Banquo and Macduff: Loyalty and Revenge
Banquo serves as Macbeth's moral opposite – both hear the witches' prophecies, but only Macbeth acts on them. As a loyal friend who becomes suspicious of Macbeth's rapid rise to power, Banquo represents the path Macbeth could have taken. His ghost haunting Macbeth symbolises guilty conscience and the supernatural consequences of evil actions.
Macduff embodies loyalty to rightful authority and becomes Macbeth's nemesis. His discovery of Duncan's body ("O horror, horror, horror!") shows genuine grief, contrasting with Macbeth's fake reactions. When Macbeth murders Macduff's family, the play's themes of justice and revenge intensify dramatically.
Macduff's emotional response to his family's murder ("All my pretty chickens and their dam at one fell swoop!") reveals his humanity and justifies his quest for vengeance. Being "not of woman born" (born by caesarean section), he fulfils the witches' prophecy by killing Macbeth, representing justice triumphing over tyranny.
Key Insight: Banquo and Macduff represent different types of loyalty – Banquo to friendship and morality, Macduff to rightful kingship and family honour.