Stella is Blanche's younger sister, married to Stanley, and mother to their newborn child. Her life in New Orleans offers a stark contrast to her upbringing, and she often finds herself between her sister and her husband.

Stanley is Stella's husband, characterized by his loud and stubborn personality, and works in a physically demanding job. His dislike for Blanche is clear, and he exerts considerable control over the household.

Mitch is a friend of Stanley's who becomes romantically interested in Blanche. He stands out from his friends due to his more sensitive and caring nature.

Eunice is the Kowalskis' upstairs neighbor and landlord who is supportive of Stella and plays a role in household matters. She has occasional conflicts with her husband, Steve.

Steve is Eunice's husband and a friend to Stanley. He participates in the household's social activities, including poker games.

The Mexican Woman is a street vendor who appears in a pivotal scene, selling flowers and singing, which impacts Blanche. Her presence creates an atmospheric moment within the play.