According to Ned in The Reivers, the "hollow" where they "stable" Lightning before and between races is on land "that belongs to one of Possum's [Parsham's] church members" (217).
Identified in The Reivers only as "a Negro," this man works for Mr. Rouncewell and pumps gasoline into the (few) cars that pull up to the tank beside the railroad tracks (46). He is not allowed to handle any money.
In The Reivers Lucius compares the "females" of his childhood to the ones alive "now" (191). According to what he has heard, modern women not only "run in and out of gentlemen's rooms in hotels" - they do so wearing "the shorts or scanties" that seem to be the uniform of "their fight for freedom" (191).
In The Reivers Boon brags to this "group of men on the Square" about how fast he can make the car go (40). Many of the Yoknapatawpha fictions include a reference to the un- or under-employed men who hang around the Courthouse during the day; presumably these men are of that variety.
These are the "street- and assessment commissioners" with whom Mr. Binford negotiates and the policemen he pays off as part of his responsibilities as the man of Miss Reba's house in The Reivers (111).
In his account in The Reivers of the first time Coppermine (AKA Forked Lightning) raced against Acheron, Parsham Hood briefly mentions "that Memphis boy" who was riding the horse (220).
These are the "liquor dealers," "grocers and coal merchants," "plumbers," "newspaper boy" and other tradesman and laborers with whom Mr. Binford negotiates in The Reivers as part of his responsibilities as the man of the house that Miss Reba runs (111).
In The Reivers Lucius Priest tells his grandson (also named Lucius Priest) that when their common ancestor Lucius McCaslin came to Mississippi in 1813, he brought "his slaves and foxhounds" with him "across the mountains from Carolina" (61). Presumably one of these enslaved people is the grandmother of Ned McCaslin, who has her own Character entry; otherwise this novel says nothing more about these people. More about some of them, at least, can be found in Faulkner's earlier novel, Go Down, Moses.
The Reivers doesn't provide much detail about the unscrupulous man who cultivates a patch of mud in order to sell his services to mired automobile travelers. Physically he is "a gaunt man, older than we - I anyway - had assumed" (86).
These are the employees of Priest's livery stable in addition to the five who are mentioned by name. The Reivers characterizes them as "all the Negro drivers and hostlers" and "the last lowly stall cleaner" (7). Besides the day and night foremen, apparently the only white employee is Dan Grinnup.