This is one of the first things that I thought of when I saw that Book 4 of LOK would be set three years later.
If you were twelve when ATLA first came out, then nine year later, you’re going to be twenty-one when LOK ends. Which means that you were the same age as Aang when ATLA started and the same age as Korra when LOK finished.
And I don’t believe that this is a coincidence at all.
a boy was bullied throughout his childhood for being gay and the principal of his school said that if he was to act so openly gay he should expect that kind of treatment. The school board did nothing about it.
Years later, once he had graduated high school, he and his family sued the school board for not doing anything about his bullying. They won the case and got $900,000.