Making an E102 Chao is not possible. You can make a Chao resemble Sonic when its the Run type but that's the only character a Chao can resemble.
There were 3 promotional chao that were available: A Tails one, a Knuckles one, and an Amy one.
Either get a two tone grey chao and make him a shadow chao or a two tone blue or sky blue chao and make either of them a shadow chao or a two tone black chao.
No you can not make a chao age faster
you can't really make a gold chao unless it's ancestors were gold chao.
You can only make hero and dark chao in SAB2. Also Sonic chao are neutral so if you give your chao a lot of run animals you will get a Sonic chao.
You can't make a Chaos Chao look like Sonic, but you can make a regular Chao look like him.
E102
Yes
It just the way the game goes.
make your chao a normal run type
Just make a knights chao, just make it get red chaos drives instead.
The E-number for tartrazine is E102. It is a synthetic yellow color additive that is commonly used in food products.
Buy a white Chao from the black market