The Childlike Empress (Die Kindliche Kaiserin in German) is the monarch of Fantastica, who resides in the Ivory Tower palace in the heart of the realm. Although she is formally the ruler of Fantastica, she does not command a political system and in fact rarely actually interferes with that world. She does not judge between beautiful and ugly or good and evil, being the embodiment of Fantastica itself, which is why all Fantasticans respect and acknowledge her presence and authority. Should she die, Fantastica and all Fantasticans would cease to exist. The amulet known as 'AURYN' is her emblem, and those who wear it are her messengers and representatives. As explained by Morla the Aged One, her lifetime is not measured in years or in time, but by names. She continuously needs new names, which only a human can give to her by coming to Fantastica. When she begins to need a new name, she begins to fade away, causing the Nothing to appear in Fantastica. She sends Atreyu on the Great Quest, which brings Bastian Balthazar Bux to Fantastica, and Bastian gives her the name of 'Moon Child,' which restores Fantastica and begins the second half of the novel.
Her description is that of an indescribably beautiful young girl, possibly no older than ten, yet known to be much older than the oldest Fantasticans. Her hair is snow-white, as is her gown, and her eyes are the color of gold, earning her the official title Golden-eyed Commander of Wishes.
The role was portrayed by Tami Stronach in Wolfgang Petersen's 1984 adaptation, by Alexandra Johnes in The NeverEnding Story II: The Next Chapter (1990) and by Julie Cox in The NeverEnding Story III (1994). In the movies, her hair is dark, rather than white, and in the first movie, she is dressed like a bride.
http://en.wikipedia.org/wiki/The_NeverEnding_Story_(film)