Stories never really end. Once creators release their work into the world, that universe and the characters that live there don't entirely belong to them anymore because those elements now live rent-free in the minds of fans for the rest of their lives, often asking, "what if?". The universe created in the animated series Avatar: The Last Airbender and The Legend of Korra is a prime example of this fandom phenomenon known as headcanon.
It's impossible for storytellers to fill in every single gap and preemptively answer any questions someone down the line might have, and that's totally fine! A lot of the time, fans will come up with a cleaner, simpler, and more in-depth solution because they've spent so much time absorbing and obsessing over the final product. This is a collection of those headcanons for Avatar and Korra.
Vote up the headcanons that make the most sense to you!