Journal #1 - The Stranger

Marie-
Marie is described as being an old acquaintance as well as sexually attractive to Meursalt. They both fill their basic sexual and companionship needs with each other. But for Meursalt, this is all that he really needs, and does not pursue love, whilst Marie very much wants Meursalt's love.
Marie acts as a foil to Meursalt. She retains hope throughout the novel while Meursalt remains indifferent and hopeless, highlighting the absurd idea that Meursalt conflicts with. Camus shows this contrast when Marie asks about love and marriage with a hope for Meursalt's love, and Meursalt remains indifferent to love and marriage.

Raymond
Raymond is described as a shifty type of character seeming to be connected to the underworld. But Meursalt tolerates them and Raymond is friendly to Meursalt because of this. Raymond also admits to having a short fuse, and seems resorts to violence in aggravating situations. He also resents the popular opinion on him, claiming that he is an honest man.
Camus seems to use Raymond to push the plot, having many events in the book take place around Raymond's actions. For instance, Raymond invites Meursalt to the beach, which leads to the climax of the story. Raymond also gives Meursalt the gun, which allows him to kill the Arab. It can be said that Raymond is responsible for many of the events taking place in The Stranger.

Salamano-
Salamano is described as being old and angry. His constant companion is a dog, which in many ways represents his spouse, whose death was the reason he got a dog in the first place. Although he acts angry and ungrateful towards the dog, it is revealed that he cared much for the dog.
Camus uses Salamano to highlight the natural human fear of change. Salamano is what one could call a conservative. He walks his dog along the same path everyday at the same time, not changing the route in all of the years they've been together. Salamano also becomes incredibly used to the dog, and once the dog is gone, he becomes nervous and flustered.
Salamano also parallels Maman. Maman cried a lot when she was put into the home, but not because she missed Meursalt, but rather because she was not used to the home.