I noticed that when you give a Dark Chao Power bottles, he gets ring bracelets on his arms. When you give him green bottles, he gets Shadow's hair. Can you get the Chao to have both rings and hair, and anything else?
Giving a chao enough Chaos Drives (not power bottles) alters its appearance. That's how second evolution works; it can change a chao's look dramatically. There are many varying patterns (usually stripes or coloured fronts), colours and shapes (including hedgehog spines) for every type of chao, but the Shadow chao won't get rings on its arms.

~ Crazy C Lea