The Childlike Empress is the monarch of Fantasia, who resides in the Ivory Tower place in the heart of the realm. Although she is nominally the ruler of Fantasia, she does not command a political system nor does she enforce her authority, and in fact, rarely interacts with the outside world.
She is the living emodiment of Fantasia's life force; should she die, Fantasia and all Fantasians would ease to exist. She is played by Lupita Nyong'o.