Character Analysis: Macbeth
Macbeth is a tragic hero whose fatal flaw is ambition. Crucially, he considers regicide before Lady Macbeth even appears, admitting the "horrid image" of usurping Duncan makes his heart "knock at my ribs."
Initially, he retains moral awareness. He declares "I dare do all that may become a man / Who dares do more is none," showing he understands the difference between courage and evil. After murdering Duncan, he's immediately tormented by guilt, unable to say "Amen."
The key point is that Macbeth chooses evil freely. Neither the witches nor Lady Macbeth control him - they influence, but he decides. Once he starts killing, paranoia drives him to murder Banquo and Macduff's family without consulting anyone.
By Act 5, he's emotionally dead. When told of Lady Macbeth's death, he feels nothing, reflecting instead on life's meaninglessness. He's a tragic hero because he suffers for his evil rather than accepting it callously.
Tragic Hero: Remember that Macbeth's awareness of his own evil makes him tragic rather than simply villainous!