Angels: Legion
Mermen: Cabin in the Woods, plus a bunch more creature archetypes
Cthulhu: Call of Cthulhu, Dagon, and older ones (heh, Cthulhu is in Firefox dictionary).
nanobot plague!: Prey (novel) by Crichton. I’ll guess a movie some day.
Mummies aren’t really done, except for the series from awhle back, which wasn’t horror. But beware, this could go wrong!
Ghosts are my favorite monster, since they can be the most subtle and the most versatile. I also agree that I’d love to see a serious Mummy movie, but I think Brendan Frasier pretty much buried (or entombed) any hope of that for a while.
Really, though, I think we need some new fantasy/horror tropes. And they don’t have to be original; there’s tons and tons of stuff from folklore around the world that’s never been done. How about real Scandinavian trolls that look like ordinary people with tails (or hollow backsides) for example. Or African myths. (Neil Gaiman showed that that could be done successfully in Anansi Boys!) Frankly, as much as anime has gone mainstream, I really thought we’d have a live-action western-produced retelling of Japanese folklore by now. (Or Chinese given the success of Crouching Tiger, Hidden Dragon. Why was that never [del]ripped off[/del] followed up?)
You mean, Twilight?
There’s a serious Godzilla (Gojira is what the Japanese were yelling) big budget flick in the works.
The rumor mill says that Anansi boys was optioned for a film, but didn’t go through. A big part of it was when the producers said: “you know the black characters? Many of whom are descended from an African god, thus less likely to not be of African descent? Can we make them white? Audiences will love it!”
The most ridiculous monster I can think of: Japanese umbrella demons!
No, the bad guy vampires were pretty much bad-guy vampires. That they sparkled is just special effects.
However, I am reminded of an image I saw on Facebook, of Professor Snape delivering a lecture:
If you are forced to turn into a ravaging beast at the full moon and cannot tell friend from foe, you are a werewolf.
If you have the ability to turn into an animal at will and retain your full faculties, you are an animagus.
10 points from Griffyndor.
I always thought the Radish God from Spirited Away needed his own movie. Now I know who he should team up with!