Baddie
Part of speech: noun
Definition: A person of bad character in a work of fiction; in a western he will typically wear a black hat.
Villain
Part of speech: noun
Definition: A vile, wicked person.# An extremely depraved person, or one capable or guilty of great crimes.# A deliberate scoundrel.The bad person in a work of fiction; often the main antagonist of the hero.A [http://en.wikipedia.org/wiki/Serfdom#Villeins villain] was in a low level of medieval serfdom. A [http://en.wikipedia.org/wiki/Cotter_(farmer) Cotter] may have been lower.
Example sentence: I like being a villain. Villains are more exciting.