There is no doubt that Iago is the most manipulative person in this drama, Othello. He even said so himself; "I am not what I am" (1.1.71) Iago only causes chaos and pain throughout the drama, and finds everyone’s weaknesses only to use it against them as seen through Cassio, Roderigo, and Othello.
Cassio, a respectable young man who is chosen as Othello's lieutenant at the start of the story, is greatly envied by Iago for his position. After the battle against the Turks, Iago thinks of a brilliant plan to ruin Othello. In order to accomplish this, he wants to destroy the image of Othello's most trustworthy man, Cassio. This way, Iago feels like he will not only be one step closer to ruining Othello, but another step closer to serving as a replacement as Othello’s lieutenant. “Not tonight, good Iago. I have very poor and unhappy brains for drinking. I could well wish courtesy would invent some other custom of entertainment.” (2.3.34-37) Here, we find out that Cassio’s weakness is alcohol. Iago definitely uses this to his advantage by giving Cassio more and more alcohol to the point where he would do something to risk his lieutenancy. "If I can fasten but one cup upon him, with that which he hath drunk tonight, already, he'll be as full of quarrel and offence as my young mistress' dog. Now my sick fool Roderigo" (2.3.49-53) He is saying how if he can force him to another drink, he'll be as drunk as he needs him to be to make a scene. Iago knows that Cassio enjoys the pleasure of alcohol, so he persuades him into having another drink. Cassio eventually gives in after Iago convinces him that the occasion is necessary since they've defeated the Turks in battle. The following quote addresses that.
Roderigo is a Venetian gentleman that is in love with the wife of Othello, Desdemona. He is willing to do whatever it takes to win her over from the Moor, and Iago automatically notices this....
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