Keepers of the Balance
The Demigods, mostly, started out as humans, but some were other creatures as well. Demigods are actually very rare. They are not as powerful as the other gods, but they do have considerable power, and they usually have a shrine or two dedicated to them. Demigods usually take more of an interest in the world than the other gods and often act as messengers between the two.
This list, for being incomplete, is actually pretty close to being complete.