^Are you serious? She's incredibly boring and her motivations for being that way are weak as hell.
Oh... my mother and father told me to behave. That I should be a good, quiet girl... Worst backstory of the Firebending crew, and her romance with Zuko feels awkward and forced. Ty Lee's motivations weren't great either, but compared to Mai's they're like a well-constructed novella. Plus Ty Lee is actually interesting.
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