Majora

Majora has never, as of now, appeared in a Zelda game and is only mentioned in Majora's Mask. The mask itself was created from the remains of the beast that was Majora, which was in fact itelf created by the same tribe. Its recently been debated that the tribe responsible for creating Majora is in fact the Twili, as Midna and her armour both bare a notable resemblance to the final mask. It is still not known for certain what Majora look like, but it is referred to as a beast, similar to the reference to Wolf Link and Pig Ganon as beasts.

Adding to speculation, a short text that is presented as a plot point the game, Majora's Mask, states "...And the Gods had a friend..." this insinuates that Majora is in fact a Deity, with God like powers. It is also believed that Majora is to the world of Hyrule what the Devil is to Christianity. Because of Majora's ambiguity, it can't be said if he or she has ever encountered any releivent characters in the timeline of Zelda or how well or envolved he or she may be in the overall events of the game.

The Skull Kid, wearing the Mask of Majora, still doesn't take on Majora's mind or personality, he is simply possessed by the Mask, created from the beast's remains. Whether or not Majora will ever make a complete appearance or otherwise is unknown.