Mine is the orang-bati. Reddish Bat people that take children during the night back to thier volcanic lair to devour them, how much cooler can you get then them?
Siren. Right now I'm about 150 pages into a novel I'm writing about a dead siren that's found by police in a manmade lake.
Tengu's are great (they scare me to hell) i mean those noses are the only problems,but they are cool as hell
Alien Robots that changes into cars and such. A few was rumored to be witness in Mission City. Someone caught fuzzy video in China...