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.