This week's question: What's your all-time favorite book villain?
Hmm...that one's a toughie. I'm going to cheat and pick two:
Valentine from The Mortal Instruments series by Cassandra Clare. He's just this twisted genius that's the proverbial monkey wrench in everyone else's lives. As far as character development in concern to villains goes, I think his is one of the best.
Circe from the Gemma Doyle trilogy by Libba Bray. First of all, Circe's alter ego (which I won't reveal in case you haven't read the books yet) completely fooled me. I never guessed that she was a villain. But I thought the most intriguing thing about Circe was that she served as a kind of a foreboding warning of what Gemma and her friends could become if they gave themselves over completely to the magic.