first of all, you cannot forget that mlp is in the grand scheme of things a large commercial for plastic horses marketed towords young girls, not to mention that the show is more then 5 seasons in and currently the mane 6 are set in stone. theres the factual answer as for background characters, i think it would be meaningless to add background characters just for the sake of having more males. even if the show contained all males and people tried to shoehorn in females just for the sake of having females(ahem ghostbusters), it would annoy me, especially if it took away from the meaningful writing(AHEM GHOSTBUSTERS). As it stands, the show is fine. I have no reason to want to shoehorn males into the show.