Linda is Willy Loman's supportive wife, who compares her husband to a "little boat looking for a harbor." She sympathizes with her husband's lack of success and is deeply disturbed when she discovers a rubber hose that Willy plans on using to commit suicide. She also chastises her sons for their selfish actions and lack of concern for Willy.
Bernard is Biff's childhood friend and neighbor. As a child, Bernard was unathletic, but he studied hard and developed positive character traits that led to his success. He also functions as Biff's foil and grows up to be a prominent lawyer.
Charley is Bernard's father, and Willy's only genuine friend. He lends Willy money each month and even offers him a job. Unlike Willy, Charley is a realist and a successful businessman.
Jenny is Charley's secretary, and she is disturbed when Willy arrives to see her boss.
Ben is Willy's fortunate, successful older brother. He is deceased and appears during Willy's hallucinations. Ben speaks to Willy and ends up encouraging him to commit suicide. Willy views his brother as the epitome of success and regrets not traveling with him to Alaska.
The Woman has an affair with Willy when he travels to Boston. Biff ends up accidentally meeting her when he travels to Boston to ask for his father's help. Her memory constantly haunts Willy, who feels guilty about cheating on Linda with her.
Howard Wagner is Willy's young, privileged boss, and he ends up firing Willy when he asks for a meeting to discuss moving to a sedentary position in the city.
Miss Forsythe & Letta are two women that Happy and Biff meet at the restaurant. Willy's sons end up leaving him behind when they go out on the town with Miss Forsythe and Letta. Their characters emphasize Happy's and Biff's superficial, selfish personalities.
Stanley is the waiter at the restaurant where Happy and Biff are supposed to treat their father to a nice meal.