If you want something dark and scary, I’d recommend Off Season, Offspring, and The Woman by Jack Ketchum. It’s a trilogy about cannibals who live in the Maine woods. Off Season and The Woman are both great; Offspring isn’t as good, but it’s helpful to read it before The Woman.
If you want something light and funny with horror elements, I like Christopher Moore a lot. A Dirty Job is my favorite, but for more Halloweeny type stuff, you could go with his vampire trilogy, Bloodsucking Fiends, You Suck, and Bite Me (all subtitled A Love Story).