How do you create good villains?

Well what kind of villain do you want? Are looking to make him dark and dangerous, something like the joker from the dark knight? or are you trying to make him fun and enjoyable because he always screws up, something like dr. evil? Usually when your creating a villain go with the theme of your story. Is it a darker story? If its something like elektra for example then you might want to make the villain dark and spontaneous and give him a really good power (eg: his tattoo's come out of his skin). But don't make him so dark that he's boring. I see so many shows that make the character just a normal bad *** that wants to control everything, like the sith lord from star wars. Have a background, give him a personality, or even just make him over the top. Just Create a flow that makes him unique that you want to see him again. It's like the joker from the dark knight. See how he was dark and devastating but he had an upbringing to him that made him fun to watch. Don't just think just because your villian can do all these amazing fight tricks and squirt out a few bad *** lines that he is an awesome villain. Create a background image with him. Its the same if your going with comedy villains. Don't stereotype his character so that he is always trying to be bad *** but he keeps screwing up rather in actions for in lines. Create an image around him. Just create a story behind your villains and then become creative and think of magical powers later that defines your character. Usually most villains have a power that has something to do with their personallity. You can do that as well. If your villain is fast and frisky then maybe she has the power to turn into a cat. I don't know. Use whatever creativity you can, just NEVER stereotype your villains!