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One of the many great themes in Avatar is the idea of second chances:

  • Aang gets a second, even multiple, chances at saving the world
  • Zuko gets a second chance at redemption
  • Katara gets a second, even multiple, chances to protect someone 
  • Sokka gets a second chance to be a leader 
  • Iroh gets a second chance to retake Ba Sing Se (with a new purpose)
  • Iroh and Zuko both get a second chance at having a father/son relationship, with Iroh getting a second chance at being a father (or rather, father figure)