Throughout Othello, Iago deceives everyone. Many have argued that, most fundamentally, he deceives himself into believing that his motives justify his actions.

Because the others believe him, he does provoke some men to resent the successful characters, including Othello. He also incites jealousy, which may be more central to the action as that is what motivates Othello to murder his blameless wife.

The use of "impostor" here is unclear. He does not pretend to be another person. It would be helpful to clarify the meaning. He is a fraud, a dissembler, and basically a liar.

In terms of the characters included, it would make the thesis more broadly applicable to include at least one female character. Iago manipulates Emilia as well, which figures into the plot through the handkerchief, a central symbol of deception.