10. The Legend of Korra (2012-2014)
The Legend of Korra had to follow Avatar: The Last Airbender, which meant starting with impossible expectations and a fanbase ready to find problems. The show responded by aging up everything that made the original work, trading Aang's spiritual journey for Korra's very physical struggles with politics, technology, and what it means to be powerful in a world that might not need you anymore. Each season tackles a different villain with a different ideology, turning the Avatar into someone who has to argue for her own relevance rather than simply accept her destiny. The result feels like growing up in real time, messier and more complex than its predecessor but honest about what that complexity costs. | © Nickelodeon