I don't think the "Distaff Counterpart" is about gender equality. There have been plenty of unique powerful female characters since the 60s and 70s. In Marvel for example, Sue Storm, Wasp, Black Widow, Scarlet Witch and Ms. Marvel.
I think Ms. Male is a kind of fetishism that probably has been proven as a good way to sell books (probably to young males). I can't think of any famous female heroes that have been made masculine.
Maybe found some here:
http://www.comicvine.com/profile/fod...erparts/40750/
http://allthetropes.wikia.com/wiki/Distaff_Counterpart "Think of me as you with a vagina."—Alex, Up in the Air
"Distaff" means "female". Therefore, the inverse of this (a male counterpart to an existing female character or Always Female trope) is technically and traditionally a Spear Counterpart
The new
Ghostbusters movie is a great big distaff switch:
https://thedissolve.com/news/5029-dueling-ghostbusters/