The Adventures of Beekle: The Unimaginary Friend
“Ladies and Gentlemen: The Beekles!”
There's an island where all imaginary friends are born, waiting to be imagined by children, and there's an imaginary friend who keeps waiting but is never imagined, so eventually he leaves and sails away on a boat and it's scary. He goes to the real world and climbs to the top of a tree but nobody comes, then somebody comes and asks for his help, and he realizes that she is his child. They play together and the shy little girl starts making other friends.
It's cute. It's a very imaginative story. The artwork is gorgeous. It speaks to the shy little introvert in everyone, and talks about having the courage to do things that are difficult and that nobody else has ever done.