This is a "Wild Mass Guess" entry, where we pull out all the sanity stops on theorizing. The regular entry on this topic is elsewhere. Please see this programme note.
Grand Unifying Guesses Purgatory aka: Purgatory
Purgatory is a diverse place with many people "working it off", and consists of...
Lester the Rat of Beakman's World. And each of the female assistants. Josie was the lucky one, Liza was less lucky, and Phoebe...well, she's probably still there. Waiting. As for Beakman...well, he's the timekeeper.
The 2004 Phantom of the Opera is a purgatory for King Leonidas of 300. Can you think of a worse punishment for a macho king than to be forced to sing and leap around with a disfiguring scar?
Kino, interestingly, is traveling in Purgatory/Hell, but she's not condemned to it. She's touring and quite enjoying herself.
The Court at Gunner's Crag is Purgatory for the Suicide Fairies and some humans (like Mort). The Guides are atoning for past wrongs by escorting souls.
Dr. Drakken, repeatedly using his often misguided genius for a grab at world domination, only to be knocked down by two schoolkids and mocked by his sidekick.
Everyone in Eastenders. You don't need to believe this to see Walford as a circle of hell.
Blood Gulch - though perhaps Jossed by Reconstruction. This is also why Church may have died, but can't move on - I'm sure you agree he could if he would.
The cul-de-sac in Ed, Edd, and Eddy. Following the theory that hell is other people, they all make each other miserable. Notice that YOU NEVER SEE ANYONE ELSE THERE.