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 must deal with growing 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 "question is" and speculation debates.'

These storyline elements remain unconfirmed. Some of it could possibly be revealed at Comic-Con 2010.
 * Aang may 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. 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, being that there weren't any Waterbenders left in the Southern Water Tribe after Katara left.
 * It is also possible that she could be Aang and Katara's granddaughter. Though this seems unlikely as Tenzin is the only child Aang and Katara are revealed as having had and Korra has to go looking for him in the series.
 * 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 (chronically 163-166 years) if he stayed 12 throughout the whole series.