I’m noticing a distinct lack of Terrifier and Terrifier 2 in these comments. Art the Clown is perhaps the best antagonist I’ve ever seen in the horror genre and true originality is rare in the modern horror filmscape.
The Ring is also good for originality as far as modern classics, though it’s a whole book series in Japan.
Edit: I also liked The Shrine, forgot to mention that one. Again, originality.