Answer:
Though I should be unique, you've made most of us the same. I would be stronger, if my characters were stranger.
Once you know it exists, it no longer exists. What is it?
What you do to determine the length of something
I'm a small ring shaped fried cake, often with bavarian cream or fruit filling, and sometimes covered in icing and sprinkles.
Which word contains all 26 letters?
It is something you will never see again.