First Billed:[]
Non Affiliations:[]
- Montgomery "Monty" Earl
- Jimmy - an inmate who arrived with Alex, Zee and Monty. Ended up sabotaging the main escape plan of the story by calling on guards as Alex, Zee, Toby and Gary fled into Room 2. Status unknown; presumed dead.
- Toby Merchant - a very young inmate who arrived with Ashley and Gary. Was originally going to commit suicide with Ashley, but was dissuaded and became part of the main escape plan. In the explosion in Room Two Toby was badly injured, but begged Alex to jump into the river anyway. In Solitary, Zee confirms Toby never resurfaced and died in the river.
- Ashley Garett - an inmate who arrived who arrived with Toby and Gary. Tried to commit suicide with Toby, refusing to do so alone. Killed by Alex.
- Carlton Jones - Zee's cellmate. Status unknown.
- Adam
- Ozzie - an inmate who'd escaped the infirmary and lived with Pete and Simon under genpop. Is killed by Alex in one of Alex's trials in becoming a blacksuit.
- Scott White - the first inmate to perform a legitimate escape attempt in Furnace. His plan was to crawl through the then existing air vents and onto the elevator up. Nearly made it but was caught by blacksuits and was executed by the warden's dogs back in genpop.
- Oli - an inmate from the Furnace short stories best known for being a terrible barber. Status unknown.
- Batek - an inmate introduced in Silent Night, a good friend of Donovan and Adam. Killed by Kevin.
Gang Members[]
Skulls:[]
- Ambrose Pope - The original leader of the Skulls, introduced in Silent Night. Killed in his sleep by Kevin.
- Kevin Arnold
- Gary Owens
- Bodie
- Pete - Former Skull gangster, had been taken in during the Summer of Slaughter. Had become a rat in the infirmary and lived with Simon and Ozzie. At the end of Solitary he stayed behind with Ozzie as Alex and Simon started climbing the incinerator, but is presumed dead in Death Sentence when the tunnel he is hidden in is blocked off by Cross.
Leopards:
- Santiago - Leader of the Leopards, was killed in the Room Two cave-in under Ambrose's meddling.
- Figi - Santiago's right hand man, killed in the same cave in.