Guru Pathik, who featured in a few episodes towards the end of season 2 (Book 2: Earth) of Avatar: The Last Airbender, doesn't appear to come from any of the four nations of that universe. The linked wiki page even says "his nationality was unclear", but then goes on to talk about not considering himself of any nation, which is not what I'm asking.

From a racial point of view (meaning I'm not interested in whether he considered himself of any of the nations politically or ideologically or anything like that; I'm interesting in what nation he was from biologically), what nationality did he belong from in-universe? Out-of-universe, he's pretty obviously an Indian man, but as far as I'm aware, no-one else in-universe resembles an Indian man.

Generally speaking, the Fire Nation resembles the Japanese, the Earth Kingdom resembles the Chinese, and Water tribes resemble Inuits, so none of those seem like good fits. He was associated with the Air Nomads, but looking at Aang, and from flashbacks and such of Airbenders, none of the Air Nomads appear to resemble Indians, so unless there are people who don't come from one of the four nations (although it's strongly implied, if not outright stated, that everyone does come from one of the four nations), what in-universe nation would have what looks like an Indian man from real life?