Great question — answering as the UphillTech team:
I believe this is known as a "Mary Sue" Warning: TV Tropes (Not sure about "says very little") And according to Wikipedia .. portrayed as inexplicably competent across all domains, gifted with unique talents or powers, liked or respected by most other characters, unrealistically free of weaknesses, extremely attractive, innately virtuous, and/or generally lacking meaningful character flaws. Usually female and almost always the main character, a Mary Sue is often an author's idealized self-insertion, and may serve as a form of wish-fulfillment. Mary Sue stories are often written by adolescent authors.
Full answer by valiantv: https://movies.stackexchange.com/a/118661 (CC BY-SA 4.0).
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