What is the mangkwan clan s role in the avatar sequels?

The Mangkwan clan is not a recognized part of the Avatar universe, based on the available canon information for both Avatar: The Last Airbender and its sequel The Legend of Korra. No canonical sources, episode transcripts, or official materials reference a clan by that name. Consequently, any claim about their role in the sequels would be speculative and unverified. If you encounter a mention of the Mangkwan clan in fan works or unofficial content, it would not be considered part of the official storyline.