APPROVAL PENDING
This sounds like a creative way of looking at "shapeshifting" (and reminds me of Tonks from Harry Potter, but that is OT), and I like the restrictions here. I'm just clarifying that her shapeshifting based on how you describe it is that she gains similar features, but still looks like herself in a way? Like if she spends time around Roxas, she could get blond hair, but she would look like "Xion with blond hair." Or are you meaning this in a different way?