Calling all Supervillains...

Ok guys, you all know I've created a superhero, Rain, but I'm having difficulty creating a supervillain. I would like some ideas and I think it would be great coming from my friends. Please, I would like it to be serious, but if you can't help yourself, make it funny. I would like some thought put into it. This Rain project is really important to me and I would like nothing more than my friends to help me out.

Couple of thoughts...
I would really like the villain to be grounded in "real life": this means, he or she should have some reason to do what they are doing and their power (can be supernatural or sci-fi) must be able to antagonize Rain in some way shape or form.

Thanks guys.