Korra

"water"

- ...a passionate, rebellious, and fearless teenaged girl from the Southern Water Tribe...

Avatar Korra is the main character in Avatar: Legend of Korra, and the successor to Aang as the Avatar. She is a teenager born to the Southern Water Tribe. At the start of Legend of Korra, she has already mastered Waterbending, Earthbending, and Firebending, and only needs to learn Airbending and control of the Avatar State to become a fully realized Avatar. Seventy years after the end of The War, Korra journeys to Republic City seeking the tutelage of Tenzin, the son of Aang and Katara and an airbending master. During her training, she and some anti-bending unrest in the city. Not much else is known about her.

Rumors & Speculation
'Note: PLEASE note that the below "confirmations" delivered to you by many Avatar fansites are NOT confirmed as of yet. DO NOT take most of the information here as a fact. Also, DO NOT edit things interpreted as "fact" into this article. Furthermore, do not add in "questions"' and speculation debates.

The story has been confirmed. Has been revealed at Comic-Con 2010.
 * Aang will mentor her from the spirit world, just as Roku mentored Aang.
 * As she is from the Southern Water Tribe, it is possible that she could be Sokka and Suki's granddaughter. If she is Sokka and Suki's granddaughter that would make Tenzin either her mothers or fathers cousin, so the already shipped "Korzin" (Korra and Tenzin) would not apply. It also might not apply since Tenzin could possibly be in his 30's or 40's, where as Korra is somewhere in her late Teens.
 * It could also be possible that she was born from a native Northern Water Tribe male or female that was either a Waterbender or carried the gene, but was raised in the Southern Water Tribe, being that there weren't any Waterbenders left in the Southern Water Tribe after Katara left, and some were recruited to accompany Master Pakku on his journey to the Southern Water Tribe to rebuild it.
 * Korra is likely between 16 and 19 years old judging from the picture and the tradition of revealing the Avatar at the age of 16. This would mean Aang died somewhere in between 151-154 ASC and only lived to be biologically 64-67 years (chronically 164-167 years) if he were 13 when the series ended, or 63-66 years (chronologically 163-166 years) if he stayed 12 throughout the whole series.

Trivia

 * Korra is a word of Greek and Irish origin meaning, "from the mountain valley". It also means "maiden" in Greek, and "grass" in Aboriginal (Native Australian) language.
 * 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 Southern and Northern tribes, where often people include one or two "K"s and have an "UH" sound in their name. (Katara, Hakoda, Sokka, Pakku, Kya, Kuruk, Kanna, Arnook, etc.)
 * If you zoom into the picture of Korra you can make out a green-ish earring on her right ear. But her character is still in development so that may change.