I think a "positive female character" is just a good character. Lieutenant Mira, Naomi Hunter, Chie Satonaka, Zoey,Femshep. In my mind, there is no differentiation between female characters and male unless it's shoved down my throat like HEY GUYS SHE IS A LADY CHECK OUT THIS SEXY DIALOGUE
Perhaps it's just a product of growing up on movies like Terminator and Alien, but every time I see an over sexualized female character or a helpless "please protect me because i not have testicles" woman I feel a little disgusted. There's so much potential lost when you write with a female in mind instead of a female character.