Avatar: The Last Airbender was released on Nickelodeon several years ago as a kids’ cartoon, but as fans of the series will attest, it is more than simply a kids’ show. The themes within the series are complex and ring true even while re-watching the series as an adult.
What makes for an effective antagonist?
Redemption arcs in fiction usually go one of two ways: either the character in question realizes how horrible they’ve been and makes up for their actions with good deeds (usually by helping the hero with their endeavors), OR they regret all the horrible things they’ve done and are immediately killed off right after that. Sadly, the second path is seen more often than the first, and it’s not a very good arc at all.