Vader doesn't belong in the poll, but his boss does. The Emperor manipulated everyone, started multiple wars, destroyed planets, and brought down the Republic that last thousands of years, all for his own personal glory and power. For that matter, even blowing up Alderaan was Tarkin's idea, not Vader's. At most, Vader's the 3rd most evil character in the SW movies.
That's MISTER Godless Vegetarian Tree Hugging Hippie Liberal to you.