Anima should stay female. My concern though is just how they are going to use her. She is a very loaded character with a lot of potential backstory but I'm afraid they're just going to use her as a fairly generic boss monster. I'm not saying they need to basically use her in the same way that she was used in FFX but it would be a real shame if such a cool and interesting character was stripped of that and just slapped somewhere as a boss because she looks cool (which she does, of course).