Answer:
I am shared by goats devils and unicorns.
I am the only thing that always tells the truth. I show off everything that I see. I come in all shapes and sizes. What am I?
Sometimes I am white, sometimes I am dark. Most people love me. What am I?
I can be hairy and itchy all over. I can be the scariest thing you have ever seen. I stand in the middle of nowhere, hanging on a stick. What am I?
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down, but should not be forgotten. What am I?
As round as an apple. As deep as a cup. All the king's horses can't pull it up.