My favorite villain is Zeref. I'm so interested in all the things he has done to get to where he is now in the story and I wish Mashima would give us more! I find him very intense, I mean seriously he's the strongest wizard in the world of fairy tail, who is immortal and created all these crazy demons to try to kill him. I find him very intellectual and straight forward. It'll be very cool to see what happens after the latest chapter of the manga.