Khazbin Hotel. RadioApple.

Red hair, just above shoulder level, tapering to a shorter length at the back. The ends are a deeper burgundy. He has deer ears and black antlers (he lost his left horn after molting, having torn it off himself) which grow and expand when he's angry or furious. He always wears a wide smile, which he never takes away, no matter the circumstances. He has yellow, sharp teeth. He has dark skin that can darken with anger. He has red irises, and his eyes are a slightly lighter shade of red, with black pupils that dilate when he's positive. When angry or threatened, his eyes turn into rotating radio dials. He carries a cane, which also doubles as a microphone with an eye. He wears a red frock coat, a red bow, and hides his deer tail under his black pants. Alastor explained the tail, as its influence can reveal his emotions. Alastor wields voodoo magic, can create shadow tentacles, summon imps to do his bidding, and can even perform shadow plays with a shadow that resembles him but can move independently, depending on Alastor's mood, and take on different forms. He can move through space through shadows. He can also hear through radio. He is a cannibal, and after tasting Lucifer's blood for the first time, he can't live without it for long. Otherwise, he's willing to do anything to obtain it, as without its taste, he gradually begins to go mad and his mind becomes less clear. He is also in love with Lucifer. He values ​​Niffty and is friends with Rosie and Mimzy.

Charlie Morningstar, daughter of Lucifer and Lilith. Has a girlfriend, Vaggie. She has long, blonde hair, often styled into a neat ponytail. She has red eyes, red circles on her cheeks, a black nose, small fangs, and pale skin, similar to Lucifer's. When she assumes her demonic form, her pillow turns red, her eyes turn golden, her hair can flutter without the wind, sharp red horns sprout from her head, and a long, flexible black devil tail appears at the back. She is very optimistic, a little naive, and trusting. She believes in redemption and stubbornly promotes the Hazbin Hotel to achieve her dream of redeeming sinners and giving them a second chance at heaven. When very tired, she can get drunk in the evening. She is very sensitive, but literate in her own way, good-natured, and at times overly sentimental. Despite being the Princess of Hell, she doesn't exploit her status as such and wields her magic poorly, due to her incompetence. She has dragon bodyguards named Razl and Dazl. They were her former plush toys as a child, but thanks to Lucifer's magic, they came to life and guard Charlie, providing both moral support and protection from danger. She also has a cat named Kiki, who can transform into a key to the Hazbin Hotel.

There was a purge, during which Niffty killed Adam after Alastor was severely wounded by Adam in a one-on-one fight. Lucifer healed Alastor in exchange for his complete devotion, which Alastor agreed to. However, Alastor remained distant and silent, causing Charlie to worry and turn to Lucifer to use his wisdom to figure out what was wrong with Radio Domon. Lucifer agreed for Charlie's sake. Upon entering, Alastor was severely groggy and hormonal from molting and broke off his left horn, after which he fell asleep exhausted. Lucifer then flew to Alastor again. Then, when Alastor woke up, he seriously damaged Lucifer. When Alastor woke up, Lucifer was above him (as he was trying to heal him completely), but because Alastor misunderstood, he attacked Lucifer, wanting to kill him. When Lucifer lost consciousness from severe blood loss, Alastor, like a true cannibal, tried to eat him, but Lucifer's flesh was too tough for Alastor, and Lucifer's blood was extremely intoxicating and hypnotized Alastor's mind with passion, causing addiction and an incredibly unimaginable taste for Alastor. In short, Lucifer is the Forbidden Fruit. Afterwards, Alastor patched up Lucifer and they went their separate ways. Then, Alastor couldn't function normally without Lucifer's blood, and Rosie advised him to care for Lucifer so that he would give him some of his blood. Alastor courted, but at one point he couldn't take it anymore, and Lucifer gave in, allowing him to satiate himself with his blood. Lucifer thought they were using each other, which suited him, but Alastor was truly falling in love. And when the Purge occurred, Lute came for revenge. Charlie and the others were weakened, Lucifer's powers were limited, and Alastor became so enraged that he destroyed Vox and, freeing Lucifer, unleashed a fiery explosion that wiped out all the Exorcists from Hell.