Hell

Hell is a location that multiple religious and cultural people believe exists. It is considered a place one would not want to end up in, as it holds negative connotations to themes of eternal suffering and sorrow.

Canon Media
In the original Welcome to Hell comic, and later the film, Hell is undergoing renovations at the time Sock arrives and first meets Mephistopheles. Although only the devil's office is directly shown to the audience, the film insinuates that there is much more of Hell than one might imagine, as it seems fairly chaotic by Mephistopheles' description of seeing the gluttons and lawyers having "some sort of turf war" and how network executives are hanging out with the murders, "which simply can't be a good influence on them."

Wester tends to describe Hell as being on a separate plane of existence, which is outside the realm of time (at least as humans on Earth understand it), and that there may be "dorms" or sorts where demons reside when they are not working. There also seems to be several companies that help regulate the various afterlives and class levels, such as Sinnergy, LLC.

UC Stories
Within the Universal Clarification Series, Hell is an occasionally seen location that exists on a separate plane of existence. It is the known homestead for Mephistopheles and many other demons who are bound for all eternity after death. Following from mainstream media and also revealed within one of the first few stories of this series, Hell is undergoing renovations and therefore somewhat "empty" in appearance; there is evidence provided of certain landmarks (Ex. Black Void of Nothingness, the Hall of Crippling Phobias, the Walrus Pit, etc.) still running during construction.

Part of the renovations specifically aim to upgrade the technology of Hell to provide each individual soul their own version of eternal damnation, which was inspired by Heaven's advancements. Playing off of Wester's original comic, there are rooms delegated to every resident (the nicer ones belong to the higher-level demons, naturally), but each one is personalized to contain "pet peeves" that cannot be rid of; residents may store real-world items or have resting periods in these rooms, which only Mephistopheles may access besides them.

There are also various companies that keep Hell efficiently running - especially should the devil himself be "out of office," which happens rather frequently. The most renowned (and the only one known) from mainstream media is Sinnergy, LLC; specifically within the UC Stories, other companies like Effervescence, Ltd. are also introduced.