"Racial Impact" - A Last Airbender Commentary.

An excellent serial write-up analysing each character, between both animated and movie versions. Without spoiling too much of the articles (aside from full titles, of course), the links are below:

Racial Impact (Part 1): Being Amazing and Asian is Not Enough

Racial Impact (Part 2): The Barbification of Katara

Racial Impact (Part 3): The Evil Brown Fire Nation

The series hasn't ended yet, so I'll be adding more links as they come.