Sibonia
Sibonia is Libby's sister and they are both slaves living in the pen outside of the Pikesville. She was sort of short tempered because when Onion asked about Bob, she threw a ball of mud at him.
Ms. Abby
She is described as a white woman wearing red lipstick and a face covered in powder smoking a cigar. She is in charge of the prostitutes and Onion was sent into her room to get forced to work since he accidentally said that he worked in that field of work.
The Reverend
We meet Reverend Martin again on page 112 after Fred shoots and kills a Good Lord Bird. Him and Onion hear horses coming towards them so Fred orders Onion to hide. One of the men riding up to greet them turns out to be The Reverend, "the feller Fred drawed on back at the Old Man's camp" (McBride 112). He was wearing "his two shiny pearl-handled numbers on his belt, which he likely stole off some dead Free Stater, for he hadn't had them things before" (McBride 112). This proves that he has changed himself, at least physically, from the last time that Onion and the army had seen him. As soon as Fred recognized Reverend Martin, he shot him in the chest and said "'That'll teach you to draw on me, you apple-headed, horse-thieving, nigger-loving bastard'" (McBride 113). He then proceeded to gloat about killing Fred, almost as if he had been hunting a large animal, saying, "'I got me one of the Brown's boys,' he said proudly. 'Got the biggest one'" (McBride 113).
It is interesting seeing how the Reverend has flip-flopped from being a part of John Brown's army to leaving, joining up with and maybe even leading what seem to be Pro Slavers, and then killing Fred Brown in cold blood.
Pie
We meet Pie when Chase, one of the men that brought Onion and Bob to Missouri, takes them to the Pikesville Hotel. Onion thought that there "weren't nothing compared to seeing that bundle of beauty coming down them stairs that first time. She would blow the hat off your head. She was a mulatto woman" (McBride 144). She was a black prostitute and apparently Chase owes her $9.
Darg
Darg works for Ms. Abby who uses him as an enforcer. That is all we know about him so far.