No. His conniving had small benefit to him. It is true that he was able to replace Cassio as Othello's lieutenant, but almost immediately thereafter he did his level best to bring Othello (and thus his newly won position) down. There was no benefit to Iago in doing so.
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no Iago is. Iago is the planner and causes the conspiracy of the play. iago tricks Othello and rodrigo
Neither. Othello was the captain, Cassio the lieutenant and Iago the ensign.
Iago is, although he is more likely to get others to do bad things than to do them himself. He does murder Roderigo, after egging him on to kill Cassio. He also induces Othello to murder Desdemona.The villain in Othello is Iago as he twists Othello's mind and gets him to kill Desdemona, steals from Roderigo and kills him, kills Emilia, wounds Cassio and ruins his job.
Othello promoted Cassio as his lieutenant instead of Iago.
Iago is usually pictured in Army Uniform. So is Othello, usually.