Jack Potter serves as the marshal of Yellow Sky, Texas. He commands both respect and fear from the townspeople. Accustomed to the rough conditions of the frontier, his hands are calloused and his face is weathered by the sun and wind. He feels a heavy sense of obligation to his town, which causes him severe anxiety over his recent, unannounced marriage.

Scratchy is a notorious gunslinger and outlaw in Yellow Sky. When sober, the townspeople consider him friendly, but whiskey transforms him into an aggressive menace. He wears his weapons with practiced ease and actively seeks conflict to entertain himself. His rampages follow a predictable pattern that the local citizens accept as a routine part of frontier life.

The unnamed bride is a modest, working-class woman traveling to her new home in Texas. She is neither young nor conventionally pretty, and her demeanor indicates she is accustomed to cooking and manual domestic labor. Wearing new clothes that make her feel slightly out of place, she deferentially accepts her husband's guidance and observes the luxury of the train with genuine wonder.

The saloonkeeper is a wizened, practical fixture of the Yellow Sky community. He understands the rhythms of the town and possesses the authority to manage volatile situations. When trouble arises, he acts methodically to secure his business and protect his patrons from stray gunfire. He treats the predictable violence of the frontier with calm resignation.

The traveling salesman is an outsider from the East Coast who happens to be passing through Yellow Sky. He is initially gregarious and talkative, assuming his usual social charms will work in this new environment. As danger approaches, his confident facade crumbles into visible panic. He requires direct intervention from the locals to survive the reality of frontier violence.

A local youth who tracks the movements of dangerous individuals in Yellow Sky. He rushes into the saloon to alert the patrons that the town's most infamous outlaw is intoxicated and preparing to cause trouble.