My inspiration mostly comes from concepts seen in various sources, such as movies, tv shows/anime, books/manga, and especially Dungeon & Dragons and RPGs classes.
But sometimes, like Marya said above, I can get inspiration from music, such as a Satanic Warlock inspired by "Inside the Fire" from Distubed and Team Predator (a duo of two hunting twins) from "The Animal" by Disturbed again. And yes, Disturbed in my favourite band, wheras I get most of my inspiration when it comes to RP characters. Rock also helps, as it is a type of music I really appreciate.