Answer:
He's small but he can climb a tower.
It's tough as nails, Or soft as snow. People use it for their rink, Some just put in their drink.
You use it between your head and your toes, the more it works the thinner it grows. What is it?
Sometimes imaginary and sometimes real, sometimes they are the closest and dearest person outside the family. Who are they?
What goes through a door but never goes in and never comes out?
It is something you will never see again.