Ooh! I like this.
My best favorites are; werewolves, vampires, and the undead/zombies.
Werewolves for the fact I've...always loved wolves and then this strange idea of people turning into monstrous wolves sounded pretty cool as a little kid but that's where it originated from. Plus werewolf Van Helsing was pretty cool in the movie.
Vampires because of Dracula. I love Dracula from the reason above - Van Helsing. Whoops.
And lastly, undead/zombies because who doesn't love your classic zombie?
Clearly, mine are rather simple (basically the most popular ones associated with the spooks) but that's fine, it's perfect to me.