Writer's Block: Love to hate

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Back in their respective heydays, I was a big fan of Scorpius (Farscape) and Luther Mahoney (Homicide: Life on the Streets). In both cases you had a villain who was amoral and determined to bring down our heroes; but then they'd turn around and help, or do something good for someone else. They did the right thing just enough to make you wonder what they'd do next. More recently, I think Ben Linus (Lost) falls into this category.

For pure sociopathic delight, Alice (Luther) is tops these days.