7. Madame Hydra/Viper
Enter: a nameless orphan who rose through the ranks of HYDRA to attain the status of Madame Hydra. Later, she earns her own name Viper. I've seen career-hungry opportunists before, but this super bad-girl redefines the whole concept. Assassination, political manipulation, extortion, and all other sorts of attempts at terrorism and world domination are all parts of Viper's daily life. Like her namesake, she's green, mean and extremely venomous. Beautiful, but deadly, she faced off against the fledgling New Mutants (New Mutants #6, August, 1983) resulting in the presumed death of one of the New Mutants, Karma. With absolutely no mercy, Viper ruthlessly unleashed her enthralled paramour, Kenuchio Harada, aka the Silver Samurai into showing these young teenagers the full extent of her vehemence. Viper also knows how to entrap men into doing her bidding. Not counting the Silver Samurai, Viper has managed to attract the attentions of The Red Skull, Nick Fury, and The Punisher and even managed to trick Wolverine into marrying her. Strictly out of convenience, of course, but still, that's no mean feat. So the valentine you can expect to get from this evil she-snake? Well, in a twisted way, it'll be whatever she wants YOU to give her, because her happiness is your gift from her.