I like Vector, The Once-Ler, O Hare, Scarlet Overkill, Snowball, Balthazar Bratt, The Grinch, Jimmy Crystal, The Vicious 6, and Bowser. But, if I had to say which villain is my favorite, I would have to go with Bowser, because he is my favorite villain in Video games, and he is in my favorite movie, The Super Mario Bros. Movie.