SparkNotes

Macbeth
A Scottish general and the thane of Glamis. (“Thane” is a Scottish title of nobility, and Glamis is a village in eastern Scotland.) Macbeth is led to wicked thoughts by the prophecies of three witches, especially after their prophecy that he will be made thane of Cawdor comes true. Macbeth is a brave soldier and a powerful man, but he is not virtuous. He is easily tempted into murder to fulfill his ambitions to the throne, and once he commits his first crime and is crowned king of Scotland, he embarks on further atrocities with increasing ease. Macbeth cannot maintain his power because his increasingly brutal actions make him hated as a tyrant. Unlike Shakespeare’s other great villains, such as Iago in Othello and Richard III in Richard III, who revel in their villainy, Macbeth is never comfortable in his role as a criminal. He shows at the beginning of the play that he knows right from wrong, and chooses to do wrong without being able to justify it to himself. Ultimately, he is unable to bear the psychic consequences of his atrocities.

Lady Macbeth
Macbeth’s wife, a deeply ambitious woman who lusts for power and position. Early in the play she seems to be the stronger and more ruthless of the two, as she urges her husband to kill Duncan and seize the crown. After the bloodshed begins, however, Lady Macbeth falls victim to guilt and madness to an even greater degree than her husband. Her conscience affects her to such an extent that she eventually commits suicide. At the beginning of the play, Macbeth and Lady Macbeth apparently feel quite passionately for one another, and Lady Macbeth exploits her sexual hold over Macbeth as a means to persuade him to commit murder. However, their shared alienation from the world, occasioned by their partnership in crime, does not bring them closer together, but instead seems to numb their feelings for one another.

The Three Witches
Three mysterious hags who plot mischief against Macbeth using charms, spells, and prophecies. Their predictions prompt him to murder Duncan, to order the deaths of Banquo and his son, and to blindly believe in his own immortality. The play leaves the witches' true nature unclear we don’t really know whether they make their own prophecies come true, or where they get their knowledge from. In some ways they resemble the mythological Fates, who impersonally wove the threads of human destiny. They clearly take a perverse delight in using their knowledge of the future to toy with and destroy human beings.

Banquo
The brave, noble general whose children, according to the witches' prophecy, will inherit the Scottish throne. Like Macbeth, Banquo thinks ambitious thoughts, but he does not translate those thoughts into action. In a sense, Banquo’s character stands as a rebuke to Macbeth, since he represents the path Macbeth chose not to take: a path in which ambition need not lead to betrayal and murder. Appropriately, then, it is Banquo’s ghost and not Duncan’s that haunts Macbeth. In addition to embodying Macbeth’s guilt for killing Banquo, the ghost also reminds Macbeth that he did not emulate Banquo’s reaction to the witches' prophecy.

King Duncan
The good king of Scotland whom Macbeth, ambitious for the crown, murders. Duncan is the model of a virtuous, benevolent ruler. His death symbolizes the destruction of an order in Scotland that can be restored only when Duncan’s line, in the person of Malcolm, once more occupies the throne.

Macduff
A Scottish nobleman hostile to Macbeth’s kingship from the start. He eventually becomes a leader of the crusade to unseat Macbeth. The crusade’s mission is to place the rightful king, Malcolm, on the throne, but Macduff also desires vengeance for Macbeth’s murder of Macduff’s wife and young son.

Malcolm
The son of Duncan, whose restoration to the throne signals Scotland’s return to order following Macbeth’s reign of terror. Malcolm becomes a serious challenge to Macbeth with Macduff’s aid (and the support of England). Prior to this, he appears weak and uncertain of his own power, as when he and Donalbain flee Scotland after their father’s murder.

Hecate
The goddess of witchcraft, who helps the three witches work their mischief on Macbeth.

Fleance
Banquo’s son, who survives Macbeth’s attempt to murder him. At the end of the play, Fleance’s whereabouts are unknown. Presumably, he may come to rule Scotland, fulfilling the witches' prophecy that Banquo’s sons will sit on the Scottish throne.

Lennox
A Scottish nobleman.

Ross
A Scottish nobleman.

The Murderers
A group of ruffians conscripted by Macbeth to murder Banquo, Fleance (whom they fail to kill), and Macduff’s wife and children.

Porter
The drunken doorman of Macbeth’s castle.

Lady Macduff
Macduff’s wife. The scene in her castle provides our only glimpse of family life other than that of Macbeth and Lady Macbeth. She and her home serve as contrasts to Lady Macbeth and the hellish world of Inverness.

Donalbain
Duncan’s son and Malcolm’s younger brother.