There are 5 Pantheons from what I remember (correct me if I'm wrong).

There's:

Greek

Norse

Chinese/ Asian

Polynesian

And Egyptian

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These are links to help you pick out a god from whatever pantheon and have your oc as their child, a demi-god.

Greek:

https://www.greekmythology.com/Other_Gods/other_gods.html

Norse:

https://godofwar.fandom.com/wiki/Norse_Gods

Chinese/Asian:

https://mythus.fandom.com/wiki/Chinese_mythology

Egyptian:

https://www.britannica.com/list/11-egyptian-gods-and-goddesses

Polynesian:

https://greenglobaltravel.com/hawaiian-mythology-gods-goddesses-legends/