Disney has chosen to keep their animated content light and family friendly, which is why some legendary female characters will never make it onto the big screen under the Disney monicker.
Characters like Mai Bhago, the Sikh warrior-saint who led forty fierce women against the Mughal army and lived to tell about it, and Pasiphae, the immortal daughter of Helios who was cursed with desires to couple with a bull and gave birth to the Minotaur, are the stars of tales way too explicit for a general audience:
Illustrator, history/mythology buff and former DreamWorks animator Jason Porath is giving these hardcore heroines their day in the sun through his site Rejected Princesses, which is full of fun Disney inspired illustrations and a fairly comprehensive backstory on each character, so you can see what you're missing when Disney chooses some G rated gal over these fiercely capable femmes!
-Via io9