Monkey D. Garp is a legendary figure in the 'One Piece' series, holding the rank of Vice Admiral in the Marines. Known for his immense strength and combat prowess, Garp is nicknamed 'Garp the Fist.' He is the grandfather of the protagonist, Monkey D. Luffy, and is notable for his role in capturing the Pirate King, Gol D. Roger. Despite his allegiance to the Marines, Garp is a complex character with a strong sense of justice and family, often finding himself torn between his duties and his personal ties.