"The Starfish Freak" - Batman: Arkham Knight

Known as "The Starfish Freak," he was once a construction worker at Seagate Amusement Park who became possessed by one of Starro the Conqueror’s Star-Spawn. After turning violent and attacking his fellow workers, he was eventually subdued, and both he and Starro were imprisoned.

At Jack White’s suggestion, Edward Burke planned to feature them as the main attractions of the park’s freak show, emphasising the man’s loss of bodily autonomy and marketing him as “more beast than man.”

After Jack White and Dr. Harleen Quinzel persuaded Burke to take his own life, shortly after he signed over the deed to Seagate, some believe that the Starfish Freak was stored away alongside Starro. 

However, most assume he was killed when the Joker halted all construction plans and turned the park into his latest hideout.