Who might use a foil Catcher in the Rye?

A foil is a character who contrasts with another character in order to highlight particular qualities or traits. In "Catcher in the Rye," characters like Stradlater or Mr. Antolini can be seen as foils to Holden Caulfield, as they emphasize different aspects of his personality or beliefs. These foils can help deepen our understanding of Holden and his thoughts and actions.