3. Bad Guys
Horror films boast the best baddies in the whole of cinema. They could be plain cannibals. They could be just plain cannibal psychopaths like Hannibal Lecter. They could be plain cross dressing, chainsaw wielding, cannibal psychopaths like Leatherface in Texas Chainsaw Massacre. The baddie could be man himself or an animated puppet. A rabid dog or a demonic possessed little girl. There is no limit to the horrid baddies that horror film writers can conjure up. Heck, your very toaster can turn on you. This is a reason why Horror is so great - limitless baddies who can freak the hell out of you depending on what pushes your buttons - spiders, aliens, zombies, ghosts, vampires, inanimate objects coming to life, axe killers and mutants.