Kitty Kowalski (Superman Returns)

Portrayed by Parker Posey, Kitty Kowalski was Kevin Spacey’s Lex Luthor's partner-in-crime in Superman Returns, having met the villain in prison.

She fell head over heels in love with Luthor "“ which was mostly thanks to her annoying tendency to enjoy having nice and expensive things bought for her "“ and became his unwitting ally, by being too dumb to even realize that she was an accomplice to a complete lunatic, who was plotting a scheme that would kill millions.

She genuinely isn't consciously a villain at all – and it’s that level of stupidity that makes her so annoying and kind of funny. Mostly annoying though. Definitely mostly annoying. Though she does redeem herself by foiling Luthor when she wises up to his schemes.