Actually, Knai, the Coatl already exist as a pretender choice for MA Mictlan. Called the lawgiver. But he is shape shifted into human form in pretender selection. You can shift him back if you chose him.
And I am still surprised over the composition of some indyprovinces. Yesterday in a test game I stumbled over Pazuzu the demon lord as an indy commander guarding a desert and kitted with bad SC equipment.
I have never seen that one before.