Proloque:

After the death of Korra the world has began to change drastically, with all 5 nations now without the guidance of an Avatar, all nations began to relay on a new guidance under a different leaders.

The mighty Fire Nation given the power of its navy and influence began to lead the other nation in United Nations or NATO, it used to be a monarchy but after the last heir of Zuko died they slowly began to adapt United Parlimentary Constitutional monarchy away from their absolute monarchy to avoid abuse in power & power grabbing and was now named United Fire Nation.

The Water tribe is now divided into 2 Independent Nations has Democratic People's Republic of Northern Water Tribe & the Republic of Southern Water Tribe. Two Nations are now under ceasefire after the death of Korra another civil war errupted but this time involving other nations that was called the Water Tribes War, now both nations are on standoff, with Northern Water Tribe shutting its doors to all nations except the Earth Kingdom, who was the only nation to support Northern Water Tribe. While Southern Water Tribe was able to fully develop following its open door trades to other nations & a new source of power & resources deep underground with newly discovered oil depots the country flourished. While the Northern Water Tribe build more ice walls as high as that wall resembles Ba Sing Se in a more larger form.

The Earth Kingdom now divded into 3 Nations

Earth Kingdom the larger nation that has been a fully develop nation more powerful that it ever was, with the full exploitation of its larger area, it was able to maximized its mines for coal, oil & it's controversial Spirit Vines Power Plant. But it's form of govern has now been changed from being a monarch to a authoritarian and corporatist & militaristic form of Leadership. It has now managed to rival Fire Nation it both economy & militar power perhaps more.

Middle Earth Sand City is more of a city and not a nation, the form of government differs from Earth Kingdom given its special administrative powers to govern its own people, but they still provide taxes & supplies to Earth Kingdom and work more as a capitalist nation, it has flourished deeply because of its high oil and gas reserves found deep beneath the sands, that has been used by around the world to power the modern era.

The Swamp Earth Kingdom or the city of Foggy Swamp is an independent nation that is not under the control of Earth Kingdom a brief civil war errupted around the four great nations that each with it's reculsive area it was able to avoid the full force of the Earth Kingdom, the previous monarchs of Earth Kingdom was pushed out of power and sought refuge under the Swamp Earth Kingdom until they this area can only be access by boat. The remaining royal descendants are still waiting for right to reclaim back power, but with the limited power of Swamp Kingdom to take back and conquer Earth Kingdom and no supporters in the Earth Kingdom it will be a daunting task.

United Republic of Nations with its easy access to all nations as the center point of commerce had been rapidly developing, it has now turned to be the most crowded and popular place for trade & business it has Metalbending Police Force as it's only military power but has strong allies with Fire Nation & the South Water Tribe Nation, to back it's lack of military presence. It is also the only country to have least reliance on benders. It has underground trains, electric airplanes it is the most industrious country in the world.

Air Nomads with the recent changes in the Harmonic Convergence a new breed of Air Benders emerge, something that only Avatar Aang can dream of, but with the emergence of this newly Air Benders from different cultural backgrounds , it was not able to fully consolidate a central system of governance like it was once before. The children of Tenzin under Jinora, Ikki, Meelo, Rohan inherit all 4 Air temples but had differ to their own set of principles with their different interpretations of spirituality.

Jinora- Inherited the Northern Air Temple and with it she established Jinorism a movement that focuses on spirituality she found this movement after her husband Kai died from the war that they were trying to prevent, and with that misery she was distanced herself to the world until she became a spirit herself. The Air Benders under this temple are reclusive and distance they are the onced that focuses on being isolated and separated to the world cause, they feel that the only true balance is to let things be, letting go of one's earthly tether. They are the only Air Benders that can all levitate given the highest in all Temples, Air Benders affiated with this principles can all levitate like Guru Laghima & Zaheer most of them are also outcast of societies they are the onces with physical disabilities that had found true spirituality with makes them all capable of spiritual projection technique. They avoid fights & conflict they speak less and do less they meditate through prayers all the time.

Ikki-Inherited the Southern Air Temple out of all Tenzin's Children Ikki possessed the most caring & self giving traits of all Air Bending Master she is also the most outspoken out of all the them, she believed that became popular on her selfless act of accepting orphans to the temple from all over the world, she was called Mother Ikki, she fought through conflict but through words & politics, she was a world leader & part of the council of United Nations, she never used her airbending skills as much when she became a political figure and when she died her predecessors carried her principle of giving and taking care of the sick & oppress, She profess a vow "wholehearted free service to the poorest of the poor." She became a symbol and an organization was structured based on her principle of giving help to all those who need help it was called "Air Cross" with 4 symbols of air in all sides. Southern Air Temple became a refuge and a general hospital & orphanage for the whole world.

Meelo-Inherited the Western Air Temple and with his principle of bringing true world peace across the world he created the International Criminal Police Organization or INTERPOL out of all Tenzin's children he is the one that totally reshaped how Air Benders are perceived before, The Air Nomads detached themselves from worldly problems and concerns; finding peace and freedom was the key to solving their difficulties in life. Airbenders continually sought spiritual enlightenment, but Meelo believed that Air Benders should be the peace keepers of the world he believes that avoiding conflict lead to the extinction of the Air Nomads, bringing chaos & conflict to the world, he believes that if Aang only fought and not runaway he could have prevented the Air Nomad Genocide, the Western Air Temple has now been changed to Western Air Base, acting as the International Police of the whole world, his base also accepted not just Air Benders but all 4 Benders combined, they act as the special police operations of the world, with universal jurisdiction on all Nations except for Democratic People's Republic of Northern Water Tribe which despite being close it has no access or jurisdiction on its air space. Meelo treated the Temple more as a base they called him General Meelo "Desert Fox" with Air ships filling up the sky and Air Bishon Stables, it's the only Air Temple with an Air Cannon Installed and wear a full battle gear. It's soldiers have air swords, air blades & air guns used by all. All other benders like Earth, Water & Fire has an insignia differentiating them to the Air Benders, with equipments made to enhanced their fighting capacity Earth Benders have giant gourd carrying sands, Oil for Fire Benders & Water for Water Benders. They also have a armored brigades with Lazer Cannon Tanks like the M4 Sherman or the Meelo Medium Tanks.

Rohan the Mute-inherited the Eastern Air Temple, Tenzin noticed that Rohan though mute was the most powerful of his children, he has the special spiritual connection of what Jinora had, the Courage & Aggresiveness of Meelo & the selfless love & caring wisdom of Ikki, his greatest skill is silence he can walk & used airbending skills without making too much noise, a skill that used by Meelo for time during his campaigns for world peace when all other nations were having civil wars on their own territories, Rohan had his own special group of fellow mute & deaf that are benders, they communicate through sign language and develop a skills called Ninjutsu or Ninpo a skills focused on gathering information and techniques of non-detection, avoidance, and misdirection. But through time Rohan become more defiant of what Meelo is fighting for, he became to conclude through the symbols of Yin & Yang that there will always be conflict to counter peace & to counter war, there will always be war & that Meelo's effort will always be in vain because it will be an endless cycle. After a while he parted ways with his brother & started a ryū called Ninjutsu.