The Adventures of Alvin the Invisible Boy (en Inglés) - Robert MacKenzie Rossmann

Though invisible to the world, Alvin's heart is bright with dreams of friendship, belonging, and adventure. Each night, he slips quietly into the magical circus, watching acrobats soar and clowns tumble, wishing he could be part of the show.

With the help of a mysterious and magical blue alligator named Azul, Alvin discovers that being unseen doesn't mean being unimportant. In fact, it might just mean he has a special kind of magic all his own.  He becomes "Amazing Invisible Alvin".

This book is a magical A-Z journey about courage, friendship, and talent, with a bit of nonsense thrown in.