This is William Alexander Månesøn, Prince of the Blue Moon.

When he was a boy he lived with his parents, the King and the Queen of the Blue Moon, in this castle on the Blue Moon. One day he was unlucky enough to fall down from the Blue Moon. Since then he has been wandering all over the earth looking with wonder at everything.

Link to the blog of the Prince of the Blue Moon:

William Alexander Månesøn - Tales from the Galaxy

Unfortunately, the blog is written in Danish, a language spoken by very few people and very difficult to learn. Sorry.