Alastor "the Radio Demon" is a fictional character created by Vivienne "VivziePop" Medrano who primarily appears in the musical adult animated series Hazbin Hotel as one of the overlords of Hell.

He is often accompanied by the hotel's bartender Husk and housekeeper Niffty (whose souls he owns), and he is considered a rival by fellow overlord Vox and Charlie's father, Lucifer.

[8][9] Alastor was created by Medrano during her time at School of Visual Arts in New York City,[10] appearing unnamed on her DeviantArt page "circa.

[13] Short comics about ZooPhobia published to Medrano's DeviantArt and Tumblr pages would see Alastor attempt to take the place of fellow deer-boy Autumn,[14] and to convince Damian (the webcomic's Prince of Hell) to make a deal with him,[15][16] while himself being in love with "KayCee", an all-powerful ancient being.

[32] Alastor returned in a starring role in "A Day in the Afterlife" (alternatively titled "The Radio Demon"), an official webcomic published on October 19, 2020.

In "Overture", one week after the events of the pilot, Alastor makes a television commercial for the hotel with Vaggie, Husk, Angel Dust, and Niffty, noting it to have been seven years since he was active in Hell.

", following Charlie failing to pitch the hotel to Heaven again, with one month to go until the annual Extermination, Alastor convinces her to make a deal with him, telling her about Carmilla killing an angel, in exchange for a binding future favor.

[36] Since 2018, official clothing and merchandise based around Alastor and the cast of Hazbin Hotel designed by Medrano have been available intermittently from Shark Robot LLC.

[37][38][39] In 2024, an emote entitled "Reaper's Showtime" was added to the video game Fortnite, depicting the player character dancing with a scythe matching Alastor's color scheme, while playing the fan song "Insane".

Esther Liberman of BeLatina described him as "caricaturesque, impossibly rotten and flatter, like a perverse version of a third-generation descendant",[41] while Dan Short of Animated Views called Alastor the "show-stealer" as one who is "charismatic and extravagant with smile-inducing flare while making it subtly clear he is as evil as he's feared to be", complimenting Edward Bosco's "magnificent" vocal performance and Gabriel C. Brown's "wonderfully inspired" singing voice.

", while also complimenting the "phenomenal" sound design behind Alastor and Vox, with the "shifting static of radio and VHS tracking buzz from nostalgic television sets heighten[ing] their subtextual emotions".

[5] Another reviewer, Mae Abdulbaki of ScreenRant, has said he has "a particularly intriguing character" during the series, noting his "mysterious and seemingly dangerous, yet protective and snarky" attitude.