A crossover of Attack on Titan and Avatar: The Last Airbender. more details inside.

¿Cuandó todo cambio? ¿Cuandó empezó esto? ¿Pórque empezó primero que todo? ¿Algún día acabara? ¿La humanidad podrá despertar, algún día, sin el miedo a ser atacados por esos demonios que tan solo buscan acabar con nuestra existencia? ¿Qué sera primero el fin de la guerra o de la humanidad? ¿Cuál es la causa o razón por la que esto ocurrió? ¿Tendremos oportunidad de salvarnos

After Eren loses control of himself when fighting Annie in Stohess, they disappear into a mysterious new place where there are no Titans threatening humanity's fate. However, a war, this time among humans, is destroying this new World. Alliances and Betrayals will be made, and the fate of both worlds will now depend on both the Avatar and Eren Jaeger. SPOILERS UP TO AOT Ch.97/Ep.63

What started out as a mission to find Zuko's mom ends up into a cascade of tragic events. Team Avatar and Azula gets stuck in Paradis Island with no other option but to join the scouts as an escape route. From what appeared to be an accident at first turned out to be something that was predestined in the first place, a divine will, a mission.

The Crown Prince of the Fire Nation disappeared many years ago along with his mother, Fire Lady Ursa. No one have every found them since their disappearance on the day Fire Lord Azulon died. What happened to them and what would happen if the long lost prince reappeared as a completely different person? Will he aid or end the Avatar?

Titans have appeared in the world of Avatar. Armin and Jean develop a telepathic mind link. Mikasa deduces the identity of the masked vigilante who rescued her. Eren can make things explode with his mind. Jean just can't let Mikasa go. Hange is obsessed. Levi is...Levi. And the Survey Corps thought the titans were bad...until they meet the one responsible for their appearance.

A crack AU where everything is basically the same except Katara and Sokka find Annie in her crystal instead of Aang in his iceberg. Annie does everything in her power to convince everyone that she is not the Avatar. But much to her dismay she ends up journeying across the world with them anyways.

Dans les bois sombres au Nord du Mur Maria, une ombre avance, mettant en marche le destin de l'humanité... Quel sort lui sera réservé ? Comment sa maîtrise le sauvera des titans, et émancipera l'humanité de leur menace ? ( OS, respecte l'univers de Shingeki no kyojin, donc spoils.)

Toph and her team found a place surrounded by walls same as Ba Sing Se and discover that they are not the only ones alive and fighting the Titans. But who are these people anyway? they don't seem to be benders...

A Shingeki no Kyojin/Attack on Titan and Avatar/Legend of Korra crossover, where elements of trade may just be a little too much for two lost souls, slowly gravitating towards each other. LevixMikasa

Aang and his friends have lived peacefully inside the walls, but everything changes when the Titans break through the walls. When Aangs family is killed, not only does he discover he is the last airbender, but he is also able to bend all four elements

L'eau, la terre, le feu, l'air… Au sein des trois Murs protégeant les rescapés de l'humanité, certaines personnes sont dotées du pouvoir de manipuler les énergies naturelles et de se faire Maîtres des éléments. L'ultime technique utilisée par l'armée pour combattre les Titans...

They're just a bunch of kids, fighting to save the world. Drabbles, implied Rivetra.

Levi is the most dangerous criminal in Republic City but when he turns himself in, people start to question his motives. Rhett is the best prison guard they've got and Levi has his eyes on her for she may hold secrets that could destroy the bending world, and Levi's not the only one after them. The problem is, she has no idea she holds these secrets.

When Aang,Korra, and the rest of the gang went on vacation. They end up fighting titans with Eren,Mikasa,and Armin! How will they react to their bending skills. How will the gang react to their fighting abilities. How will they restore the city? Who is that guy holding that tomb? Will the city be destroyed? Will this destruction ever end?

Historia is an airbender when her people are attacked. Ymir is around to protect her.

Humanity lies on the brink of extinction. Hidden behind the sacred walls that mysteriously appeared over 100 years ago, humans struggle to survive, forever living in the fear of Titans. This is a historical report of how I, Prince Zuko, son of Ursa and Fire Lord Ozai, came to be thrust into such an environment. Nothing could have possibly prepared me for the horror that followed.