Katara

Katara is a waterbending master, born in the Southern Water Tribe to Chief Hakoda and his wife Kya. During her childhood, she was the only waterbender living in the Southern Water Tribe. After losing her mother in a Fire Nation raid and her father left to battle against the Fire Nation in the Hundred Year War, she was raised by her paternal grandmother Kanna alongside her older brother Sokka. As a teenager, Katara and her brother discovered the young Air Nomad Avatar, Aang, who had been frozen in an iceberg with his bison, Appa, for a century. In need of a waterbending master, the siblings and Aang left the South Pole on a journey toward the Northern Water Tribe. Realizing Aang was the Avatar, Katara and Sokka continued to travel with him across the world as he mastered the remaining elements, earth and fire. She became Aang's waterbending instructor after their departure from the Northern Water Tribe, replacing Master Pakku, who had instructed them during their time there. Her mastery of water made her a formidable asset to the group. The siblings' assistance helped Aang halt the Fire Nation's ambitions of world domination, ending the century-long war, and finally restoring balance to the world