Board Thread:Fun and Games/@comment-27010092-20161006232606/@comment-26813439-20161007221745

Purple Man is purple because he's actually an alien that came from outer space to get blood from human children for whatever reason. Being an alien, he had advanced technology and intelligence, he then built Fredbear's with free-roaming suit/animatronic hybrids, knowing children loved animatronics. So this also answers why there are robots that can roam around freely in the 80s and 90s in the FNAF universe.