Isn't Artemis Fowl (#10) more of an antihero?
And I would probably go with Gollum. Not only was he good-turned-evil, he was also turned-good-again-turned-evil-agained. It's interesting seeing how he changes from almost-hero to baddy. He's a lot more human than distant Sauron. Saruman would come second, because again, it is quite frightening seeing how he turned to evil and how anybody could, perhaps, fall to such levels, thinking it to be for the greater good.
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