There's not a lot of explaining that can be done here; the title pretty much speaks for itself.
This is a list of MMA fighters and the horror movie villains I think they could portray, based either on their appearance or their character traits.
That's really all that needs to be said. Let's get started...
Leprechaun is the villain of the aptly-titled film Leprechaun.
The notion of casting Spencer Fisher as this figure of Irish lore is based purely on appearances.
They both have relatively scraggly facial hair and while Fisher doesn't have as lumpy a face as the Leprechaun, he does have quite a lot of scar tissue, which helps the look.
Spencer is also somewhat small, fighting in the UFC's lightweight division. With the right camera work, it probably wouldn't be too hard to make him seem Leprechaun-sized.
Pyramid Head is a villain from the movie/video gaming franchise Silent Hill.
There's not a whole lot of acting involved in playing Pyramid Head, considering that his face is covered by a big metal pyramid.
To pull off the role, you basically just need to be a big muscular person.
I'd say big, muscular person is a pretty fitting description of Alistair Overeem.
Francis Dolarhyde is the villain from the film Manhunter and its better known remake, Red Dragon.
The Red Dragon version of Francis bears a striking resemblance to ex-UFC heavyweight fighter Antoni Hardonk.
They're large men with similar hair cuts and I believe Hardonk's accent complements Dolarhyde's slight speech impediment.
Obviously, Antoni is missing the hair-lip, but I'm sure the make up department could take care of that easily enough.
Patrick Bateman is the villain from the cult classic American Psycho.
There is a reason that Stephan Bonnar's nickname is "The American Psycho."
Clearly, Bonnar is not actually a psychopath, but he does have noticeably glassy eyes that sometimes make him look a touch insane.
The Tall Man is the villain from the movie Phantasm.
The Tall Man is very tall.
Stefan Struve is very tall.
Does it need to be any more complicated than that?
The Jackal is one of the 13 ghosts from the movie 13 Ghosts.
Apart from Clay Guida and the Jackal being similarly wild-looking, they are both ferocious (in different ways) and both set a maniacal pace when partaking in their respective arts.
Mr. Hyde is, of course, the alter ego of Dr. Jekyll in the famed story of Dr. Jekyll and Mr. Hyde.
Hyde is basically Jekyll's id operating in full force without the influence of his ego or superego, for those of you familiar with Freudian theory.
For those of you unfamiliar with Freudian theory, Hyde basically acts completely on impulse without any care for potential repercussions. He is only concerned with satisfying his own needs.
Anyone who saw Brock Lesnar post-fight at UFC 100 knows that his id can sometimes take control, to an extent, and so I think Mr. Hyde is a fitting part for him.
John Kramer AKA Jigsaw is the villain from the Saw movie franchise.
This comparison is far more conceptual than appearance-based.
John Kramer is a master tactician and a brilliant engineer, but due to an ongoing battle with cancer, he is physically weak and unable to inflict much harm with his own two hands.
Randy Couture is far from weak, but he has reached the point in his career where his ability to hash out a masterful game plan far exceeds his ability to actually execute said game plan.
Couture can figure out how to win a fight, but his body isn't capable of doing what it needs to do to make that win happen.
Werewolves are a common theme in horror films. I don't really need reference a specific movie; the werewolves look relatively the same in all of them.
Andrei Arlovski is a hairy man (don't let his chest fool you in this picture, he has clearly shaved it) and he wears a mouth guard that's made to look like fangs.
There's a reason you never see Arlovski drinking Coors Light ("The Silver Bullet").
Pinhead is the villain from the Hellraiser movie franchise.
He is a demon of sorts, with an eerie intelligence, and an infatuation with pain.
Forrest Griffin is also very intelligent, although not in an eerie way, and seems to enjoy pain on some level. In several of his UFC fights, Griffin can be seen smiling after being punched in the face by his opponent.
Forrest also once held a lighter to his skin, until his skin was practically ablaze, just to screw with someone.
Predator is the villain from the sci-fi thriller of the same name.
Did I match Rameau Thierry Sokoudjou with Predator just because Rameau has dreadlocks and Predator has those things that look like dreadlocks?
Dr. Frankenstein's monster might be a little bit slow-moving, but he's also incredibly powerful and if he catches you, you're in big trouble.
That exact description could also be used to describe Shane Carwin's striking.
Hannibal Lecter is the villain in the classic horror films Silence of the Lambs and Hannibal.
Dr. Lecter is a brilliant strategist. At all times he seems to be two steps ahead of his foes and every little move he makes is deliberate.
Georges St-Pierre is much the same way when it comes to fighting. He is a skilled strategist who always seems steps ahead of his competitors when it comes to game planning and also quickness.
Jason Voorhees is the villain of the Friday the 13th movie franchise.
Voorhees is a unique horror villain because, in a lot of ways, he is completely unimpressive. He's sort of bumbling and clumsy, a little bit overweight and generally pretty slow.
When he catches his victims and does his thing, I find myself wondering, "How are people actually allowing themselves to be done in by this oafish figure?"
Mike Russow embodies the same general sentiment when he fights.
In his past two UFC bouts, Russow has looked mediocre at best, seeming slow and like his punches had nothing behind them. However, he won his last two fights, and they were both finishes.
When Russow steps in the cage and fights, you think there's no way he'll win and then he pulls off the victory, much the same way as it seems like Jason shouldn't be able to catch anyone, but always does.
Michael Myers is the antagonist of the Halloween movie franchise.
Myers is known for his expressionless mask and the total lack of emotion with which he carries out his gruesome deeds. He seems eerily calm at all times and never in a hurry. Michael just plods forward endlessly, unwaveringly confident that he'll eventually get whatever he's after.
Fedor Emelianenko is similar to Myers in that he is known for his total lack of emotion and expression. Even when trying to finish his opponent, Fedor seems completely calm.
Some might think the Emelianenko is too small to play Myers, but don't let Rob Zombie's remake fool you; Michael was portrayed by Nick Castle in the original 1978 version of the film, and Castle was just six feet tall.
Freddy Krueger is the villain from A Nightmare on Elm Street and its many subsequent sequels.
Krueger is arguably the most talkative and energetic villain in the history of horror films. Freddy doesn't just kill people; he loves to add insult to injury by mocking them as they die, usually with cheesy one-liners.
Jason Miller has just the right sort of wacky charisma to pull this role off and, if he can get the writers from his TV show Bully Beatdown on board, the cheesy one-liners shouldn't be a problem, either.