Robin Hood loved that fox in the movie when I was a kid. It was the first Disney movie I ever saw on the big screen. OOps my bad I read the question wrong the first time I looked at it. I would have to say my favourite non disney villan would be Marvin the Martian
I don't know if they really count as villians, but... the rotten kids in Willy Wonka! Augustus Gloop, Violet Beauregard, Mike TeeVee, and of course Veruca Salt. But not Charlie Bucket- he was nice.