Hakoda is an existing character from Avatar: The Last Airbender. See Hakoda's article on the Avatar Wiki for more information.
Hakoda is Sokka's and Katara's father, and grandfather to Hayoda (who is named for him), Yue, Yi Lin, and Tseng. He still is Chief of the Southern Water Tribe, and though elderly, spends his days working to rebuild the once-great cities of the South Pole, pushed to the brink of extinction during the War.