wc alligator said:
Black and Asian Norse gods?
What?
Well Viking raiders and traders did historically visit quite far south on the west african coastline at some points (as well as the failed colonisation of North America). Likewise Vikings were popular mercenaries in Constantinople, there was the Varangian guard which was a viking bodyguard to the emperors. So it's not completely crazy that Vikings might come in contact with traders from Asia.
However in the comics, Hogun (the one who looks like a mongol) is not actually an Aesir, he's from another pantheon that shares borders/realities with Asgard. He's been accepted as an Asgardian though and eats the golden fruit that grants them immortality. As for Heimdall (black guy with big helmet and weird eyes) well he's white in the comics, so I've got no explaination.