Ah, precious Luna. And what a concept, that even an angel couldn't see thestrals. Could it be not just a fact that he'll never die, but also that he's not dark enough to see such a "dark" creature?

We sort of know what a snake daemon type of person would be, and of course it doesn't truly fit Aziraphale (other than the fact he is hiding something, obviously). But what in hell does a duck daemon say about a person? I hesitate to imagine how Crowley would be perceived by that society! XD And I would pay good money to see a ficlet about that.

The entire third segment... It fits almost eerily well together. "Celestial subject-changing powers". Oh my, yes.