Voldemort - Congratulations, you're as evil as one can be. Not afraid to harm either wizard or Muggle, you never even had a conscience. What will you accomplish when Harry is out of the picture?
Dementor - Your purpose in life is to make misery, and unlike human wizards you can't change that. Hated by the world, even the worst wizards, you exist only to create sadness. Wow, that sucks
Death Eater - Loyalty to Voldemort is your highest priority. You've made the choice to commit acts of evil, but that doesn't bother you at all.
Snape - Although the Dark Mark still burns on your arm, you've given up that life for good. Or have you? Right now you can go either way.
Draco Malfoy - Yes, you seem to be a bad guy, but beyond leveling weak curses at Harry you're not up for much just yet. Stop playing around and get serious about your evil!
Sirius Black - Your past is violent and people have heard a lot of negative things about you. However, you were faithful to your friends. If you don't clear your name, you'll go down in history as a wicked one.
Remus Lupin - You seem like a nice enough guy, at least until the moon is full, but it's hard for you to control your darker aspects.
Ron Weasley - Rules are meant to be broken, as long as you don't get caught. However, you are a nice enough fellow and you tend to do the right thing. Best of luck!
Hermione - Your intelligence makes you less tempted to do the wrong thing, and everyone knows you're a teachers pet. Keep your nose in your book and yourself out of trouble, and you'll do okay.
Winky - There isn't a mean bone in your body!
Dumbledore - Benevolent and wise, evil is not a part of you. You rarely even make the wrong choices, but get rid of those Cockroach Clusters!!