Othello: antagonist vs. protagonist

In Othello, Othello stands out as the protagonist. He is the so called "hero" of the story, as he has everything. He is looked up to by many because of his war experience and he is an amazing fighter. He also has the perfect woman and many people are jealous of the luxury life he lives. Like many protagonists, he also has a downfall which is being caused in many ways but the antagonist, Iago. Iago is the "evil" one who is attempting to cause the downfall of Othello. He is doing this because he wants revenge on Othello for supposedly sleeping with his wife. He is the person whom is keeping the action going through his destructive plan. He is the man who is attempting to destroy everything that Othello has built up. In the first three chapters, I have found a few foil characters. I saw Iago and Cassio as foiling each other. While Iago is evil, but falsely honest, Cassio is seen as evil while he is really honest. Cassio is also very respectful and loving toward women. Iago treats women as if they are property and says extremely offensive things about them. For example he speaks of his wife by saying, "you are pictures out of doors, bells in your parlors, wildcats in your kitchens, saints in your injuries, devils being offended, players in your housewifery, and housewives in your beds." As this shows, he says very offensive things and is not much of a charmer while Cassio is a charmer. Also, Emilia and Desdemona foil one another as Emilia seems to stand back and take Iago's crude comments while Desdemona speaks her mind and says what she thinks of of his comments.