Once a member of the dreaded Rocks Pirates before raising a crew of his own, Captain John grew famous for the colossal hoard he buried, a fortune that vanished when his men turned on him. Long after his death, Hogback rebuilt his corpse into a General Zombie for Gecko Moria, and treasure hunters like Buggy still chase his lost riches.
Lean and of middling height, John kept long lavender hair above a fair complexion, blue eyes, and a light scattering of stubble across his chin. For the God Valley Incident he turned out in a pink shirt under a dark coat whose trim, buttons, and epaulettes were all yellow, its green sleeves pushed up to the elbows. Drink stayed close at hand in both his living years and his undead ones.
His zombie self had gray-brown flesh and wore a bandaged white shirt beneath a red coat, its epaulettes yellow and its sleeve ends tipped in pink. Vertical white-and-black stripes ran down his trousers, two blades protruded from his stomach where death had found him, and his gut was riddled with open stab wounds.
John's avarice in life ran so deep, and his nature so vile, that his own crew rose in mutiny and killed him. He drank to excess, and like every other man aboard with the Rocks Pirates he was smitten with Shakky the instant he laid eyes on her, declaring that her favor belonged to whoever piled up the most loot. He acted on that belief by using his magnetism to drag all of God Valley's treasure toward himself. Returned as a zombie, he stayed sluggish and soaked in liquor, the alcohol he swallowed dribbling back out through his perforated belly.
In his living years John ran with the mighty Rocks Pirates before leaving to make his own name, though as a leader he failed badly enough for his crew to mutiny and end him. His power came from the Jiki Jiki no Mi, a Paramecia fruit that let him bend magnetic fields to draw metal toward him or hurl it away; with it he fashioned a metal gauntlet and tried to sweep up the riches of God Valley. He was physically remarkable too, lifting a treasure sack several times his own size in a single hand without strain, and he bounced back quickly from an explosive blow dealt by Ganzui. A blue-hilted sword and a green-hilted one hung at his belt alive and dead alike. As a General Zombie he was all but unkillable, with salt his lone vulnerability.

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Captain John was killed in a mutiny after his own crew turned on him over his growing greed, and years later Hogback reanimated his corpse as a General Zombie serving Gecko Moria at Thriller Bark.
Captain John ate the Jiki Jiki no Mi, a Paramecia type Devil Fruit that let him control magnetic fields to pull metal objects toward himself or throw them away, which he used to try to sweep up the treasure of God Valley.
Captain John buried an enormous fortune before his crew mutinied and killed him, and that lost hoard vanished with his death, making it a target that treasure hunters like Buggy still chase.
Yes, Captain John sailed with the Rocks Pirates before leaving to lead his own crew, though he ultimately failed as a captain badly enough that his men mutinied against him.
After his death, Captain John's corpse was rebuilt by Hogback into a nearly unkillable General Zombie for Gecko Moria, with salt as its only known weakness.
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