April is Pirate-Themed Supervillain Month
Cap'n Fear first appeared in 1995's Detective Comics #687. No one knows who he really was or why he decided to become a techno-pirate and spend every day speaking like it was Talk Like a Pirate Day. But he did, and it actually seemed to be working out pretty well for him, plundering yacht parties and fancy cruises. At least until he hit one that had Bruce Wayne as a guest. Then Batman and Robin were on his tail, and while he was surprisingly able to capture Batman, Robin managed to capture his "digital parrot" (every techno-pirate supervillain needs one), and hacking into it's memory banks was able to discover his hideout. Cap'n Fear then lead Robin to the buoy where he'd stranded Batman to die, but with the aid of some sharks, Batman had managed to escape his bondage. A fight ensued and Cap'n Fear fell overboard and was swept away by the tide and presumed dead. Which of course means that he reappeared a few years later to help with a prison break from Blackgate Penitentiary, where he screwed over the convicts and stole their money. Then he was never seen or heard from again.