When told the news of the murder of his wife and children, he gives a moving speech stating that there is more to manhood than violence and ambition. Men must also have compassion and feel grief: "I must also feel it as a man"
His loyalty is tested by Malcolm and he passes the test: "I am not treacherous". He also repeatedly calls Macbeth a "tyrant", i.e. not a true ruler, but one who rules cruelly
Acts as a symbol of the status quo: the actions of Macduff return order to the Kingdom of Scotland and return the rightful, God-chosen king to the throne