Borr is a pirate, a member of the Giant race, and a member of the Triple D Pirates. He's the only member other than the Captain and the first mate to know how to perform all four versions of Haki. They're also the only three who can perform Conqueror's Haki. Alfhild ate the Fune Fune no Mi, a Paramecia-type Devil Fruit which allows him to transform into a pirate ship, which is the very ship that the Triple D Pirates sail on. While his Devil Fruit doesn't aid him in combat, he has enough skill with his physical strength, his battle axe, and Haki to be an incredibly formidable foe. He was once the King of Elbaf, the land of Giants, and is the father of Odin, the current King, Vili, and Ve, and the grandfather of Loki.