Talia

Talia is a waterbender from the North Pole. She is the adopted sister to the late princess Yue and new heir to the throne. But after the failed attack on the North Pole, Talia thought it would be best to leave behind her home to help the Avatar. Katara now partially trains her on waterbending, teaching her waterwhips, healing, and octopus form. Talia is shown to be exceptional in her bending and is able to learn at a fast pace.