What insights can we discover from Camus novel, The Plague, about moral motivations? This is best done by focusing one character (perhaps two, but not morefor the sake of focus). Of course, you can bring in points about or remarks/reflections by other characters, but your focus should likely be on one character. Almost all of you will include Rieux to some degree in your paper, at least as a foil to shed light on the character you are focusing on, and Rieux himself could also serve as the main focus. But you could also focus on Tarrou, Rambert, Paneloux or Cottard. I dont think we have enough about M. Othon for a focus, but he (or even Gonzales) could shine light on the person you do discuss.
Remember that the narrator, Dr. Bernard Rieux, perhaps with the author, Camus himself, is reluctant to endorse any specific moral principles, especially if such principles might pass judgment on individuals who are acting on behalf of a personal value that they deeply feel that gives meaning to their lives.