Avatar the Last Airbender Book 2 Earth Michael Dante DiMartino & Bryan Konietzko
Hm. GOOD. While the first season takes its time setting up characters and the main narrative thrust, it still retained a level of innocence that was sweet. This second season does a GOOD job maturing every plot line, and beginning to tease at (what I believe to be) the main theme to this show: everyone is capable of great good and great evil. We see that the previously monolithically evil Fire Nation has good people, and the 'good guys' are capable of being evil. Allowing this level of complexity is so refreshing and adorable. My sister is loving it, and with good reason.