I dont think is my fave but i like Grima. My fave is the wingrider with the nazgul, the one no man cant kill, sorry i dont remember the name right now.

I dont know if he could be considered a villan but GOLlUM(Smeagol).i say that because if u read the books he's not all bad,he's actually got a very kind and friendly side.but,in the end he's basically evil