Originally Posted by
Anymage
If gods could change quiddities, there'd be some with of that. The fact that you don't have any strangely out-of-pantheon gods (like a western zodiac animal having the yellow aura of the norse northeners) strongly implies that you're stuck with the quiddity you were born with.
And while in theory nothing would stop a blue western god from hanging out with the yellow northeners, gods squabble. So long as it's just intra-pantheon squabbling, any resulting snarl-like manifestations are single color and easily dealt with. Inter-pantheon dealings are formal and removed because the risks are so high. If someone with a different color starts hanging out like they were family, they'll most likely start squabbling like family but the risks will be much worse.