Pinhead is main villain and leader of the Cenobites from the Hellraiser film series, based on the book The Hellbound Heart by Clive Barker. While there are Pinhead masks for sale, I believe none of them do true justice to the character and that he is best shown through make-up. Listed here are the basic requirements, but for little details and how to actually create Pinhead’s face I highly recommend watching this excellent Pinhead make-up tutorial
Dr. Decker is the slasher villain of the cult classic fantasy/horror film Nightbreed (played by legendary horror director David Cronenberg) and the novel Cabal by Clive Barker of Hellraiser and Candyman fame. He is a serial killer psychologist who convinces his patients that they are serial killers before reporting them to the police and having them killed.