Redeads. I believe they are misunderstood.
I'm not too keen on the lore of the Redeads, but if, like the name and their appearance suggests, they are basically zombies - damned to roam Hyrule in their corpse form, unable to move on to the other side. They apparently are forced by Ganon to live in the dark corners of Hyrule in dungeons, pits, and other awful prisons. There they wait... for years. For what reason? What reason is there left to exist? The chance to move on. The chance to go home. So there they wait, as their orders probably demand. "Wait for the child in green," Ganon or one of his commanding officers probably demanded, "And I will give you your freedom."
So, there they lurk in the shadows... yearning for nothing more than to move on.
One day, a lonely Redead, unable to speak in the common tongue anymore, and only groan with the agony of an glorious age of Hyrule now all but lost, they wait. Wait for their one chance to move on. Enter: the child in green. A 'hero,' apparently. This is his chance.
He leaps forward, hoping to kill the child; it's his only chance.
...but Link strikes him down, with ne'ery another though.
The cycle continues, because the dark magic Ganon has placed on him causes him to resurrect again, in the damned world of Hyrule, once again.
To wait for the Hero... again.
Misunderstood.