Asides and soliloquies are perhaps the most powerful form of expression and Shakespeare employs these techniques so the audience is able to grasp a better understanding of the state and mind of Macbeth. Macbeth is a tragic hero. It is through Shakespeare's manipulation of figurative language, dramatic conventions and social expectations of the seventeenth century, do the audience witness the demise of this mixed up man.
Unfortunately, Macbeth is an example of a character that has this title.
From conflict, chaos and death, came the reign of a new king. The tragic hero has a tremendous downfall, brought about by their hamartia. In all of these stories, characters fall prey to thinking of themselves as exceptional individuals for whom standard rules of morality do not apply.
This is the basis of his tragic hero persona.