Final answer:
Iago is most famously referred to as a villain or manipulator in Shakespeare's play, Othello. He is an intelligent antagonist known for his evil schemes. Augusto Boal also likened Iago to 'the Joker', which symbolizes a cunning and deceptive character.
Step-by-step explanation:
Iago is most commonly referred to as a villain, manipulator, or the embodiment of evil. He is a central character in William Shakespeare's play, Othello. Iago is portrayed as an intelligent and malicious antagonist who schemes against the protagonist, Othello. The terms 'villain' and 'manipulator' are particularly apt as they describe his role in the play's central conflict. Augusto Boal, a renowned theatre practitioner, likened Iago to 'the Joker', drawing parallels to the concept of a cunning trickster or fool.
Meanwhile, the reference to Zeus and the policy of serving the Commons comes from a different piece of literature entirely, specifically from Sophocles' ancient Greek tragedy, Antigone. This excerpt speaks to themes of loyalty, justice, and the interests of the state versus individual values. While it does connect to the idea of public versus private interests, it is not directly related to the character of Iago.