If you have a villain in your story, then here’s some great advice from one of the BEST VILLAIN ACTORS EVER: Alan Rickman (Snape in Harry Potter) you MUST check out: http://www.youtube.com/watch?v=VpG9YaPF-nM
“As far as I’m concerned, I’m not playing the villain. I’m playing somebody who wants certain things in life — has made certain choices — and goes after them.”
And here, he repeats himself on another movie: http://www.youtube.com/watch?v=VpG9YaPF-nMhttp://www.youtube.com/watch?v=wZ2LMDT6xrU&feature=g-vrec&context=G2bf634aRVAAAAAAAAAQ
“I’m not playing a villain. I’m just playing somebody who has a certain checklist of things that he wants in life and he goes after them. And other people … decide that is appalling and has to be stopped.”
Alan Rickman isn’t in denial there. He’s point out a key piece of advice for creating your villain: NO ONE goes through life thinking “I’m the bad guy.” (Even Mother Gothel…)
From what I can see, there are two types of villains.
1. The Baddie who just loves being bad
This is your basic serial killer type, who kill just for the pure pleasure of it. They have no qualms about what they are doing, and most of their thinking doesn’t quite match up with society. He’s got Sociopathic tendencies. Think Heath Ledger’s version of the Joker. This is the person who does things just because he can.
2. The Baddie who doesn’t realize he’s a baddie
This type of villain can range across the spectrum. It’s the person who wants to know the answer and will do whatever it takes to get that answer, including torturing or killing innocent people. It’s the person who sacrifices morals when the need arises,
When we look at The Mummy and it’s sequel (we’ll ignore the third one since it was just weird), we see two couples deeply in love. On the good side, you have the flashy American hero, Rick, and his girl, Evie. And the baddies are the mummy, Imhotep, and his girl, whats-her-name. Rick is a great hero, but he doesn’t have qualms with killing people. He’s good in a fight, but when it comes down to it, he usually makes the right decisions. He does anything to protect his family, and a complex hero that we love to cheer for! Now Imhotep loves his girl so much, death cannot separate them. He resurrects the girl’s spirit in her reincarnated body so they can be together. But in the end, she gives into selfishness, and instead of saving Imhotep, she runs away to save herself. But if you go back to the beginning of their story, their whole relationship was based on mutual goals, and a mutual selfishness. In the first movie, Imhotep selfishly wants his girl back, and he is willing to sacrifice another girl to get that. As tempting as that is, could you see Rick doing that same thing to get Evie back?
Every character you write faces one choice after another. Will they follow the values that society has given us–trustworthy, loyal, helpful, friendly, courteous, kind, obedient, cheerful, thrifty, clean, and reverent (thank you Boy Scouts for providing me a great list!)–or will they follow their own selfish desires? Will they help a fallen comrade even if it means they would die as well, or will they leave a man behind to save their own skin? The more you switch up these characteristics in your protagonist and villain, the more complex your characters will be. A good example of this is Firefly, where the characters are essentially murderers and thieves, but wait . . . they are the good guys. They are loyal to each other, and fight for what they feel–and what the audience would agree–is right.
Here are some further tips to consider when creating your villain:
 Match your villain to your story. Now when you are creating the villain for your novel, it’s important that your villain match your story. You can’t have a Hannibal Lecter in a YA Romance. It just doesn’t fit. So when considering your story, think on the scale where your villain falls. From schoolyard bully to serial killer, there is a wide range to pick from.
 Make the villain as 3-dimensional as your protagonist. Give the villain backstory, which might include a traumatic event that led the him being a villain. That could be their motivation for making the choices they do. You don’t have to add that to your story, but it will help flesh out the character in your mind, which will come across on the page.
 Add the good to the bad. Remember to flesh out your character, and a good villain isn’t purely evil. They have good attributes mixed in there as well. You know that old saying to “show the villain kick the dog?” Well maybe have the villain love dogs, so he treats them better than he does humans.
 What does the villain want? Usually this goal collides with what the protagonist wants. Or sometimes the goals are the same (an extreme example would be world peace), but the villain will sacrifice horrible things to obtain that goal. Think Nazis where the ends justified the means. This is exactly what Alan Rickman was talking about.
 Sincerity sells the character. You have the make the villain truly believe what they are doing to make your villain believable.
 Remember the comeuppance. The villain has been horrible the whole book, and the reader wants them to get what they deserve. That doesn’t mean kill off your character. In the second Harry Potter book, Malfoy’s comeuppance is when he loses his servant, Dobby, because Harry tricks him into giving Dobby clothes. After treating Dobby so horribly the whole book, we are so excited to see Malfoy go servantless for the rest of the series. And in some books, this never does come around.
Here’s a thought for the day: Sherlock Holmes would’ve made the world’s best villain, but instead he constantly chose to solve crimes instead of instigate them.