But the F.E.V does not change gender, therefor if he was a woman, he would not have pecs, nor a manly voice. Steroids does change breast size but does not affect voice that greatly (it would deepen but not that drastically). Even if Fawkes was a girl, I would still pretend that he was a guy cause that would be awkward to walk around with a green woman, who is taking F.E.V or steroids and is carrying a gatling laser.