Champions of Tymeria
1/2 Demon/Human from the 2nd Dawn War
A 1/2 human 1/2 demon named Thuril. He was a human hero said to have been a general that led the human army vs the demons in the 2nd dawn war.
There is a prophecy indicating a demon prince will save the world from destruction.
The Demon Prince turned traitor on the humans and joined the demons near the end. However, the demons chained him up and tormented him (using him for information against the human army) and he was never treated as a full demon. This is not widely known (actually directly contradicts the common history known to people) but the PCs learned this talking to him after going back in time.