A while ago I read a post on Nathan Bransford's blog about making sure your main character is redeemable. I thought he did a great job explaining how to keep your MC likeable even when they mess up big time.
I seem to have the opposite problem right now. I think I may be making one of my characters a little too likeable, and I wonder if it's going to make my readers fall in love with the wrong guy. I just can't seem to help but write him the way he comes to me, and he is a very charismatic man! It's getting to the point where I wonder if his flaws are big enough or bad enough to counteract his appeal. I often ask myself, are my readers going to be able to switch their loyalty to the true love interest? I hope so, because I really don't want to water down this character. He's just so good at being bad.
I suppose literature and movies are full of villains we adore. One of my personal favorites is the Phantom, especially as played by Gerard Butler. Have you ever fallen for your antagonist? Who do you love to hate?