There used to be many different pantheons. The Greeks. The Romans. The Egyptians. The Norse. The Aztec. The Hindu. The Japanese. And many more. Now, they are gone. Now, there is only one pantheon. The Merged.
For many years, the pantheons were ignorant of each other; only their kings knew that the others existed. It was meant to stay that way until the Ending of Days. However, Zeus decided that the pantheons united could better stand against their foes, and brought the other kings around to his point of view. One by one, the kings decided to meet. Horus was the first to agree. Odin was the last. It was decided that they would meet at Mt. Olympus.
And so they came. After the surprise wore off, bonds quickly formed between the pantheons. Hermes and Loki became great friends. Athena and Thoth discussed their studies. Poseidon and Ryujin formed a friendly rivalry. But it was not only bonds of friendship that were created that day.
Attraction blossomed between many. Athena forsook her vows for Loki. Zeus grew enamored of Isis. Amaterasu became fond of Vayu. There were many more pairings, both likely and unlikely. These romances produced children, raised in secret. And, as Greek legend dictated, those children rose against their parents and overthrew them. Unlike the legends, however, the Merged gods and goddesses were merciful. If they swore upon the River Styx never to rise against their children, the Merged would let their parents live.
And so, the pantheons of the world fell to the Merged. Some gods refused to bow to their children, and they were destroyed. Others took their vows and lived with their children in peace. All who bent the knee to the Merged were spared, be they god or titan, monster or Jotunn.
The old world was gone. A new world, governed by new gods, had come. Now it was time... to live out their fate.
Your character can be the child of any two gods, and may be the god of anything you want.
So, what d'you think?