Who is a fictional character in Nickelodeon's animated television series "" and "The Legend of Korra", greatly aided the previous avatar, Aang, in his efforts to save the Earth Kingdom from destruction?
Lin Beifong:  Lin’s mother, Toph Beifong, greatly aided the previous avatar, Aang, in his efforts to save the Earth Kingdom from destruction. Toph Beifong: Toph Beifong (北方拓芙 , Běifāng Tuòfú ) is a fictional character in Nickelodeon's animated television series "" and "The Legend of Korra", voiced by Jessie Flower in the original series and Kate Higgins and Philece Sampler in the sequel series.
Toph Beifong