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 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
Husk does not appear to have friendly feelings towards Alastor, having had his soul be owned by him. In the pilot, while he is surly towards most people, Husk displays open and unafraid disdain towards Alastor when forcibly summoned to the hotel, being furious instead and not shy to let Alastor know it, going so far as to physically shove him.

His genuine fear only manifesting when Alastor directs his anger specifically at him. This fear is most pronounced when Alastor summons the chains, reminding Husk of the ownership Alastor holds over his soul. In these moments, Husk visibly trembles with apprehension. Conversely, when Alastor directs his anger towards others, Husk adopts an outwardly indifferent demeanor.

Alastor 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 Alastor has summoned him on other occasions, with Husk being pictured alongside him as he destroys souls in Vaggie's tale.

Vivziepop has described Alastor's view of Husk as less than flattering, stating that he sees him as a sad and lonely drunk. According to Faustisse, Alastor considers Husk, along with Niffty and Rosie, to be his only close friends. It is unclear whether Husk returns this sentiment.

Lucifer
In "Dad Beat Dad", Lucifer showed jealousy towards Alastor when the he began showing his "deep" bond with Charlie for his support of her dreams and goals of the Hazbin Hotel. Lucifer was obviously threatened by Alastor taking Charlie away from him and was incensed when Alastor pointed how little support Lucifer had given Charlie in her dreams, with Lucifer becoming increasingly insecure of his father-daughter bond with her and began to fight with Alastor to get Charlie's attention.

Alastor is also shown to be somewhat petty when it comes to Lucifer, casually making smug comments about Lucifer's height. Though surprisingly, Lucifer himself is able to irritate Alastor enough to somewhat chip away at his normally composed facade, even causing Alastor to drop all pretenses and swear at him.

Vivziepop and Dave Capdevielle both 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 20 battles with Alastor, Alastor does not show any recollection of him and was dismissive of him altogether; it is presumed that he does not think much of Pentious.

Mimzy
Vivziepop thinks that Alastor and Mimzy may have known each other in their living lives. She gives their familiarity as the reason for their good relationship in the Hotel.

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.

As revealed in "Dad Beat Dad", Alastor and Mimzy are old friends, having known and befriended each other back when they were alive as humans. As Mimzy revealed, the two of them frequented a jazz club together and enjoyed drinking and dancing together. This friendship continued when the two fell into Hell. As shown where Alastor would warmly greet Mimzy by hugging her. Due to their long friendship, Mimzy knows Alastor personality and history intimately.

However, despite their friendship, it is also apparent that Mimzy uses Alastor for her own ends. As shown where she went to the Hazbin Hotel to hide from the loansharks she borrowed 50k from and apparently stole a car from (which she then crashed into the loan shark's girlfriend). With Mimzy fully expecting Alastor to dispatch the loan sharks when they came searching for her, showing that Mimzy is fully willing to take advantage of Alastor's immense power and influence as a Overlord for her own benefit. As stated by Husk, Mimzy only goes to Alastor when she wants something, implying to her having caused numerous incidents such as this one in the past.

Alastor in turn is fully aware of Mimzy's selfish personality and knows that she takes advantage of him to "clean up" the messes she makes. Alastor however has stated that he doesn't mind helping her and that he can handle whatever mess Mimzy gets herself into. Showing and implying to Alastor's fondness for his old friend.

However, as shown in the end of "Dad Beat Dad", it becomes evident that there are boundaries to what Alastor can endure from Mimzy. Following the chaos she unleashed with the loansharks, Alastor tells her to leave and to not return to the Hotel, with him warning her that he will not tolerate her endangering the Hotel and its residences due to her selfishness, only allowing her to stay if she is is genuinely interested in redemption. Mimzy, shocked at this statement, was surprised for his genuine concern for the Hotel.

Insulted by Alastor's warning, Mimzy left the Hotel.

Rosie
Alastor is affiliated with Rosie, though they have yet to interact in the show. In the The Radio Demon comic, Alastor greets several girls in the Cannibal Town 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.

In The Radio Demon 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 swears, calling Vox obnoxious, pompous, egotistical, and annoying.

Their rivalry and distain for one another is made clear in "Radio Killed the Video Star". Seven years prior to series, Alastor and Vox engaged in a confrontation where Alastor nearly beat him. Furthermore, their duet, "Stayed Gone", emphasizes their respective stances on technology and even their past with Alastor mentioning how Vox asked him to join his team but declined.