In any narrative, a foil is a character who contrasts with another character; typically, a character who contrasts with the protagonist, in order to better highlight or differentiate certain qualities of the protagonist. 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.
A foil usually either differs dramatically or is an extreme comparison that is made to contrast a difference between two things. Thomas F. Gieryn places these uses of literary foils into three categories, which Tamara A. P. Metze explains as: those that emphasize the heightened contrast (this is different because ...), those that operate by exclusion (this is not X because...), and those that assign blame ("due to the slow decision-making procedures of government...").
The word foil comes from the old practice of backing gems with foil to make them shine more brightly.
Examples from literatureEdit
In David Copperfield, by Charles Dickens, Edward Murdstone's marriage to David's mother Clara, contrasts with David's future marriage to Dora Spenlow, presented with a different outcome if David had endeavored to subdue his wife's caprices, as did Edward Murdstone with Clara's.
Similarly, William Shakespeare's tragedy Julius Caesar, the character Brutus has foils in the two characters, Cassius and Mark Antony. In the play Romeo and Juliet, Romeo and Mercutio serve as character foils for one another, as well as Macbeth and Banquo in his play Macbeth. In the tragedy Hamlet, a foil is created between Laertes and Prince Hamlet to elaborate the differences between the two men. In Act V Scene 2, Prince Hamlet tells Laertes that he will fence with him and states, "I'll be your foil, Laertes" (5.2.272). This word play reveals the foil between Hamlet and Laertes, that was developed throughout the play.
George and Lennie are foils to each other in John Steinbeck's Of Mice and Men. Lennie is huge and strong as a bull but is also mentally slow, while on the other hand George is small, skinny and very smart.
In the Harry Potter series, Draco Malfoy can be seen as a foil to the Harry Potter character; Professor Snape enables both characters "to experience the essential adventures of self-determination" but they make different choices; Harry chooses to oppose Lord Voldemort and the Death Eaters wholeheartedly, whereas Draco struggles with his allegiances through the whole series.
In Attack on Titan, Levi Ackerman and Zeke Yeager were set up as narrative foils; Levi had his desire to protect the lives of even people he did not know personally and to find meaning in the lives of his fallen comrades established early on, while Zeke disparaged the value of life, by being relatively indifferent to the lives lost in pursuit of his euthanasia plan, and also lacked camaraderie.
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