Odd Jack has some nice thoughts on making Mary Marvel evil, but besides being snarky about it, as I was on the Turner JLA cover, he starts to go into the odd thinking that happens when "Good Girls" turn to the Darkseid... er... Side.
Its amazing to see how often the new "Bad Girl" decides to use sex as her weapon of choice, or at the writer will use sex to show how uninhibited the new "Bad Girl" is, as if women with repressed sexuality are still a horrible norm in our society. Perhaps they are, but then why don't we see men expressing the same bad tendencies? Because men are already allowed to screw all the women that they want anyway and called "studs" while women who follow the same path are "sluts"?
If we try to go and rip away the odd victorian morality that we still see in some comics, it becomes obvious how "blah" the usual "Bad Girl" is. She puts on a darker costume (Dark Phoenix), uses her powers more creatively (Sue Storm), starts to use her vagina a little more, throw in a little lesbian kink and, PRESTO! You've got the "Bad Girl".
Perhaps if we didn't have such a stultified view of sexuality we would have far darker "Bad Girls". (Oddly enough, since so many of the comic founders were Jewish, their heroes and heroines were terribly whitebread. There is none of the deep sexual guilt in Judaism that we see associated with many other religions.) When I hear about mothers who lock their kids in the car and push the car in a lake, that is a far darker version of a "mother" than most comics will ever tolerate.
In order to make our characters "dark" we have to first identify with who they really are, not just men and women, but how they interact, what their fears are, and then we start to turn the screws on them and the reader. Repressed sexuality may be a part of the character, and, perhaps for Sue Storm, it makes sense, but I'm far more worried about a writer twisting our usual preceptions of women in interesting ways. Morrison's Zatanna from 7 Soldiers was a far more interesting version of her than we've been allowed to see. but Morrison's a great writer.
At least Dark Phoenix didn't have to die for having premarital sex with Scott. She just shouldn't have killed the damn Broccoli people. Perhaps Lis over at Kid Sis will haul out her thoughts on evil Scarlet Witch. Vacation on Wundargore Mountain anyone?