The character that is the most responsible for the tragedy of Macbeth is Lady Macbeth because she manipulated him and made him feel like a coward; therefore, I believe Lady Macbeth pressured Macbeth so she would achieve Kingship.
Act 1 Scene 7- "That made you break this enterprise to me? When you durst do it then you were a man. And to be more than what you were, you would be so much more the man."
Reasoning- Lady Macbeth made Macbeth feel less of a man.
Underestimating Macbeth made him go through with the murder
Lady Macbeth made Macbeth feel like a coward, and is the reason he is so crazy in the head; She manipulated him by her love and affection to persuade him to do evil things which only made him more powerful than Lady Macbeth in the end.
Lady Macbeth controlled Macbeth.
But in the end his love for her still existed, controlling all he would do.