User blog comment:SnakeTongue237/Top 10 Horror Movie Killers/@comment-26030957-20150510203750

Right off the top of my head:

Patrick Bateman from  American Psycho (If you haven't read the book please do so now)

The Firefly Family (Captain Spalding, Otis Driftwood, Baby Firefly, Tiny, Mama, and Rufus) from Rob Zombie's House of a Thousand Corpses and Devil's Rejects

Jupiter, Mars and Pluto from The Hills Have Eyes

Krug Stillo, Junior and Sadie from The Last House on The Left

Jack Torrence from The Shining

Kurt Barlow and Richard Stakler from Salem's Lot