If we're incorporating other pantheons, I wouldn't mind calling Enki if that's acceptable. I'm not sure if he's above the threshold to be considered the head of the pantheon (being a creation god, but not the actual figurehead of the Sumerian pantheon.) Let me know either way and I'll either pick somebody else or start planning :3

Of course, even as a creation god, he's too old to have any crazy powers or anything right away. I'd probably play him as totally powerless at the start.