Big things are happening on TV Tropes! New admins, new designs, fewer ads, mobile versions, beta testing opportunities, thematic discovery engine, fun trope tools and toys, and much more - Learn how to help here and discuss here.
Recap: Avatar: The Last Airbender "The Painted Lady"
"I will never, ever turn my back on people who need me!"
When the Gaang comes upon a fishing village that has been having hard times due to the pollution from a local factory, Katara cannot resist helping the villagers in the guise of the local river spirit, the Painted Lady.
An Aesop: "You can't wait around for someone to help you. You have to help yourself."
Chronic Hero Syndrome: Katara. The page quote is basically the defining statement of her personality. (It's even her quote on her character sheet listing).
Ungrateful Bastard/ What the Hell, Townspeople?: Subverted, for once. The villagers are plenty mad that the local girl is a waterbender and has been masquerading as their patron goddess, until Sokka calls them out on it and points out that now the village is safe and can grow prosperous again.