Dr. Hannibal Lecter is a character in a series of suspense novels by Thomas Harris. A respected Baltimore socialite and renowned forensic psychiatrist, who moonlights as a cunning, highly intelligent, cannibalistic and psychopathic serial killer, Lecter, also known as the Chesapeake Ripper, is a central character in the novels featuring him. The authorities incarcerate him, and he is occasionally consulted by the FBI to assist them in finding other similar serial killers within the United States. (Wikipedia)
I know since it won a bunch of Oscars people like to call it a thriller but one character eats people, and another skins them alive and wears their skin as an outfit. I am going to go with a horror film for this one.