Complete Monster: Cruella DeVille in the live action version, played by Glenn Close, is the only incarnation of her to truly qualify for this.
Fan Dumb: After the release of the live-action version, people rushed to get Dalmatians as pets. Dalmatians are highly energetic and need plenty of room and time for exercise, and are prone to hearing problems. Many of the Dalmatians adopted during this craze ended up surrendered to shelters or dumped.
Villain Decay: Cruella was noticeably less menacing and competent in the second live action movie than she was in the first, though still thoroughly despicable.