1.I have a chao and I have been giving it animals for a long time and it hasn't turned immortal. Can you explain why? 2. If it turns immortal and it was a sonic chao will it stay like that?
1. Giving a chao lots of animals doesn't make it a Chaos (immortal) chao. Check the Q&A archives for instructions on how to do so.
2. No, there are only three kinds of Chaos chao, and each has its own specific look.

~ Crazy C Lea