Fen Bock

Bock keeps his wild black hair pulled into a ponytail, and a pair of straight brown horns rise from his head. His own crippled human legs were swapped out for grayish-white sheep legs. For clothes he favors a dark blue jacket over a lime green shirt patterned with black designs, and a mahogany gourd is slung across his back.

Bock's devotion to Caesar Clown ran deep enough that he addressed the scientist as Master. That loyalty curdled into a sense of betrayal once Caesar turned on his own subordinates, prompting Bock to escape the facility with the Straw Hats and the G-5 Marines. He was also openly frightened of Smiley, having no idea what the creature was.

Bock swings a gourd-shaped mace fitted with two spiked balls, and he wielded it well enough to overpower a number of G-5 Marines. Four years before the story, he was a Punk Hazard prisoner when Vegapunk's chemical weapon incident struck. The poison gas cost him the use of his legs, but when Caesar arrived a year later he handed out artificial legs, and the grateful ex-prisoners accepted him as their master, unaware he had caused their paralysis. Later, Trafalgar Law fitted them with animal legs. Bock first turned up battling the G-5 Marines outside the lab beside the other ex-prisoners, was rattled when an exploding ship and Smiley's slime landed near his group, and retreated inside at Caesar's order, warning his comrades when the shutters opened to let the Marines through. When Luffy began cornering Caesar, the scientist released the lethal H2S gas and revealed how easily he could replace his underlings; Bock and the others, clinging to the belief that Caesar's cruelty was an act, watched in horror as he killed the subordinates caught on the battlefield. After Caesar's defeat, Bock survived and was seen fleeing the laboratory together with the Straw Hats and the G-5 Marines.