Costco -1

Costco -1 is the Hell of the infinite costcos housing the devil himself. Anyone who is sinful who has died goes to here as punishment for their sins. When dead sinners get transported to this Costco, they get tortured and live in eternal pain and suffering as punishment for their sins.

History
Costco -1 is one of the earliest inhabited costcos. being founded by The costco's caretaker and the devil where they turned it into the hellish landscape it is today. With turning it into said landscape, it allowed for the location to act as a place where the dead who have sinned to finally rest in eternal suffering. At some point the DOOMer mysteriously made his way into the costco and is currently trapped within it.

Costco -1 Caretaker
This is the person who has been designated to run Costco -1 and to record all the sinners who have been transported into it. They are a mysterious person of which many theories about them ranging from him secretly working for the 8 ball to them being a disciple of the devil.

The Devil
The devil is in charge of torturing the sinners to punish them for their sins and challenges people to fiddle matches and offers a golden fiddle to residents. He also allegedly exists outside of the Infinite Costcoverse.

The DOOMer
The DOOMer is the only human resident of the costco and is very well versed in combat. He can often be seen killing hellspawn and has stated that after he has exterminated the hellspawn, he will go after Kirkland Signature.