Raavaatu

Raavaatu is the het ship between Vaatu and Raava from The Legend of Korra fandom.

Canon
Raava and Vaatu are natural enemies. Raava is a spirit of light and order that seeks to protect life and maintain balance in the world, while Vaatu is a spirit of darkness and chaos tat seeks to spread chaos and cover the world in darkness. The two are always fighting and have a final battle that takes place every ten thousand years during the Harmonic Convergence. When one dies, the one who dies is eventually reborn within the other spirit, but this is a gradual process that takes place over ten thousand years.

Raava and Vaatu eventually fought in the Spirit Wilds, with the former gaining the upper hand. Everything changed, however, when a human named Wan arrived and was tricked by Vaatu into separating them. Raava made it her goal to chase him down and stop him from spreading darkness and destroying all of humanity. Eventually, Wan decided to help her. At the Harmonic Convergence, the two lost badly until they fused permanently. Once fused, Wan and Raava were able to seal Vaatu into the Tree of Time. He would be trapped there for ten thousand years.

Ten thousand years later, the Avatar Korra was tricked into opening the Spirit Portals before the Harmonic Convergence, allowing Vaatu to escape. Korra ended up with amnesia and had to connect with Raava, who showed her the truth about Vaatu. Vaatu managed to escape and fuse with Korra's uncle Unalaq. Korra was about to be crushed in a rift until Raava spoke to her and told her that Vaatu couldn't win. After Korra escaped, Vaatu was able to extract Raava from Korra, and Unalaq killed her. However, with Jinora's help, Korra was able to pull Raava out of Vaatu, allowing her to defeat him.

Fanon
Raavaatu is a very popular ship in the Legend of Korra. Despite the fact that they are eternal enemies, many ship them together for balance and the fact that they represent Yin and Yang. The fact that they cannot really exist without each other also fuels this ship. Many fans like to portray Raava and Vaatu in humanoid form, and some do so while creating fanon for this ship.

Fandom

 * FAN FICTION
 * Raava/Vaatu tag on FanFiction.net
 * Raava/Vaatu tag on FanFiction.net

Trivia

 * Vaatu and Raava are supposed to represent Yin and Yang, although the genders are reversed.