The Man in the Moon is a being who lives in the moon, and a friend of the Fairies.
He has a man's face with a full beard and wrinkles and a jolly expression. It was he who suggested to Queen Lulea that the Fairies give their Magic Cloak to the first unhappy person they met. (Queen Zixi of Ix)
The Man in the Moon also appears in one of the stories collected in Prince Silverwings.