Lunar Children

The Lunar Children are characters from The Legend of Zelda: Majora's Mask. They are five children living on the Moon's grassy plain.

Biography
When Link arrives at the Moon, he finds a grassy field with a tree in the center. The four Lunar Children wearing the masks of Odolwa, Goht, Gyorg, and Twinmold can be found running around, playing in the grass, while a single Lunar Child wearing Majora's Mask can be found sitting under the tree.

Each Lunar Child has his own mini-dungeon that Link must complete in order to receive the Fierce Deity's Mask. In order to access one of these dungeons, Link must give one of the Lunar Children the masks Link has collected during his quest; the number of masks that must be given increases in the same order that the dungeon bosses are defeated (For example, the Odolwa-masked child requires one mask to enter his dungeon and one to leave, all the way up to the child wearing the Twinmold mask, who requires four masks for entering and four for leaving. When Link finally completes all four dungeons and gives up all twenty non-transformation masks, the child wearing Majora's Mask will ask Link if he would like to play a game of "good guys against bad guys." If Link accepts, he is given the Fierce Deity's Mask and is summoned to the chamber where Majora, in its many forms, is battled. The Fierce Deity's Mask is not required to defeat Majora, but by Link having this mask, beating Majora is much easier for him.

Motivation
The four Lunar Children each represent a previous boss and all seem very interested in values like happiness, friendship, truth, and the "right" thing. When confronted at the end of their respective mini-dungeons, the children will ask Link a question dealing with one of the said motives, ask for more masks, and then thank him and ask him another open-ended question. These questions are never answered, as once they are finished, Link is transported back to the field. The children's questions seem innocent and merely curious, possibly implying they themselves are innocent, despite the evil masks on their faces.

Theory
The Lunar Children all bear striking resemblances to younger versions of the Happy Mask Salesman. This, combined with the fact that they all seem to be infatuated with mask selling, leads to the possibility that they are somehow connected to the Happy Mask Salesman. The Happy Mask Salesman may even be a former Lunar Child, who is originally from the Moon.

Another theory is that the Lunar Children are actually manifestations made by Majora, and fashioned after the Happy Mask Salesman himself, due to the Skull Kid's influence while wearing Majora's Mask.