One of my favorite characters is a villain, Aizen. I usually prefer villains over good guys because of they usually have more interesting attributes.
I do like Aizen because:
- He seems to be so powerful no one can actually challenge him
- I like that he isn't cocky about his superior powers
- I like that he's very polite
- I like that he's a calm person and with so much mysteries
- He like to plan just about every move of his making him impossible to defeat
- He likes to talks, no matter what situation, small talk. He uses rare words making his dialogues epic
- In reality he's depressed because he's too powerful for anyone and no one can challenge him
More of him:
http://bleach.wikia.com/wiki/S%C5%8Dsuke_Aizen