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Mary Sue
(originally in fan fiction) a type of female character who is depicted as unrealistically lacking in flaws or weaknesses.
A Mary Sue is a type of fictional character, usually a young woman, who is portrayed as unrealistically free of weaknesses. Originating in fan fiction, a Mary Sue is often an author's idealized self-insertion. Mary Sue stories are often written by adolescent authors.
-wikipedia
I've seen it before, but I'm not actually sure what it is; originally, I thought it was some type of color, but maybe not?