Iago's Personality

Iago is a soldier who has fought beside Othello for several years, and has become his trusted advisor. He speaks very differently towards different people; for example when talking to Roderigo he presents hatred towards Othello, whereas when he is beside Othello, threatens Roderigo by raising his sword.
Sly and cunning Iago uses language as his weapon by turning people against each other with a mere sentence. He deviously becomes Othello’s trusted servant, whereas in reality the audience know he has multi personalities; which is called dramatic irony.
Act 1, Scene 1, starts off with conflict between Iago and Roderigo, however in a matter of pages we see that Roderigo has warmed to Iago. Clever techniques of speech has been used by Iago to