Four: First RODERIGO Second DESDEMONA Third EMILIA Fourth OTHELLO However it is implied that Brabantio has also died during the story and we know that Iago will die in the near future after a drawn out punishment.
Emilia, Iago's wife. She is an interesting character. She receives no respect from Iago, but she trusts him. She is much more realistic than the lady she serves, Desdemona, but she is also devoted to Desdemona, and dies--at Iago's hand--defending Desdemona's honor.
Iago says most of the asides, which are sections of dialogue in which the character speaking is addressing the audience, himself, or no one in particular. These serve several purposes - in Othello, they provide exposition (as the plot is rather complicated, the audience is well served to have Iago's plans and intentions explained as he goes along) and dramatic irony (as the audience knows the real story, but the characters do not.)
He says that Othello's behavior is normally much worse than that.
'If thou be'st the devil, I cannot kill thee' - Othello, Act V
Also the themes of status, power, and deception are prominent. Cassio loses his position as lieutenant, which Iago then gains. All are trying to establish power of some kind at varying points in the play. Iago wants the power that status affords him, as well as the manipulative power over his fellow man and their emotions:-
'But I will drive the Moor into a jealousy so strong / That judgment cannot cure'
This he achieves, as well as, to some extent, winning over the audience by making them laugh, singing songs and being a fun character, before revealing his true demonic self. This is the biggest shock to the audience, that while we may have regarded Othello as foolish to trust Iago, we as the audience did at one point too.
Othello wants power over his own destiny towards the end of the play, which is why he kills himself (only one of the theories).
In short, there are so many important themes in Othello, showing the most intimate details of the fragile human psyche, that it gives a very clear picture of the flaws in human nature.
Incidentally, Othello's wife is Desdemona, not Ophelia, who is in Hamlet
The full title of the Shakespeare play often called "Othello" is "The Tragedy of Othello, the Moor of Venice."
There are operas and other musical pieces based on the story and in some of these the name is spelled "Otello."
One of the senators pointed out that the Turks are more likely to want Cyprus, the Duke then decides that the Turks will attack Cyprus and that any move toward Rhodes is a trick so he sends for Othello to go to Cyprus, to defend it and become the new governor.
Iago tells Othello to beware of jealousy, the "green-eyed monster which doth mock/ The meat it feeds on" (III.iii.170-171). Likewise, Emilia describes jealousy as dangerously and uncannily self-generating, a "monster / Begot upon itself, born on itself" (III.iv.156-157). Imagery of hell and damnation also recurs throughout Othello, especially toward the end of the play, when Othello becomes preoccupied with the religious and moral judgment of Desdemona and himself. After he has learned the truth about Iago, Othello calls Iago a devil and a demon several times in Act V, scene ii. Othello's earlier allusion to "some monster in [his] thought" ironically refers to Iago (III.iii.111). Likewise, his vision of Desdemona's betrayal is "monstrous, monstrous!" (III.iii.431). Shortly before he kills himself, Othello wishes for eternal spiritual and physical torture in hell, crying out, "Whip me, ye devils, / . . . / . . . roast me in sulphur, / Wash me in steep-down gulfs of liquid fire!" (V.ii.284-287). The imagery of the monstrous and diabolical takes over where the imagery of animals can go no further, presenting the jealousy-crazed characters not simply as brutish, but as grotesque, deformed, and demonic.