At San Diego Comic-Con, Hazbin Hotel creator Vivienne Medrano has confirmed the shows future seasons will fill in many of the assorted blanks in Alastor’s clouded personal history. Voiced by Amir Talai, the debonair, ever-smiling Alastor is among Hazbin Hotels most intriguing characters, said to have returned to Hell after a mysterious seven-year absence. Making himself indispensable to Erika Henningsens Charlie Morningstar and her plans for the shows titular hotel, Hazbin Hotel season 1 also revealed that Alastor is attempting to use his influence over the Princess of Hell to free his soul from the service of an as-yet-unnamed character.

https://screenrant.com/hazbin-hotel-show-future-alastor-backstory-creator/