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. A foil to the protagonist may also be the antagonist of the plot.
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.
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Lord Banquo /ˈbæŋkwoʊ/, the Thane of Lochaber, is a semi-historical character in William Shakespeare's 1606 play Macbeth. In the play, he is at first an ally of Macbeth (both are generals in the King's army) and they meet the Three Witches together. After prophesying that Macbeth will become king, the witches tell Banquo that he will not be king himself, but that his descendants will be. Later, Macbeth in his lust for power sees Banquo as a threat and has him murdered by three hired assassins; Banquo's son, Fleance, escapes. Banquo's ghost returns in a later scene, causing Macbeth to react with alarm in public during a feast.
Shakespeare borrowed the character Banquo from Holinshed's Chronicles, a history of Britain published by Raphael Holinshed in 1587. In Chronicles, Banquo is an accomplice to Macbeth in the murder of the king, rather than a loyal subject of the king who is seen as an enemy by Macbeth. Shakespeare may have changed this aspect of his character to please King James, who was thought at the time to be a descendant of the real Banquo. Critics often interpret Banquo's role in the play as being a foil to Macbeth, resisting evil whereas Macbeth embraces it. Sometimes, however, his motives are unclear, and some critics question his purity. He does nothing to accuse Macbeth of murdering the king, even though he has reason to believe Macbeth is responsible.
Prince Charming is a fairy tale stock character archetype who comes to the rescue of a damsel in distress and must engage in a quest to liberate her from an evil spell. This classification suits most heroes of a number of traditional folk tales, including "Snow White", "Sleeping Beauty", "Rapunzel", and "Cinderella" even if in the original story they were given another name, or no name at all.
Elements of the Prince Charming character date at least back to Charles Perrault's Sleeping Beauty, published in 1697. Often handsome and romantic, these characters are essentially interchangeable, serving as a foil to the heroine; in many variants, they can be viewed as a metaphor for a reward the heroine achieves for the decisions she makes. The prominence of the character type makes him an obvious and frequent target for revisionist fairy tales, usually portraying him as narcissistic, dimwitted, and solely focused on romance, and often as a foil to either the heroine or their true love interest. "Prince Charming" is also used as a term to refer to the idealized man some people dream of as a future spouse.