Answer:
Though I should be unique, you've made most of us the same. I would be stronger, if my characters were stranger.
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
I am neither a guest nor a trespasser in this place. I belong that belongs to me. Where is it?
What goes through towns and over hills but never moves?
Mouth up it gets filled, mouth down it gets empty.
What is always coming but never arrives?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?