They never really used the Nox very much, even though they were one of the four races the Asgard talked about. I wonder if all that hair and makeup was an issue?
I'd think a few Nox characters could've mirrored Oma's role as an ascended Ancient who bends the rules to help humanity, providing an interesting change when you expect the day to be saved by the intervention of Ancients or Asgard. "Oh, it's a Nox this time!" But they never went there.
Maybe the Nox moved in with the Furlings or something.