Ever since Rachel mentioned that during the climactic scene in The Avengers, Scarlett Johannsen is holding an itty bitty gun while all the other Avengers (men) are holding weapons, shields, or are actually gods. This was a little sad for little girls looking for a role model of a superhero. While Black Widow/Natasha Romanoff does a good job throughout the movie, particularly her opening interrogation scene, I think she could have been better backed up by some more kick ass women. One of the things about The Avengers is that only Thor actually has real super powers. Captain America is supernaturally strong, but he's not magic. Tony Stark is really smart and crafty, but not endowed with anything beyond that power source in his chest and obviously the suit. Hawkeye's powers are fairly obvious, and the Hulk is mostly smart until he becomes a nearly uncontrollable monster. So here is my group of female Avengers Black Widow could have called upon to save womankind. I have collected them from throughout comics, films, and entertainment. Feel free to suggest others or argue my choices.
Honorable mentions: Minerva McGonagall - she should be on this list, but at her age, she's a bit fragile to really kick ass. Catwoman - she's seriously badass, but the crazy kept her from becoming a serious contender.
Let me know who else I've missed.