[quote=notdeadyet]
No... I was hoping derp's char would help me some... Im still firing blanks. XD ive been lurking for days hoping inspiration would smack me across the face. Alas, i have had none yet. Buut.... I had an idea. I just know it would have been rejected. I wanted to make a cat xD
[/quote]

At least for the first time I'm not going to twist the world/universe that much.
Ret-conning just allowed for new characters, and abolishing the sex and age limits just seemed practical and more open.
But adding sentient animals will go to such a level I wouldn't feel right calling it Madoka Magica anymore.

However, a person who identifies/feels like an animal is fine. We have furries like that in the real world (and honestly, Madoka Magica is an anime. An anime about freaking magical girls. I don't think a furry is much of a stretch), just write your cat character as you wanted to but remember that they're biologically a human.