These "folks in wagons and walking" on the road in Renfro stop to watch when they reach the pasture where Secretary is trying to teach Willy how to fly the plane (244). Since Secretary is black and Willy is white, the spectators' own race presumably affects the way they see this unusual sight, but the story says nothing to indicate what that is.
These "field hands" at Renfro in "Uncle Willy" "come up out of the fields" to stare up at the spectacle of Secretary trying to teach Willy how to fly the plane (244). Their perspective as they watch a black man teach a white man this skill would presumably depend on their own race, but the story says nothing to indicate what that is.
"Mrs. Christian" (the story gives her no other name) is a prostitute in Memphis whom Willy marries on one of his regular trips to the city, and an affront to most of Jefferson when he brings her back to his house. She is "twice as big as Uncle Willy," and visually conspicuous in her clothes - "a red hat and a pink dress" (236), "a red-and-white striped dress so that she looked like a great big stick of candy" (237), "a black lace dress" (238).
Secretary is the "negro boy" whom Willy hires to drive his car (235). In Faulkner's South, even adult black men are often called "boys" by white people, so although the juvenile narrator says that Secretary is "about my size" (235), he also says that Secretary is "older than me" (241) - though we have no way to know how much older. Both the narrator and Willy describe Secretary as "burr-headed," i.e. with short, bristly hair (235).
In "Uncle Willy" this unnamed man arrives in Jefferson "about six months" before Reverend Schultz and Mrs. Merridew hire him to manage the drugstore while Willy undergoes drug treatment in Memphis (232). No one in Jefferson "knows anything about him," but he arrives in town with "letters to the church," which is apparently the basis on which he is hired (232). He completely transforms the store - making it attractive to the "town trade" that had previously shunned it (233).
The mayor of Jefferson is mentioned, though not named or seen, when the women in Willy's neighborhood march with their children toward his office to complain about the woman whom Willy has married and brought home from a brothel in Memphis.
This "doctor" is invented by Willy as a way to get his rich sister in Texas to buy him a car. According to Willy's letter to her, this doctor prescribes a car as a way to save Willy from having "to walk back and forth to the store" in his fragile health (235). According to the narrator, Willy wants the car in order to get to the moonshine stills in the hills outside Jefferson and to the brothels in Memphis.
Mrs. Merridew is the character whom the juvenile narrator casts as the story's main antagonist: when he accuses Job of telephoning "Her" about Willy's whereabouts, both he and Job know he means Mrs. Merridew (246). She is a member of Reverend Schultz's church and the determined leader of the crusade to "save" Uncle Willy from his predilections, which she sees as both beastly and sinful (238).
Captain Bean's military rank may indicate that, like many other flyers in Faulkner's fictions, he is an ex-World War I aviator, but that is conjecture. The narrator simply identifies him as "Captain Bean at the airport" in Memphis (241), a man who refuses to teach Willy how to fly without a certificate from a doctor but who, apparently, is willing to teach Secretary, Willy's black driver - which seems to flaunt the rules of segregation.
