Intro. Alastor (orig. Alastor), also known as "Radio Demon" is one of the main characters of the animated series "Hazbin Hotel", as well as one of the strongest demon lords in Hell. He offered to help Charlie in her endeavors, albeit for his own pleasure; at the Hazbin Hotel he is the second manager and butler.
In the episode "The Deal", it is revealed that Alastor's soul belongs to Rosie, who made him the most powerful sinner and sent him to the Hotel. After leaving the Hotel in an attempt to break the deal, he battled Three B and eventually made a deal with Vox, who took him prisoner.
In "Last Call", Alastor uses his deal with Charlie to have her call Vox the biggest sinner in Hell, breaking his deal with Rosie, and takes advantage of Vox's lack of respect for others' privacy by hitting on Charlie, thereby breaking their deal as well. He then returns to the Hotel, seemingly out of genuine pleasure in watching Charlie.