Avatar: The Last Airbender is based on the Nickelodeon TV show, and lets you play as Aang, Katara, Sokka and Haru.
From the website:
Water. Earth. Fire. Air.
Are you ready to face your destiny?
Journey through 6 exotic locations filled with adventure to help Aang fulfill
his destiny to master the bending arts and become the Avatar—for only
the Avatar can stop the ruthless might of the Fire Nation! Defeat
hordes of bizarre enemies and perform noble deeds on your quest to save