Alastor/Relationships

Charlie Morningstar
Alastor assists Charlie with her endeavors, but he makes it abundantly clear that he is only doing it for his own interests, as opposed to believing in Charlie's ideas of redemption. However, they have a similar sense of humor. In his reprise, he tells Charlie that he thinks she's "one of a kind" as well as a "charming demon belle".

According to Vivziepop in one of her streams, Alastor thinks Charlie is funny and likes talking to her.

Vaggie
Alastor and Vaggie's relationship started off hostile, with her threatening him at spear-point, referring to him as a "pompous, cheesy, talk-show shitlord".

It is presumed that Alastor is aware how easy it is to rile up Vaggie and does so on numerous occasions for his own amusement, with taunts or invading her personal space. It appears that Alastor does not take Vaggie's threats seriously due to being one of the Overlords of Hell; he even mentioned that if he truly wanted to hurt them, he "would have done so already."

Niffty
As shown in the pilot, Alastor and Niffty are acquainted with each other. Niffty seems to have a positive view of Alastor.

Faustisse, however, described Alastor's view of Niffty as like his "obnoxious adopted daughter". They joked that he finds her adorable, but also stupid, and that he would also forget her name.

Both Husk and Niffty are pictured silhouetted behind Alastor in the overlord line-up in the pilot. According to Faustisse, Alastor considers Niffty, along with Husk and Rosie, to be his only close friends.

Husk
In the pilot, Husk does not appear to have friendly feelings towards Alastor. While he is surly towards most people, Husk displays open and unafraid disdain towards him when forcibly summoned to the hotel. Husk is furious to be dragged away from his gambling table and back into Alastor's services, and isn't shy to let him know it, going so far as to physically shove him.

Alastor, however, is aware of Husk's vice for alcohol and is happy to indulge him in it as a means of bribery. After arriving at the hotel, Husk demands to know what Alastor wants with him "this time", implying that he has been summoned by Alastor on more than one occasion. While the accuracy of Vaggie's story about Alastor's overnight ascent to power is yet unclear, Husk is pictured alongside him as he destroys souls.

Despite Alastor's power and reputation in Hell, Husk does not seem to be afraid of him.

Alastor and Husk are known to be acquaintances and, according to Faustisse, also business partners. VivziePop has described Alastor's view of Husk as less than flattering, stating that he sees him as a sad and lonely drunk.

Both Husk and Niffty are pictured silhouetted behind Alastor in the overlord line-up in the pilot. According to Faustisse, Alastor considers Husk, along with Niffty and Rosie, to be his only close friends. It's unclear whether Husk returns this sentiment.

Lucifer
Alastor has yet to interact with Lucifer, at least on-screen.

During the pilot, he looks at a royal family portrait hung in the Happy Hotel, seemingly recognizing Lucifer.

When asked what would happen if they met, Vivziepop stated that Alastor would kind of like Lucifer; more specifically, Alastor would like Willy Wonka because he's a jerk and then said Lucifer has a lot in common with Willy.

Vivziepop and Dave also stated that Alastor in no way would be afraid of Lucifer; and that there is mutual respect going on between them.

Angel Dust
It is currently unknown what Alastor's thoughts on Angel are, though it is believed that he is largely indifferent to him; it is noteworthy that Alastor was visibly taken by surprise by Angel's offer for a blowjob, but quickly regained his composure and swiftly turned down the offer.

Sir Pentious
Despite Sir Pentious claiming to have had a battle with Alastor prior to the events of the pilot, Alastor does not show any recollection of it and was dismissive of him altogether; it is presumed that he does not think much of Pentious, due to being an Overlord. He then proceeded to quickly and methodically destroy his laser and airship within seconds.

Mimzy
Mimzy and Alastor have yet to interact on-screen.

During Mimzy's development, across Zoophobia and early drafts of Hazbin Hotel, she was "head over heels in love" with Alastor and early illustrations depicted the two in what appeared to be a romantic relationship. This element of their dynamic has since been moved on from, with Alastor being re-written as uninterested in all forms of romance.

When asked about how she sees the two in the current series, VivziePop thinks that Alastor and Mimzy may have known each other in their living lives (Although, whether they ever had the chance to meet in person given their separate geographical locations is unclear). She gives their familiarity as the reason for their good relationship in the hotel. Faustisse has the opinion that Mimzy's crush on Alastor is a "joke that will never die".

Furthermore, when asked about Alastor and Mimzy, Vivziepop stated the two of them would get along due to them having a similar timeframe that they existed in.

VivziePop describes Alastor as finding Mimzy extremely charming, although he is the only one who apparently sees this in her, as she is "absolutely terrible" to everyone else and this causes them to dislike her.

Rosie
Alastor is affiliated with Rosie, though they have yet to interact in the show. In the Hazbin Hotel comic, The Radio Demon, Alastor greets several girls in the Cannibal Colony and afterward asks them to give Rosie his regards.

On Twitter, Vivziepop stated that Alastor and Rosie's relationship is very similar to Jack and Mary's relationship in Mary Poppins Returns.

According to Faustisse, Alastor considers Rosie, along with Niffty and Husk, to be his only close friends. They think that Alastor and Rosie have known each other for a while.

Vox
According to Vivziepop, the two don't get along due to their different views and preferences when it comes to technology. The two have yet to interact in the series but have been described as being hated rivals.

In his prequel comic, Alastor briefly sees Vox's advertisements while passing by a store. When confronted by Vox, Alastor states he is a "show off" who's "all hat and no cattle!"; upon getting some distance away, Alastor quietly grumbles and calls Vox obnoxious, pompous, egotistical, and annoying.

Their rivalry and distain for one another is made clear in "Radio Killed the Video Star." Approximately, seven years ago prior to the events of the series, Alastor and Vox engaged in a confrontation that nearly result in Alastor nearly beating him. Furthermore, their duet, "Stayed Gone" emphasizes their respective stances on technology and even their past with Alastor mentioning how asked him to join the Vees but declined.