The major themes present in Othello are Jealously, Betrayal and Appearance vs. Reality. Each one of these themes are reinforced throughout the play in Iago's evil plot. They are represented or seen by Othello, Iago and Cassio and the relationship between them; dictating the motion of the play.
Othello is the main character of the play. He is a moorish general and head of the army of venice. He is a warrior, honest, and loves his new wife Desdemona very much. His only mistake is trusting his ensign, Iago too much and allowing Iago to come between his marriage. Iago makes Othello believe that his wife, Desdemona, is cheating on him.
Iago is Othello's ensign, and the main villain of the play. He hoped to be promoted to the position of lieutament, but Othello chose Cassio over him. To get revenge, he brings forth a plot to convince Othello that Cassio and Desdemona, are having an affair. Iago is truly evil, and cares o...
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...is an evil person. His envy towards Othello drives him on deceiving him and Cassio into believing his supposed loyalty. Iago betrays him by plotting against him using Cassio who is manipulated and innocent of his evilness. Cassio's only interest is getting the position as Othello's lieutanent and by this he gets used by Iago, who disliked him from the beginning because that was the position he wanted to receive. By bringing Cassio in, we close the triangle understanding how the relationship between them dictate the motion of the play.