It has come to my attention that the male and female versions of classes in this game are not just gender swaps, but actually separate and different characters:
http://dungeonfighter.nexon.net/GameGuide/Characters.aspx
As you can see on the official site, male fighter and female fighter are treated as separate characters, same for male gunner and female gunner.
The character tags may have to be adjusted accordingly:
male_fighter_(dungeon_and_fighter)
female_fighter_(dungeon_and_fighter)
male_gunner__(dungeon_and_fighter)
female_gunner_(dungeon_and_fighter)
Updated