POSTAL is an isometric top-down shooter that was released September 24, 1997 by its developer Running With Scissors. It is the first and last entry in the series to have
any level of seriousness to the story told, though it is not entirely devoid of satire or jokes.
Despite how dark the premise for this game is, though, there is a level of humor to be found as you shoot your way through Paradise. The Dude himself is a source of it, commenting on the deaths of police, military and civilians alike with a surprising, and rather ridiculous, level of detachment.
POSTAL is not exactly a lore heavy, story-driven game. At its core, it is meant to be enjoyed as a shooter, the story of The Dude is really only there to add flavor and to set the scene. Still,
that doesn't mean POSTAL fans haven't tried to dig deeper and analize The Dude's character, leading to a handful of theories as to what exactly is going on with this freak.
What little lore there is for POSTAL is told through its loading screens and is very obviously the ramblings of a madman. The very first entry we get is from the 'Home' map where Dude tells us "The Earth is hungry, its heart throbs and demands a cleansing. The Earth is also thirsty."
In the last 2 years I've been obsessed with this game, I've come up with a hefty amount of my own headcanons that include my ideas about what Dude looks like (in POSTAL 1), his personality, his
motivations and his illnesses.
The theory I'm most fond of is that The Dude is not possessed or even hearing the voice of a demon at all (at least not a real one). Instead, I prefer to think that he's no different than most real-world killers. A snake in the grass, so to speak.