The latest video in Anita Sarkeesian's Tropes vs Women video series explores Ms. Male characters. Called the "Smurfette Principle" by Sarkeesian, it is when developers create female counterparts with little or no difference based on strong male characters. The best example of this practice would be Ms. Pac Man, who – besides wearing a bow on her head – showed very little difference from her manly counterpart.
Here's more from the video description on YouTube:
"We've defined the Ms. Male Character Trope as: The female version of an already established or default male character. Ms. Male Characters are defined primarily by their relationship to their male counterparts via visual properties, narrative connection or occasionally through promotional materials."
You can check out a transcript of the video here and you can check out the video to your left. Thanks to EZK for the tip.