Cornelius Stirk is a DC comic book villain and an enemy of Batman.
Stirk is a supervillain who, like Scarecrow, uses fear to get to his victims. Stirk has the ability to make other people see him as someone else, allowing him to get close to his victims. He operates under the delusion that he requires the nutrients and hormones from peoples' hearts in order to stay alive, and these are best prepared with norepinephrine by inducing fear in the victim prior to death.
In his first appearance, Stirk is released from Arkham Asylum after being certified as sane. He had been confined since the age of 16 for trying to kill a classmate. After his release, Stirk subsequently stops taking his medication and begins his escalation into a serial killer. Despite his many murders, Stirk professes to dislike violence. He also dislikes light and therefore operates almost exclusively at night. Oddly, he refers to almost everyone as "sir".
The Last Arkham Stirk makes a brief cameo in the beginning of the four-part storyline The Last Arkham, where Jeremiah Arkham, Arkham Asylum's new director, utilizes more barbaric methods to "cure" him. When Stirk refuses to take his medication, for instance, Jeremiah has two orderlies brutally beat him with billy clubs and forces the medication down his throat.
Stirk appears in the second to last episode of the season 2 of Gotham titled "Wrath of the Villains: A Legion of Horribles". After Edward Nygma attempts to escape Arkham Asylum and fails, he is placed into a cell with the cannibalistic Stirk as punishment, with only a chain binding Stirk keeping him from attacking Nygma and devouring him. Ethel Peabody checks on them, and Nygma makes a deal with her to go and get Hugo Strange as James Gordon is on his way and he is aware of the monsters that Strange is making in the basement of the asylum. Nygma is later released from the cell, and used to extort information from Bruce Wayne and Lucius Fox on their knowledge of Wayne Enterprises' activities.