Q of course. The semi-baddie on Star Trek Next Generation. Q is an omnipotent being always throwing the Enterprise into the one trouble after the next. He was so popular they kept him as a part of the franchise in both Deep Space Nine and Voyager.
The Q is actually a continuum which includes lots of folks, who all use the name Q. They have separate personalities but one identity. The Star Trek crews deals mostly with one spoiled Q, bored with immortality and lack of challenge, with no empathy but with the powers of a god. He is fascinated with humans, arguably has a soft spot for them, and enjoys baiting them.
Is he truly a villain? Unclear. He does bad things with no remorse. He exacts a price, when perhaps he should not. But he is not human. Should we judge him by the same criteria?
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