Pakku

Pakku was a Northern-style waterbending master and instructor who possessed immense skill and power, and was once regarded as the best waterbender in the world. Dryly sarcastic and very serious about his art, he was a harsh, but nonetheless effective teacher, as well as an outwardly acerbic yet inwardly caring old man. Adhering to the Northern Water Tribe traditions, he exclusively taught waterbending to male students; however, after meeting Katara, his ex-fiancée's granddaughter, he agreed to be her waterbending master when he realized how his stubborn beliefs were what what drove the woman he loved away. After reuniting with and marrying Kanna, Pakku opened a school in the Southern Water Tribe, accepting both male and female students. Due to his great waterbending skills and wisdom, Pakku was also a member of the Order of the White Lotus, taking part in the liberation of Ba Sing Se.