In fiction, a foil is a character who contrasts with another character (usually the antagonist) in order to highlight particular qualities of the other character.[1][2]
A foil's complementary role may be emphasized by physical characteristics. A foil usually differs drastically. For example in Cervantes' Don Quixote, the dreamy and impractical Quixote is thin in contrast to his companion, the realistic and practical Sancho Panza, who is fat. Another popular fictional character, Sherlock Holmes, is tall and lean; his right-hand man Doctor Watson, meanwhile, is often described as "middle-sized, strongly built." The "straight man" in a comedy duo is a comic foil. While the straight man portrays a reasonable and serious character, the other portrays a funny, dumb, or simply unorthodox one.
Laertes and Fortinbras in Shakespeare's play Hamlet are also examples of character foils- all faced with the dilemma of how/whether to achieve revenge for the murder of their fathers, Laertes and Fortinbras serve to highlight Hamlet's morality.
In some cases, a subplot can be used as a foil to the main plot. This is especially true in the case of metafiction and the "story within a story" motif.[3]
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