honestly, the origin they've settled on feels more like a patchwork quilt than a clear tapestry. From what I've pieced together from the show and the creator's offhand comments, Alastor was just a guy in 1930s New Orleans. A radio host, maybe even involved in some unsavory things, who died under mysterious circumstances and wound up in Hell with immense power overnight. The 'why' is the big gap. Some fans theorize he made a deal with something even older than the usual demons, which fits his 'eldritch horror' aesthetic peeking through the radio static. But the narrative deliberately keeps it vague, which I find frustrating more than intriguing sometimes.
His power level is the real puzzle. Most overlords in 'Hazbin Hotel' clawed their way up over centuries. Alastor just... appeared. That implies a shortcut, a pact with a Leviathan-level entity, or maybe he's the personification of a specific sin related to manipulation through media. They've hinted he's 'tethered' to something, which suggests his freedom is an illusion. I prefer that angle—a charismatic monster who's also a puppet on a longer string. It makes his cheerful menace sadder and more complex.
My personal take, though, is that the mystery is starting to wear thin. After a full season and a pilot, we need more than cryptic smiles and jazz hands. An origin shouldn't explain away his menace, but ground it. I'm hoping season two gives us flashbacks, not just more teasing. For now, his origin is a delicious void fans keep filling with their own headcanons, which is fun but leaves me wanting the real, canon meat.