Garp is known as one of the strongest Marines of all time, with legendary physical strength. He possesses the ability to use Haki and is one of the few people who could stand up to the Pirate King, Gol D. Roger.

Garp cares deeply for his family, especially Luffy and Ace, even though they chose the path of piracy. He also has a strong sense of justice and will not hesitate to defy his superiors if he disagrees with their decisions.