Council of Elders
- Main article: Council of Elders
The Council of Elders were the leaders of the Air Nomads. Each of the air temples had its own council of head monks or nuns, their members being both the political and the religious authorities. The Northern and Southern councils were composed of five head monks each, and the Eastern and Western councils were composed of five head sisters each.
Military of the Water Tribe
- Main article: Military of the Water Tribe
The organization has a loose structure, and the chain of command is not well-defined. There is no overall military commander of the Water Tribe, command being divided between the north and south. It is clear, however, that the chiefs of the two tribes have overall authority over their respective tribal military.
- Main article: Five-Seven-Five Society
Ba Sing Se University
- Main article: Ba Sing Se University
Ba Sing Se University is a major school of thought, serving scholars throughout the Earth Kingdom. The greatest university in the world, at least according to its enrollment materials, the campus is a major landmark in the Middle Ring of Ba Sing Se.
Council of Five
- Main article: Council of Five
The Council of Five is the highest authority in the Earth Kingdom military, and oversees the country's entire war effort against the Fire Nation. The council is headed by General How, the commanding officer of the military. Among the council members is General Sung, who defends Ba Sing Se's Outer Wall from attack.
- Main article: Dai Li
The Dai Li were the secret police of Ba Sing Se who worked to capture, interrogate, and imprison political dissidents. They were created by Avatar Kyoshi centuries before the Hundred Year War with the aim of "protecting the cultural heritage of Ba Sing Se."
- Main article: Freedom Fighters
- Main article: Kyoshi Warriors
The Kyoshi Island Warriors are an all-female group of fighters led by Suki on Kyoshi Island. Their individualities have been greater expanded since the first season. All the warriors initially looked exactly the same, but later they all sported different hairstyles and headdresses.
Military of the Earth Kingdom
- Main article: Military of the Earth Kingdom
The military of the Earth Kingdom is the organization responsible for the defense of the Earth Kingdom. It consists of an army, a navy, air force, and several special forces groups. It wields considerable power, having held off Fire Nation assaults for a century.
The earth monarch is the constitutional overall commander, although at times, the monarch's actual power has been limited. The main commanding authority is the Council of Five, comprised of five senior generals who oversee any war effort from Ba Sing Se.
- Main article: Omashu Resistance
The Omashu Resistance was a loosely-organized group of revolutionaries that fought to liberate the city of Omashu from Fire Nation rule. Created after the city was captured during the Hundred Year War, the forces were led by Yung and planned their operations underground.
Pirates are people who, along with others of equal status, are dedicated to boarding vessels at sea to steal and otherwise intervene with the activities on board. The pirate captain is the sinister leader of a band of pirates.
Royal Earthbender Guards
- Main article: Royal Earthbender Guards
The Royal Earthbender Guards of Ba Sing Se, commonly known as the King's Guards, are earthbending warriors within the Earth Kingdom and are affiliated with neither the Dai Li nor the military. They serve as personal protectors of the Earth King.
- Main article: Terra Team
Ember Island Players
- Main article: Ember Island Players
The Ember Island Players are a local acting troupe who perform at the Ember Island Theater, which is Ember Island's only theater. They do not have a reputation for quality acting, but they take themselves seriously and almost always pack the house, though this is probably because the theater is one of the only sources of night time entertainment on the island. They performed the play The Boy in the Iceberg.
Fire Nation circus
- Main article: Fire Nation circus
The Fire Nation circus is a traveling circus that performs in the Fire Nation colonies in the Earth Kingdom. It features an extremely large collection of rare and exotic animals. Ty Lee once performed as an acrobat at this circus, until she was intimidated by Azula into joining her on her mission to capture her brother. This circus also attempted to house and train Appa after acquiring him from the desert merchants.
Fire Nation school
- Main article: Fire Nation school
Located on one of the outer islands of the Fire Nation, this upper-class school molds the young minds of the Fire Nation. This school in particular is one of the better public schools of the Fire Nation. The teachers here maintain extreme order and are focused on creating the perfect Fire Nation citizen.
- Main article: Fire Sages
The Fire Sages are the religious authority of the Fire Nation, responsible for identifying the Avatar's incarnations when he is born in the Fire Nation, guarding the temple and conducting weddings, coronations and funerals for the Royal Family and to those who seek their help. When Avatar Roku died, they waited for the next Avatar, but he never came, so they served the Fire Lord instead.
Military of the Fire Nation
- Main article: Military of the Fire Nation
The military of the Fire Nation is the unified military forces of the Fire Nation. It is the most powerful military force in the world and is much more technologically advanced than any other of the four nations. It would have won the Hundred Year War without the intervention of the Avatar. The Fire Lord is the commander-in-chief of the Fire Nation military, delegating his power through a select few generals and admirals of the army and navy, respectively. The War Minister develops and provides technology and equipment for the Fire Nation military, reporting directly to the Fire Lord.
New Ozai Society
- Main article: New Ozai Society
- Main article: Rough Rhinos
The Rough Rhinos are an elite group of Fire Nation komodo rhino cavalry. They do not seem to be under the direct control of the military, but instead work on a freelance basis for the Fire Nation. There are five members of the group, each of whom specializes in a different type of weapon/fighting style. Interestingly, each of their preferred weapons are not well adapted for close-combat.
Royal Fire Academy for Girls
- Main article: Royal Fire Academy for Girls
The Royal Fire Academy for Girls is an upper class academy located in the Fire Nation. Mai, Ty Lee, and Azula attended this academy when they were young. It is an elite school, and only the Fire Lord and other rich nobles living in the capital can send their daughters to the school.
- Main article: Royal servants
Over one hundred servants work in the Fire Nation Royal Palace and tend to the Royal Family's every need. To become a royal servant is the honor of a lifetime for the servants and their families.
- Main article: The Flamey-Os
This is a young, underground Fire Nation band. The band's members are school-aged kids who dream of touring the world.
- Main article: Yuyan Archers
The Yuyan Archers were an extremely skilled group of Fire Nation archers that were mainly used as security guards, before being re-tasked by Admiral Zhao in his hunt of the Avatar. Their skill was so considerable that they were able to shoot up to four arrows at a time, and were said to be able to "pin a fly to a tree from a hundred yards away without killing it". Vachir, a member of the Rough Rhinos, was formerly a member of the Yuyan Archers.
United Republic of Nations
- Main article: Air Acolytes
Air Acolytes are monks and nuns that reside on Air Temple Island, responsible for carrying on the traditions of the Air Nomads. The first Air Acolytes were appointed by Avatar Aang himself and they consisted of the members in the Official Avatar Aang Fan Club in both Ba Sing Se and Yu Dao.
- Main article: Cabbage Corp
Cabbage Corp is the name of a company that produces automobiles. Its only known model is the Cabbage Car, a cheaper, more compact alternative to the Satomobile produced by Hiroshi Sato's Future Industries.
- Main article: Future Industries
Future Industries is the name of the company founded by Hiroshi Sato. After Hiroshi's incarceration for his part in the Anti-bending Revolution, ownership of the company passed to his daughter, Asami. Using state-of-the-art technology and the assembly line, the factory produces over a hundred luxury Satomobiles on a daily basis.
- Main article: Equalists
The Equalists were an organization directed against the art of bending, and as a direct result, benders themselves. They utilized chi blocking as a means to counteract bending and its advantages. They also used long range weapons, called bolas, to tie together and restrain the arms and legs of their enemies.
Metalbending Police Force
- Main article: Metalbending Police Force
The Metalbending Police Force is the elite law enforcement team of Republic City. After Lin Beifong left the police force, her position as police chief was taken over by Saikhan. By using metalbending to manipulate the metal cables within the cylindrical spool devices on their backs, the metalbenders are able to restrain criminals and navigate the city quickly and efficiently. They also carry equipment, such as truncheons and riot shields. The Metalbending Police Force monitors events in the city through use of several airships, and this mobility allows them to easily apprehend criminals and deploy forces for pursuit.
Republic City is separated into sections controlled by different organized crime groups. They collect "protection money" or bribes from shopkeepers to guarantee that their belongings do not get destroyed. Among these triads, the most famous would be the Triple Threat Triad, who are close rivals with the Red Monsoon Triad and the Agni Kai Triad. They often get into "turf wars" where they might battle each other for control of the city.
Tarrlok's task force
- Main article: Tarrlok's task force
- Main article: United Forces
The United Forces is the United Republic of Nations' main line of defense against the nation's enemies.
United Republic Council
- Main article: United Republic Council
The United Republic Council was the governing body of the United Republic of Nations from the time of the country's establishment to the assembly's dissolution in 171 AG. It was composed of representatives from the Earth Kingdom, Fire Nation, Air Nation, and both the Northern and Southern Water Tribes. The Chairman directed Council conventions and also acted as a spokesperson, regularly informing the public of the assembly's deliberations through news interviews.
Order of the White Lotus
- Main article: Order of the White Lotus
The Order of the White Lotus is an ancient secret society that transcends national boundaries. The Order is about philosophy, beauty and truth. They are devoted to the sharing of ancient knowledge and philosophy across national and political divides. Formed centuries prior to the Hundred Year War by the wisest scholars from all over the world, the Order began as a club where these ancient masters could challenge one another on the Pai Sho table. They derived their name from the white lotus tile used in Pai Sho, a key element in their favored strategy in the game. Iroh was a Grand Lotus of the Order.
- Main article: Red Lotus
Founded by Xai Bau, the Red Lotus is a splinter faction of the Order of the White Lotus. Their goals are to have humans and spirits coexist again and to usher in a new world order by doing away with the established nations and its leaders, which they originally planned to do by freeing Vaatu from the Tree of Time. As of 171 AG, only four members of the group are publicly known, having been incarcerated for thirteen years following a failed attempt to kidnap Avatar Korra.
- Main article: Team Avatar
Team Avatar was composed originally of Aang, Katara, Sokka, and Appa. Their mission was to save the world from the Fire Nation. They traveled from the Southern Water Tribe to the Fire Nation. They started their journey when they found Aang in an iceberg. As their journey continued, Momo became a member at the Southern Air Temple, and Toph Beifong joined the team as Aang's earthbending instructor. During the final leg of their journey, Zuko and Suki became members of the team. They were successful in completing their mission during the arrival of Sozin's Comet.
Team Avatar (Korra)
- Main article: Team Avatar (Korra)
Inspired by Aang and his friends, a new Team Avatar was formed in 170 AG by Korra, Mako, Bolin and Asami Sato as they wanted to do their part in the fight against the Equalists and restore harmony between the benders and nonbenders of Republic City. Although they drifted apart due to each having their own responsibilities in the city, they were there for each other when needed.