None of the characters in Avatar: The Last Airbender are white. In The Last Airbender, the movie, they're still not really white, but they're being played by white actors.
I think people are saying Asian for everything because most the show is Asian-based, but there is Inuit too. The writers say it's most heavily based in Chinese culture (everything uses Chinese writing, for example), even for the non-Chinese-inspired people.
It looks like, to me, the three main hero characters are white (Noah looks pretty white in every picture but the ones you linked, IMO). Then you've got Zuko, the main villain (who, yes, turns good, but he's still a bad guy for a lot of it), whose culture was based off of Meiji-era Japan, who is now Indian. The rest of the characters are secondary or just background, and that's where minorities are being cast.
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I think people are saying Asian for everything because most the show is Asian-based, but there is Inuit too. The writers say it's most heavily based in Chinese culture (everything uses Chinese writing, for example), even for the non-Chinese-inspired people.
Racebending has a really good post about it.
It looks like, to me, the three main hero characters are white (Noah looks pretty white in every picture but the ones you linked, IMO). Then you've got Zuko, the main villain (who, yes, turns good, but he's still a bad guy for a lot of it), whose culture was based off of Meiji-era Japan, who is now Indian. The rest of the characters are secondary or just background, and that's where minorities are being cast.