>>107996639If we're going full downer. That's just the start. Aang fails to bring a lasting peace. The wounds are just too deep. Too much is invested. He dies frustrated, in isolation, wondering if the next Avatar can make a difference, the only thing keeping him going in the end is the idea of a better world for his kids.
And the next Avatar is born. She's supposed to be a water bender, but she was born wrong. Her mother was a water bender. Her father was a fire bender. Her entire childhood was one of ostracism with only her grandmother really bothering to care about her as her mother could barely stand to look at her. All she knew was a deep resentment of the father she never knew. The anger leads to her developing fire bending first. Now, everyone likes her less, and, because her dad was some fire bender, they think she's just a freakish reminder of the crimes of the Fire Nation.
So, she runs away. She wants to find the Avatar, unaware of his death, to fix her. He bent the Firelord, maybe he can bend her. So, she tracks him down to a little island, and, there he is, the Last Air Bender. Only, it's not. It's his son in the spitting image tending the grave of Aang and Katara, his parents.
Aang's son wanting to meet his reincarnated father and the Avatar wanting to find the 'real' Avatar set off on an adventure with Aang Jr. acting as a mentor to new Avatar. Its when they finally meet her father that the truth comes out.
Her dad isn't a fire bender. He's just a guy that got lost. He never forced himself on her mother, they were in love and wanted to elope. Her mother's depression was from being abandoned, and she just reminded her of it.
From there, her worldview shattered, she wanders in a haze. Along the way, she collects other people broken by a world torn apart until she eventually begins to pull together and get over herself coming to realize in a group of mixed people that while bending may be split, the people are ultimately one.