my cowsnake Marion started out as a dude of unknown sort and somehow got Fucked Up By Space In A Way That Made Them Supernatural In Unknown Ways
their first act in the wake of this was to declare "fuck gender" and reshape themselves to their ideal shape, size, and species (i don't know if they were a cow before). after that, they wanted to use what they had been given for the benefit of others, as they're a sweetie like mooself.
They've been Fucked Up By Space in a way that makes them a reality bender sorta sort of entity, and they use it to uplift people and try to smooth out bumps, fill voids, bring happiness and fix things on small, personal scales across infinity and eternity. Jokes about entropy can be made here.
They struggled with the question of identity even after they'd solved gender. What were they, now that they had This Whole Thing Going On? It was a question they weren't ready to really address, and they grabbed onto mythology as a crutch, electing to go with "demon" because it seemed hot tbh.
Spent an indeterminate amount of time (IRL, 2015-2020/1) trying to fit into the box they'd made for themselves, but it really never fit. It was the baggy clothes you wear when you're not comfortable with body and haven't quite cracked the question of why. (very Trans Allegory, as this was almost a second, more complete and true transition for the moo and I)
The big revelation was that they didn't have to know all the answers, it is okay for the universe to be full of unsolved mysteries and for "what am I, really" to be one of them. All they needed was a line that slipped out in passing and came back to hit them like bricks, a riff on a Sagan quote they'd used to flirt with someone:
"If life is a way for the cosmos to know itself, maybe the supernatural is a way for the cosmos to act on that knowledge, to change itself."
That's what they are. They don't know anything further, or more specific, and that's fine with them.
They've recently taken to joking that they're a space cow, and someone pointed out to them that the original myth of the minotaur vibes with that, so they're enjoying that vibe just casually. Not as an answer to who they are, but as a fun way to dress themselves. At some point, they added on the tail of snake because that was fun.