Avatar Aang failed to defeat Firelord Ozai during the Comet. Ozai was contested by The Order of The White Lotus at Ba Sing Se, and was thus unable to decimate the city and massacre its denizens. Nonetheless, he incinerated much of the Earth Kingdom en route to the capital. Fire and chaos reign.
Aang survived the battle and receded into the shadows. For the rest of his life, he allied with various resistance forces to undermine the Fire Nation’s total victory. He lived to the age of 65 (as he does in the canon universe).
Katara and Zuko managed to defeat Azula, yet fled in search of Aang upon hearing of Ozai’s return. They joined Aang’s resistance. Katara and Master Pakku defended the Southern Water Tribe. In place of a city, they built a fortress in the South. Zuko and Iroh, undercover in the Fire Nation, coordinated anti-Fire Nation rallies.
Toph and Bumi retook Earth Kingdom lands. Omashu functioned as the Earth Kingdom’s central military base.
War nonetheless continued for 70 years. The Water Tribe, bolstered by the Avatar and renewed efforts to subvert the Fire Nation, expanded its influence.
Out of balance, the world careens towards a battle of Water and Fire.
Korra is born to Tonraq in the South (as his backstory remains in tact). Unalaq, Chief of the North, avails in joining the young Avatar’s legion of masters. Unalaq (as in the canon) conspires to fuse with Vaatu as a means to an end of The Endless War (i.e. The Hundred Year War after Aang fails to end it). Unalaq believes he can manipulate the Spirit of Darkness and manifest his design for a new world order.
With his obvious allegiance to the Water Tribe and his aims to overthrow Firelord Azula (now 85), Unalaq convinces teen Korra to train with him and unlock her true spiritual potential by the time of Harmonic Convergence. She masters Water, Earth, and Fire.
Tenzin refuses to train the Avatar. Unalaq is unfazed, and continues to pervert Korra’s mind. He manages to manipulate Korra’s Spiritual energy to unlock the Avatar State.
Katara, having trained Korra since she was a child, observes this exercise in horror. She severs ties with the Avatar.
Having learned of Avatar Wan from Unalaq, Korra is indoctrinated to the point where she sees Unalaq’s plan as the only resolution. Resistance forces have dwindled too long to muster the kind of force necessary to invade the Fire Nation and upend the Firelord’s reign.
Heaviness weighs in her heart as she parts with Katara, yet she stands unerringly by her uncle’s side.
The moment for change arrives. During Harmonic Convergence, Unalaq bonds with Vaatu.
Korra and Unalaq, Avatars Light and Dark, rain destruction upon the Fire Nation. Avatar Korra decimates the Fire Nation Capital, uprooting its underground stronghold. Firelord Azula confronts Avatar Unalaq, while Avatar Korra makes quick work of the Fire Nation’s military bastions. Azula, advanced in age as she is, stands her ground for an impressive display of fireworks. Yet she is no match for Unalaq. Her death is brutal.
Korra and Unalaq castrate the Fire Nation. Firelord Zuko assumes the throne as a figure head. All power issues from the Water Tribe. Winter too creeps down from the North, and Unalaq affixes Water Tribe military posts in the Earth Kingdom and Fire Nation. Unalaq’s vice grip on the South all but strangles Southern tribe members.
Years of unstable “reconstruction” pass. Complicit in Unalaq’s repositioning of power, Korra is riddled with guilt. She has supplanted the volatile, chaotic reign of the Fire Nation with a new, chilling Water Tribe fascism.
Avatar Aang visits her in a dream, instructing her to seek out The Order of The White Lotus.
After the failed Reconquest of Ba Sing Se, the former Order reinforced its underground network in the Earth Kingdom. In the 70 years after Sozin’s Comet’s return, the Order spread to the Fire Nation and the Water Tribe. Members in both these latter nations opposed military expansion and sought to loosen their respective nations’ holds on the world. After the Glorious Liberation, as Avatar Unalaq so called his and Korra’s assault on the Fire Nation, efforts doubled.
Korra joins the Order, underground in the Ptola Mountain Range of the former Southern Air Temple. Upon reuniting with Katara, she breaks down. Her experience is humbling, a visceral expurgation of angst. In this moment of emotional stress she enters the Avatar State as a trigger for the first time. She wreaks havoc on the Order’s secret base. Master Katara, guarded by her Waterbending, reaches Korra and heals her mind. Aang manifests before Korra and Katara and Tenzin. He beseeches that they stop Unalaq.
Korra begins her training with Tenzin. Finally, she recenters on inner peace. Raava unveils herself to Korra and the two foster a bond unlike the Avatar had seen since Wan’s time.
Tenzin and Korra, in cooperation with Master Katara, Sifu Toph Beifong, Firelord Zuko, Special Operatives Leader Lin Beifong, resurface the organization and publicly declare opposition to Avatar Unalaq.
A new battle ensues as Order members emerge in the thousands. Water Tribe forces endure the tides of battle as numbers surge. Yet, the global revolution overwhelms Northern troops in the Southern Water Tribe, the S. Earth Kingdom, and the Fire Nation.
The Order of the White Lotus storms from the South to the North in its fleet of Airships. Master Katara dispatches hundreds of Waterbenders. After troubles with Northern strongholds in the N. Mountains of the Earth Kingdom, The Order arrives at the Northern Water Tribe. In an impressive display, Master Katara unmakes the Walls of the Northern Water Tribe citadel.
The Order storms the city. Elite as the Water Tribe’s domestic forces prove to be, The Beifong’s, Zuko, Katara, and Tenzin subdue them with ease. The Order’s highest members escort the Avatar to Unalaq’s throne room.
Korra and Unalaq engage in a Clash of The Two Avatars.
Korra emerges victorious and kills Avatar Unalaq, freeing Vaatu. Vaatu, seeing no escape from the Avatar and her allies, dissolves into the Universe to be reincarnated and begin a line of Dark Avatars.
Attack on Titan AU where the main characters are benders using bending-enhanced 3D maneuver gears.
- Waterbenders have a gear equipped with a sizable water tank. They propel themselves with steam or water jets from behind and latch onto buildings with water tendrils projected from the front and then frozen onto the surface of things as an ice grapple. Their water tanks are also designed and attached so, if need be, other Waterbenders can hurl them to safety and out of harm’s way.
- Earthbenders, or traditional ones at least, tend to maintain the walls or work in the police force on the ground. Metalbenders take to the skies with an enhanced 3D gear: longer cables, extra sets of them too, no need for propulsion.
- Firebenders have an steam engine type fixture fastened to their maneuver gears so they can propel themselves with Firebending. There is also the option to channel the propulsion into an enhanced fire jet to be used as a last ditch booster. Their gears have the traditional cable design as well for support.
- Airbenders pretty much fuck shit up on their own since they can fly, but for longer journeys with the Survey Corps, (instead of a glider) Airbenders use a sail-type gear. Anchored to their hips, they have two small wing like sails on the side and a larger, flat tail-fan sail behind them, which allows them sustained flight.
These ideas are obvi to compensate for the fact that benders, save for Airbenders, can’t really get airborne all that easily. Sure Waterbenders can water spout it up, but without a massive amount of water it’s not an option. Oh and Earthbenders can rocket themselves high into the sky, but once they’re there its all what goes up comes down. Firebenders only have limited jet propulsion powers and can only free fly while Comet-powered. Yeah, so this tech would compensate for that, because even with bending, it’d be pretty hard to strike down the Titans from such a terrible angle on the ground.
There you have it, just an idea!
Oh, and nonbenders use the SnK standard gear!
Obvi each bender would attack with different slicing techniques. Waterbenders would be most effective in halting with ice and finishing with slicing water scythes. Traditional Earthbenders could also halt and provide ground defense, or even crush titans from atop the walls. Metalbenders would be particularly keen on finishing, being able to convert their cables into slicers. Firebenders would just have to burn shit I suppose.
Hmmm oh and then Titans COULD BE BENDERS TOO! Only some of the unintelligent ones would bend and just like wreak havoc with no purpose or form to their abilities. The conscious Titan-human shifters would have vastly augmented bending (like Korra or Unalaq in their giant Spirit forms) and they would FUCK SHIT UP.