There aren't a ton of characters in any of the American Horror Story shows that one could classify as being particularly good, so when you come out and call someone out for being eviler than usual, that's really saying something. Fiona Good goes above and beyond the average morally ambiguous and becomes actively malevolent. She's the Supreme of the coven featured in the show, and she is utterly committed to the goal of eternal life, willing to do pretty much anything to achieve it. Upon being convinced that she needs to kill the new Supreme, she makes it pretty clear that she's not too concerned about racking up a body count as she murders everyone unluckily enough to get in her way with extreme prejudice. While Jessica Lange played some other nasty characters during her time on American Horror Story, Fiona is the jewel in her demented little tiara.