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Harmonic Convergence
These are all the avatars that we know about so far, or at the very least have had a clear view of them.
From left to right: Korra, Aang, Roku, Kyoshi, Kuruk, Yangchen, “Unnamed Firebender” and Wan.
The spirits Raava and Vaatu are in the background.
I got the idea for the Yin and Yang effect from a GIF that's been floating around Tumblr for the last week. :)