The "landlord" Mink thinks about in The Mansion while serving his prison sentence in Parchman is a composite figure, made up of the various property owners who over the years have hired and fired him and his family as tenant farmers (102).
In The Mansion Mink's wife Yetti goes back to her "people" after he is sent to jail (104). (Faulkner seems to have forgotten the biography he created in The Hamlet for the woman whom Mink marries and brings to Yoknapatawpha; if you take that earlier account into account, it's extremely difficult to imagine who her "people" might be. See the entry for Yettie Snopes in this index.)
The foreman of the "Grand Jury" that found Mink guilty in The Mansion is in later life "a hale (hence still quick) eighty-five"; he runs "a small electric-driven corn-mill" but also spends a lot of time "hunting and fishing with Uncle Ike McCaslin" (407). (Faulkner may have meant "jury," because Grand Juries of course prepare indictments, but don't deliver verdicts.)
These are "the cops" in The Mansion who put out the burning cross in front of 'The Mansion,' i.e. the house where Linda Snopes Kohl lives with her father (252). The narrative says they were "outraged and seething of course, but helpless" - what they are outraged at, however, seems to be the fact that the house belongs to "THE banker" (252). (Faulkner usually identifies the police in Yoknapatawpha as sheriffs, deputies and marshals, but the term 'police' becomes more common in his later fictions; this use of the term 'cops' is even rarer.)
Jefferson's African-American population appears in The Mansion indirectly, in several narrative references to them as a group and from several different political perspectives. On his trip into Jefferson at the beginning of the novel, for example, Mink walks through a "section [of] all Negro homes" (38) between the Square and the railroad depot; his thoughts seem to include the actual 'Negroes' who live in these homes, though no people come clearly into focus.
In The Mansion these Japanese troops attack the retreating group of Americans as well as "Aussies, British, French from Indo-China" somewhere in "Malaya" at the start of the Second World War (305). They are never seen, but readers hear them "chirping" in the dark just beyond a line of American foxholes. Their "English" is the stereotypical dialect that once was spoken by Asians in (white) American popular culture: "Maline" (i.e. Marine), "Tonigh youdigh" (306).
Ratliff hypothesizes in The Mansion that one of the young men in Frenchman's Bend might "persuade" a young girl on a Wednesday night to go "off into the bushes before her paw or maw noticed she was missing" (134).
According to Charles in The Mansion, Ratliff expects that "some woman" will come along one day and marry Gavin Stevens, after deciding that he is "dependable enough at last for steady work in place of merely an occasional chore" (215).
Clarence Snopes invents this soldier as part of his smear campaign against Devries in The Mansion, spreading the rumor that during the war Devries chose to save the Negro soldier and left this white one to die (345).