The FF Shrine has the best full length portrait of Anima:


It's clear that Anima is two creatures grafted together. I've heard some arguments that the upper half represents the Animus (Rational, Masculine Soul), and the Overdrive represents the Anima (Feminine, Animal Soul); but they both look female to me. At the very least it is an Aeon that is the product of a tortured, conflicted Fayth.

I just noticed this, but Overdrive Anima is wearing golden metallic bracelets, of the same type that her Fayth favored in life.