Fujitora was sent by Fleet Admiral Sakazuki to take down Luffy and Law.
His first real appearance was in a restaurant in Acacia, where he was gambling with some of Doflamingo's thugs—who were obviously cheating him. Luffy called them out and helped even the odds. After thanking Luffy, Fujitora drew a sword from his cane and sent the cheaters crashing through the floor into a massive hole. What struck everyone most was his casual comment afterward: being blind meant he never had to see the world's ugliness, which he figured was a decent trade-off. The crew immediately pegged him as a Devil Fruit user, and Luffy just straight-up asked who he was. Fujitora laughed it off—said it'd be better for both of them if he didn't answer—then handed the bartender a piece of paper with an address to send all the damage claims to before walking out.
Later, he showed up at the Corrida Colosseum as a spectator, though he was really scouting the tournament's heavy hitters. He told his men to pull back and requested three battleships plus a bunch of medical staff, planning to hit Green Bit first. When he started asking his subordinates about attendance numbers, the town's population, and the country's size, they were confused until he explained: you count the people you need to protect before you count the enemies.
His Devil Fruit ability lets him manipulate invisible force wherever he wants. He used it to pin those cheaters to the ground so hard it caved in beneath them, and later he'd pull off massive stuff like dropping meteors from the sky. He can reverse the effect too, creating a repelling barrier around himself. He mentioned casually that what he'd done in the restaurant was basically just him testing his own strength.
Content compiled by AnimeList.moe from publicly available sources.
