Sokka and Katara's relationship in Avatar: The Last Airbender is key to Aang's success, but there's one shared tragedy that is the basis of their strength. The two siblings are the first characters introduced in Nickelodeon's Avatar: The Last Airbender, with much of the action taking place in the Southern Water Tribe, where Sokka and Katara hail from. Beyond the divisions of the four nations in the world of The Last Airbender, the Water Tribes have more divisions between their own peoples, with most waterbenders hailing from either the Northern or Southern Water Tribes, while there's a small minority from the Foggy Swamp Tribe.
While the Water Tribes have some differences between them, they share most of the same customs and beliefs, such as their high ideals of family and hospitality. Nonetheless, there are some incidents of tension between the tribes, most noticeably the attempt of Avatar Korra's uncle Unalaq to seize the Southern Water Tribe in Legend of Korra. Despite this, Sokka and Katara's visit to the Northern Water Tribe in The Last Airbender generally displays the mutual respect of the two tribes, who consider themselves kin.
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F.C. Yee's novel The Dawn of Yangchen, which chronicles the Air Nomad Avatar before Aang, hints at one Water Tribe custom that is mostly absent in The Last Airbender. Upon meeting each other, two waterbenders, named Kavik and Tayagum, introduce themselves in a specific manner: "Tayagum. Of the Orca Islands, after my cousin. My parents are Angtan and Taganak." Since Kavik identically reciprocates the introduction, it's safe to assume that this is the standard protocol between waterbenders, wherever they're born. There is no
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