There are many. In 'Macbeth', Macduff can be considered a foil to Macbeth. Macduff is loyal and has a strong sense of right and wrong, while Macbeth succumbs to his ambition and becomes a tyrant. Additionally, in 'Jane Eyre', Blanche Ingram is a foil to Jane. Blanche is vain and materialistic, while Jane is plain - looking but has a rich inner world and strong moral fiber.
One well - known example is 'Romeo and Juliet'. Tybalt can be seen as a foil to Romeo. Tybalt is hot - headed and quick to anger, always ready for a fight, while Romeo is more of a dreamer, in love with the idea of love. Also, in 'To Kill a Mockingbird', Bob Ewell is a foil to Atticus Finch. Bob is ignorant and malicious, whereas Atticus is intelligent and morally upright.