What, can the devil speak true? A foil is a character that takes the same path as the main character but makes a different decision. Banquo is a perfect foil to MacBeth. 'Banquo and Macbeth, all hail' Banquo was with MacBeth when he met the witches, the witches could have chosen Banquo instead of MacBeth. Also Banquo tells MacBeth that he is doomed if he trusts the witches, this is when Banquo makes a different decision than Macbeth and be comes a foil. Banquo was in the same situations as Macbeth, and if it weren't for the witches deciding to mess with MacBeth's head instead, Banquo would be doing the same thing as MacBeth