Basically, in addition to Ghost, here are some of the recurring trolls and other characters:
The Engineer: Ghost's right-hand man. Handles technical stuff and speaks only in gibberish. Not very good at his job, and sometimes takes over the show. Loves the movie "Boss cupcakeer" for some reason.
Ghetto Capitalist: What Blackfoot thinks he is. A guy who makes money "the ghetto way" (read: running get-rich quick schemes, and abusing welfare), and tells Ghost about these shenanigans. Basically, Ghost's archenemy.
Tub Guy: A flamboyantly bisexual man who calls from his bathtub, hitting on Ghost and everyone else, playing off Ghost's homophobia.
The Internet Buttstalker: Another flamboyant man who hits on Ghost, often calling him "Baby Buns".
"Suck Mah Dick" Guy: A troll who'd call in, yelling "SUCK MAH DICK!!!" over and over again. Was actually a lot smarter than he let on, being quite knowledgeable on a wide variety of subjects, and able to hold long, legitimate conversations with Ghost. Well, before reverting to his catchphrase.
Coodoo17: A guy who'd call in singing songs mocking Ghost, or would make fake radio ads about things that would piss Ghost off.
Asho: Mexican-American teenager who'd call in about his own schemes, or whatever bizarre events in his life were going on at the time.
Nikolai: "Russian" caller (Ghost mistook his accent for Russian, so he decided to roll with that) who would boast about communism, and play off of Ghost's Russophobia.
Gasgara: A sentient tree with his own Twitter account. Okay, really just a guy obsessed with lumber stocks for some reason, so everyone started saying he was really a tree. He decided to play along.
NavyHuskie: A guy who'd make musical remixes of Ghost, and play them on the show. Was by far the most normal person on True Capitalist Radio.
Goofy_Bone: Foul-mouthed, Mexican-American wannabe (but hopelessly incompetent) gangsta rapper, sycophant of Ghost, and all-around dumbass.
Tzeki: Intellectual British caller. Another friend of Ghost's, and Goofy_Bone's archenemy. The two would get into fights ALL the time.
The Aborted Fetus: Perverted 8-year-old who would try to solicit anal sex from Ghost.
Tri$ha/Noteparty: Transwoman teacher (sometimes, her occupation would change at the drop of a hat) who'd play off Ghost's homophobia.
Rina-chan: Professional voice actress Kira Buckland before she made it big. Would call in, pretending to be various characters from "My Little Pony: Friendship is Magic", and suggest doing deranged things to or with Ghost.
Edna: Middle-aged woman whose calls would consist of telling Ghost about something disgusting she'd done recently.
And these are just some of the more prominent callers.