I have, for everyone’s convenience, compiled a list of all the characters in ATLA and LOK that are white. Make sure to keep a copy of this list on file for future reference in case there’s ever any more confusion on the matter.
Actually, question, what would the Air Nomads be considered?
Source: Avatar: the Last Airbender art book
“However, once we had the concept of the four nations in place, it made more sense that Aang would be a young monk in the Air Nation, a peaceful society inspired by Tibetan and Buddhist cultures.” — Michael Dante DiMartino; page 14 (emphasis mine).