Agreed with Lord Shen. He's such a well thought out characters.
I'm going to be very self-centred here and say my character, Sakura Soh.
She's evil, but not out of choice. She was bitten by a Dark Fu (that turns you evil) and because of this, her mate tried to drown her. She goes to find him, but she knows what she's become. She finds him with another female and she kills them both. She doesn't care who she murders and even slaughters cubs.
Darth Vader (Only from the old movies. I can't stand the new Star Wars)
Kiriyama Kuzou - Battle Royale - Far too bad***. He just does not care about anything.
Mitsuko - Battle Royale - Beautiful but deadly. She's just horrible!
Teacher - Battle Royale - Probably not evil, but he's the one who sends the kids to their doom.
Dorian Grey. Technically, he is the bad guy in his own movie.
"The Chavs" - Eden Lake. They're all very well played.