Korra is the Avatar immediately succeeding Aang and the main protagonist of the series. She is a talented bender, eager to learn. Hotheaded and rebellious, Korra relishes her role as "The Chosen One".
Mako is a firebender who grew up on the streets of Republic City with his younger brother Bolin, who introduces him to Korra. Tall, lean, and handsome, he was a skilled participant in pro-bending and the former captain of the Fire Ferrets pro-bending team, before becoming a police officer.
Bolin is an earthbender who, along with his brother Mako, becomes friends with Korra. He shares a deep bond with his brother and keeps a fire ferret named Pabu. Bolin is enthusiastic and optimistic and, as a pro-bender, enjoys all the attention he receives from his female fans. After the exclusion of his team from the tournament, he becomes an actor.
Asami Sato is the daughter of Hiroshi Sato. She has lived a life of luxury, but despite her fancy clothes and polite manners, she has a tough side. She is an expert driver and has had extensive self-defense training. Asami is a "big fan" of pro-bending, and after her father's incarceration, she takes over his company.
Tenzin is the youngest son of Aang and Katara and an airbending master. A calm and serious man, he carries a great burden to protect not only Korra, but also Republic City. Tenzin resides on Air Temple Island with his wife, Pema, and his four children, Jinora, Ikki, Meelo, and Rohan.
Lin Beifong leads the Metalbending Police Force of Republic City and is the daughter of Toph Beifong. She is tough and uncompromising, believing that the only way to maintain peace and stability in the city is through the use of military might.
Amon is the main antagonist of the first book of the series. He is the charismatic and mysterious leader of the Equalists, whose ultimate goal is to create equality through an anti-bending revolution. He wears a mask to conceal his face. A nimble and stealthy fighter, Amon is fearless in facing his opponents, regardless of their bending skills, and also forms a great danger for the benders, being able to take their bending away.
Tarrlok is the secondary antagonist of the first book of the series. He is the representative for the Northern Water Tribe on the United Republic Council and also serves as its chairman. Tarrlok seeks to fight the Anti-bending Revolution with violence rather than peaceful negotiation and is willing to go to extreme lengths to win the conflict against the Equalists, even if it means fanning the flames of aggression and risking the lives of innocent people.
Unalaq is the main antagonist of the second book of the series. He is Korra's paternal uncle and current chief of both the Northern and Southern Water Tribes. As a particularly spiritual man, he possesses an extremely strong connection with the Spirit World. He is a firm believer in the old ways of the Water Tribe and a true fundamentalist as far as honoring the spirits is concerned.
Varrick is the secondary antagonist of the second book of the series. He is an eccentric captain of industry from the Southern Water Tribe. He spends most of his time traveling around the world on his yacht. He reappears in the following books, where his inventions help to change the world.
Zaheer is the main antagonist of the third book of the series. He is a fugitive who gained airbending due to Harmonic Convergence and, along with his three comrades, seeks to end the Order of the White Lotus and the Avatar herself.
Ghazan is an earthbending criminal and ally of Zaheer. He is able to phase-change earth and bend it into lava.
Ming-Hua is an armless waterbender who uses water as a substitute for her missing limbs. She is also a criminal and part of Zaheer's group.
P'Li is also a criminal and a firebender who can create explosions with her mind. She is Zaheer's girlfriend.
Hou-Ting is the secondary antagonist of the third book of the series. She is the tyrannical Queen of the Earth Kingdom who will do anything and everything in her power to attain what she wants, whether it is extorting money from her subjects or manipulating others into doing her work for her.
Kai is an orphan from the Earth Kingdom who acquired airbending abilities as a result of Harmonic Convergence. He has joined Team Avatar in their search for new airbenders. He is Jinora's love interest.
Suyin Beifong is the daughter of Toph Beifong and the creator of the metal city Zaofu. Though she has a somewhat troubled past and a strained relationship with her older half-sister Lin, Suyin is happily married with five children.
Kuvira is the main antagonist of the fourth and final book of the series. Introduced as a minor character in Book Three, she is a metalbender and was the captain of Zaofu's city guard before being appointed Interim President of the Earth Kingdom, forming her own army to reunite and stabilize the nation after the death of Earth Queen Hou-Ting. She would usurp the monarchy and declare the Earth Empire in its place.
Baatar Jr. is Suyin's eldest son and the fiancée of Kuvira. He is an inventor who uses his ideas to help aid Kuvira and her cause.
Wu is a great-nephew of Earth Queen Hou-Ting and her successor to the throne. He has been living in Republic City due to the anarchy in the Earth Kingdom, awaiting his opportunity to return safely and take the throne.
is the former Chief of Police of Republic City and the creator of metalbending
. She is also a former member of the original Team Avatar and the mother of Lin and Suyin. After her early retirement from the police force, she set off to travel the world in search for enlightenment and settled down in a swamp.