Monkey D. Garp
Vice Admiral Monkey D. Garp is the father of Monkey D. Dragon, the grandfather of Monkey D. Luffy, and the adoptive grandfather of Portgas D. Ace. He is also the commanding officer of the 153rd Branch of the Marines, and the man in charge of both Coby and Helmeppo. He was one of the major figures along with Sengoku and Whitebeard while The Pirate King Gol D. Roger was still alive.
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