I would love to see Fierce Deity Link return, especially as the antagonist.
The story could be before the events of MM. A warrior becomes very powerful and kills for the gods.. He get rewarded by the gods and gets a seat of power. He names himself The Fierce Diety to get people to worship him. He then uses his new reign of power to bring destruction on the world. Link is told that being in favour of the gos he cannot be destroyed by physical means and that the only way to get rid him is to preserve his soul in something (becomes a mask) stands up to him but needs others to get to him (going through a door or passage way), going through dungeons to get help of some sort. Goes through last dungeon and fights the Fierce Diety and once defeated, traps the Fierce Deity inside the mask.