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The trope is named for The Simpsons character Ned Flanders, who was originally depicted as a friendly, generous Christian neighbor and a model father, husband and citizen, making him a contrast to Homer Simpson.
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Sitcoms and sitcom characters are particularly susceptible to this, as are peripheral characters in shows with long runs. Most always, the trait/action becomes completely outlandish and it becomes their defining characteristic, turning them into a caricature of their former selves. The act of taking a single (often minor) action or trait of a character within a work and exaggerating it more and more over time until it completely consumes the character. Professor Lawrence Pierce, The Simpsons, "The Simpsons 138th Episode Spectacular"
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