[quote=@Ermine]
Abilities: yes, as appropriate (claws are sharp, prehensile tails can hold things, cat ears pick up more sounds). Modular parts: proportional. "Attribute increases": Nope, bear arms are no stronger than her regular arms. Turn off: Yes, she can just look like a regular person...she just chooses not to. Extra stuff: gills (for breathing ONLY underwater), tails (prehensile or not), and VESTIGIAL wings (replacing her arms) are an option, but no extra limbs.
[/quote]

From that, she's an Ace. The key difference between what makes an Ace and a Joker is whether they look (or can look) "normal" or not. By "choosing" not to makes no difference.