Fan Casting Adaptational Villainy in Sort by Tropes

The villain of an adaptation or retelling of a story is a familiar character who wasn't as bad in the source material. Sure, they may have been a bit of a jerk, or couldn't care less about the good guys, but they weren't evil. In any case, the character seriously Took a Level in Jerkass in the P.O.V. Sequel, The Movie, The Film of the Book, or any other reimagining of the original material. Where they were simply a pest before (and never treated as anything worse than that), or even friendly, they now kick dogs for fun.