I think the main issue is that female champions are limited in what they can be and still be interesting. A female wolf would be ten times more awesome as a male wolf, a female robot would be as a male, and so on, because we typically see these supernatural and strange beings as being extremely beastly, and everyone knows men are more beastly than women. That being said I think they need to keep the general female form, but add interesting characteristics (other than huge tracts of land). The generic half-spider-half-lady monster would work well. But anything completely unhuman will be better accepted as a male. That's what I think anyways.