That rings a bell for some reason.........
Well, I'm not quite sure abvout a villain, but I can give you a few tips, not saying you'll need them, about the film.
If its meant to be a horror film you have to have the right atmosphere, and most importantly the lighting.
As for the villain, use your own fears, and use that, like make a combination of things that scare people. Clowns, spiders, e.t.c. It could be a villain which takes many shapes, or at least it appears that way.