Elijah Wood's name didn't jump to mind but I have to agree. He has an uncanny presence, in the most literal sense. He always feels familiar while seeming out of place. Have to give a nod to Newb on the Peter Lorre comparison. That's a perfect parallel.

More horror actors/actresses to fill the shoes:

Warwick Davis

Johnny Depp

Tony Todd

Sigourney Weaver

One of my personal favourites : Michael Ironside.

Elijah Wood was pretty damn creepy in Sin City.

But is there a purpose mentioning really good actors who hasn't been in any horror movies? (Not talking about Elijah here)

Well, let's be real here, no actor wants to be typecast as a "Horror actor" -- only thing worse is a "child actor". Go ahead and ask them (or read interviews). They graciously say they are pleased to do the work they do, including Horror -- whatever allows them to act for a living, they will embrace -- good guy, bad guy, a mix... they love acting and making a living at it. Traditionally, Horror films don't get big money nor professional accolades in the biz.

Anthony Hopkins is no different. I consider him a Horror actor, but not in exclusion to other types of acting. His biggest films include:

Magic
Silence of the Lambs (his only Best Actor Oscar)
Hannibal
Red Dragon
Bram Stoker's Dracula
Fracture

Hopkins is now known as a great "evil actor".

Just saying, simply because they've had other roles is no reason to exclude them as a Horror actor.

See above ::wink::

I'm not sure if someone said Lin Shaye, but she's definitely one of the great horror actresses. She was in ANOES, Insidious, Dead End, 2001 Maniacs and quite a few others.

Lin Shaye is an excellent pick. Just based on the titles I can think of, she has major horror cred. Killer talent as well.