Avatar: Legend of Korra

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Plot Summary:
After the conclusion of the Hundred Year War, Aang and Zuko brought people from the four nations together and founded the United Republic of Nations, with its capital being Republic City, a large "metropolis powered by steampunk-type technology" such as cars and motorcycles. Aang and Katara had three children, the youngest of which was Tenzin, the only airbender of the three siblings. Meanwhile, Toph Beifong traveled extensively to teach metalbending. After Aang's death, the next Avatar, Korra, was born in the Southern Water Tribe.
Republic City is not what Korra imagined it to be. Anti-benders called "Equalists", who oppose the arts of bending, utilize techniques such as chi blocking to further their goals of revolution, led by Amon. Korra must fight rampant crime and the anti-bender revolt, assisted by two brothers, Mako, a firebender, and Bolin, an earthbender. She is also joined by her animal guide, Naga, and the metalbending police force of Republic City, who are led by Toph's daughter, Lin Beifong.
Status: Ongoing Anime Series