[quote=@Wishful Stray]
Are there any restrictions on Early Egyptian Mythos?
[/quote]

Let's see...

Ra is one of the leaders of the Mythic Accord. He's conflated with Amun, Aten, and Horus (as Ra-Horakhty). This could be explained as Ra's mantle being passed on to different spirits several times or something, depending on who plays as him.

Apep is one of the leaders of the Reclamation of Chaos, and Ammit is one of its major members.

Set is one of the leaders of the Millennial Union, and Bastet is one of its major members.

Aside from these, there are no restrictions. You can play as any of these spirits, as long as you don't go against anything I said above.