Korra

Avatar Korra, from the Southern Water Tribe, is the Avatar immediately succeeding Aang. She is a teenage girl who is hotheaded and rebellious. Being the manifestation of the world in human form, Korra is the only living person who can use all four bending disciplines.

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Korra was born in the Southern Water Tribe some time after the death of Aang. Much is unknown about her early life. However, it can be assumed that Korra learned she was the Avatar and began to train in order to become a fully realized one. Having already mastered Waterbending, Earthbending and Firebending, Korra only needs to learn and master the art of Airbending and gain full control over the Avatar State in order to become a Fully Realized Avatar. About 70 years after the end of The War, Korra journeyed to Republic City seeking the tutelage of Tenzin, the son of Aang and Katara, as her Airbending master. During her travels, she discovered anti-bending unrest in the city.

Personality
Korra is fiery and pugnacious. Her personality in many ways is the opposite of Aang, her predecessor. Whereas Aang was a peaceful, nomadic Airbender, she is tough, headstrong, and combative. However, Korra also has a good sense of humour, with teenage charm and vulnerability.

Trivia

 * Korra is a word of Greek and Irish origin meaning, "from the mountain valley." It also means "crust" in Greek, and "grass" in certain Aboriginal (Native Australian) dialects.
 * Korra is pronounced the same as the Irish word "cora" which translates as "weir."
 * Korra is also the name of a village in the Tibet Autonomous Region of China.
 * Her name follows a long line of tradition in the polar Water Tribes, where often people include one or two "K"s and have an "UH" sound in their name (Katara, Hakoda, Sokka, Pakku, Kuruk, Kanna, Arnook, etc.)
 * Korra's situation appears to be the opposite of that of Aang; Aang had mastered Airbending and had to travel the world to learn the other three elements. Korra has mastered Waterbending, Earthbending and Firebending, and has yet to learn Airbending.