What light is shed on Macbeth through his interactions with the witches, Banquo and Macduff?

Macbeth is a play which, through the protagonist¡¦s interaction with a variety of dissimilar characters, explores the deterioration and disintegration of a tragic hero. Macbeth is introduced in the play as a hero. He is a brave warrior in the battlefield and wins his respects among the others and is made a ¡¥worthy thane¡¦ by King Duncan. But after hearing the prophecies from the witches, Macbeth is confused. After Lady Macbeth successfully persuades her husband to commit the murder of Duncan, Macbeth seems to be most human and sympathetic. However by Act 3 Scene 2, Macbeth presents himself as an evil villain. In this Act, Macbeth¡¦s speech is dark. Straight after Banquo was killed, Macbeth pulls himself into other terrible deeds; he tries to challenge the witches and to disregard their prophecies. The murder of Macduff¡¦s family reduces Macbeth¡¦s human characteristics even more. Macbeth ¡§wades¡¨ through the ¡§river of blood¡¨ and can not stop himself from d...