate his power, executing a range of attacks. In his signature attack, the Gum-Gum Pistol, he slingshots punches at opponents from a distance. Luffy also grows stronger over the course of the story by transforming his body through different "Gears;" this is reflected in his bounty, which is used to measure the threat he poses to the World Government. He is the grandson of Monkey D. Garp, who is a vice-admiral of the Navy; the son of Monkey D. Dragon, who is the leader of the Revolutionary Army;[10] and sworn brother of Portgas D. Ace and Sabo.[11]
