Board Thread:Magnus Chase & the Gods of Asgard/@comment-25305489-20151223051502/@comment-1515612-20151224181141

They exist by avoiding each other. They seem to all have some central place of power (NYC, Boston, Egypt). Rick has never talked about the problems of overlapping functions, but most likely whoever you believe in influences things such as a thunderstorm: It could be Zeus for CHB, Jupiter for CJ, or Thor controlling it for MC.

The powers don't bother with each other because then they will probably destroy the whole entire world fighting with each other. The mythologies are only relevant if you believe in them. Adding any kind of God would piss millions of readers, so Rick will never add it. They've stated that you see whatever you believe in (preacher in the Underworld thinks he is in Hell).

And RR seems to only write about about mythologies he knows well, so I don't think he'll do a Japanese one. Just read Noragami instead, lol.