Macbeth – Lady Macbeth's husband and a Scottish nobleman, the Thane of Glamis. He is made Thane of Cawdor for his bravery in battle, and becomes King of Scotland by murdering the previous King, Duncan. As Macbeth opens, Macbeth is one of the great noblemen in Scotland: valiant, loyal, and honorable. He's also ambitious, and while this ambition helps to make him the great lord he is, once he hears the weird sisters' prophecy Macbeth becomes so consumed by his desire for power that he becomes a tyrannical and violent monster who ultimately destroys himself. What's perhaps most interesting about Macbeth is that he senses the murder will lead to his own destruction even before he murders Duncan, yet his ambition is so great that he still goes through with it.
Lady Macbeth – Macbeth's wife. Unlike her husband, she has no reservations about murderingDuncan in order to make Macbeth King of Scotland. She believes that a true man takes what he wants, and whenever Macbeth objects to murdering Duncan on moral grounds, she questions his courage. Lady Macbeth assumes that she'll be able to murder Duncan and then quickly forget it once she's Queen of Scotland. But she discovers that guilt is not so easily avoided, and falls into madness and despair.
Banquo – A Scottish nobleman, general, and friend of Macbeth. He is also the father of Fleance. The weird sisters prophesies that while Banquo will never be King of Scotland, his descendants will one day sit on the throne. Banquo is as ambitious as Macbeth, but unlike Macbeth he resists putting his selfish ambition above his honor or the good of Scotland. Because he both knows the prophecy and is honorable, Banquo is both a threat to Macbeth and a living example of the noble path that Macbeth chose not to take. After Macbeth has Banquo murdered he is haunted by Banquo's ghost, which symbolizes Macbeth's terrible guilt at what he has become.
Macduff – A Scottish nobleman, and the Thane of…