There's characters like Supergirl, Batgirl, Batwoman, Spider-Girl, Spider-Woman, Mary Marvel, She-Hulk, Stargirl, Hawkwoman, Silk, Spider-Gwen, Stature, Zatanna, Aquagirl, Miss Martian, Power Girl, etc., but you never the see opposite.
The only one that I know of is this guy:
Why is that?