One Piece has been entertaining fans for more than two decades, and the story will be getting more intense now that the final saga is underway. The Straw Hat Pirates are the main focus of One Piece, and Roronoa Zoro is the crew's first mate. He is a master swordsman who can use all three types of Haki, as well as advanced forms of Armament and Conqueror's Haki. He has defeated several strong Devil Fruit users over the years, but there are Devil Fruits that can actually counter him.