Charlie Morningstar/Relationships

Vaggie
Charlie first met Vaggie in an alleyway, with the former patching up her lost left eye, though at the time, Charlie did not know that Vaggie was an Angel. In the present day, Vaggie and Charlie are a couple as well as best friends. Vaggie is supportive of Charlie as shown when she gives her the thumbs up when the former starts her speech about the Hazbin Hotel. Vaggie is also very concerned when talking to Charlie about trusting Alastor due to his reputation in the past.

Vaggie is also extremely protective of Charlie, often threatening or harming people who threaten or insult the latter. However, she can also get frustrated by Charlie's behavior as shown when Vaggie facepalmed when Charlie started singing in order to get the other demons interested in her hotel after Vaggie told her not to do so.

In "Welcome to Heaven", Charlie learns from Adam and Lute that Vaggie was once an Exorcist, which leaves her deeply distraught. After returning to Hell, Charlie becomes angry at Vaggie for not sharing her secret with her when she shared all of her own secrets with her, even wondering if everything Vaggie had said and done for her were true. She voices these fears to Rosie, who not only gets Charlie to admit she still loves Vaggie, but recognize that Vaggie truly loves her back based on her actions. This allows Charlie to forgive Vaggie and the two make up.

In "The Show Must Go On," Charlie confinds in Vaggie her fears about the upcoming battle, but Vaggie reassures her everything will be fine before the two share a loving kiss.

Husk
Husk and Charlie met when Alastor summoned Husk for a position as the hotel's bartender. While Charlie greeted Husk with open arms, Husk responded to the princess with surly indifference.

Niffty
Niffty and Charlie are co-workers at the Happy Hotel; while they have not properly interacted with each other yet, Charlie's reaction when Niffty was brought in to help run the Happy Hotel was very favorable.

Alastor
Alastor assists Charlie with her endeavors. Even though she doesn't trust Alastor as an honest sponsor, Alastor's methods of reeling in more patrons to the Hotel and his natural charisma have coerced Charlie to enlist Alastor's help. Despite this, she does keep a safe distance from striking a deal with the radio demon.

In "Dad Beat Dad", Alastor proclaimed that Charlie is like the daughter he never had. However, Vivziepop stated that she doesn't know how authentically fatherly Alastor is, as in the episode he wanted to get under Lucifer's skin and bother him and used Lucifer's wanting a relationship with his daughter to do so.

Lucifer
Charlie is Lucifer's daughter. In the pilot, it is implied that Lucifer does not believe in his daughter's plan to rehabilitate sinners, with Charlie saying "I think Dad was right about me" when calling Lilith about her failed interview. According to Faustisse, despite having immense love for his family, Lucifer is not a good father, but he loves his daughter deeply. Nonetheless, Charlie did take his words of dealing with unscrupulous folk to heart, such as Alastor.

As shown in "Dad Beat Dad", Lucifer cares for Charlie deeply and loves her very much. Albeit, he has difficulty showing it and properly expressing his affection for her due to his other issues. Lucifer himself wishes to spend more time with Charlie and desires to feel close to his daughter as they once were when she was child, as seen where he was delighted when Charlie invited him over to her Hotel, taking it as Charlie wanting to spend more time together.

Later, Lucifer himself would show jealousy towards Alastor when the latter began showing his "deep" bond with Charlie for his support of her dreams and goals of the Hazbin Hotel. As shown, 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.

Lilith
Lilith is Charlie's mother. She supports her daughter's wishes of opening the Happy Hotel. Although, she loves her daughter dearly, it is shown that she is over-occupied with her duties as the queen of Hell and unable to answer her calls.

Charlie is shown to be more comfortable confiding with Lilith over Lucifer, as Lilith is the first person Charlie turns to via call, however Lilith has not responded to these calls for seven years.

Razzle and Dazzle
Razzle and Dazzle were given to Charlie by her father and they were made her bodyguards. They care about her very much and are very loyal towards the royal family.

Helsa von Eldritch
Helsa is Charlie's rival. The two butt heads with each other like when Charlie called her a loser during her song in the show's pilot, much to Helsa's anger and Charlie's joy.

It is also implied that their families have known each other for a long time due to a portrait in the hotel that showed Lucifer, Lilith and Charlie are standing next to Helsa and her family.

Seviathan von Eldritch
Seviathan is Helsa's brother and Charlie's ex-boyfriend. Little is known about what their relationship was like, but they would break up for unknown reasons.

Angel Dust
Angel Dust is Charlie's first patient at the Happy Hotel. They eventually became friends after the events of the pilot episode. While making fun of the hotel's failure, Angel Dust notices how his taunting upsets Charlie. Feeling bad, he stops and attempts to comfort her, but, knowing he would only make it worse, he instead walks away and leaves her alone.

When asked what his unfiltered thoughts of Charlie are, he says that her happy attitude sometimes makes him happy, however, it mostly annoys him because he thinks that Hell isn't a happy place to live in.

Despite Angel not putting in any effort to redeem himself, Charlie never gave up on him. In "Masquerade", Charlie tried to talk Angel's boss, Valentino, into cutting Angel's hours so he can stay at the hotel more, but after accidentally making everything worse Angel angrily yelled at her to leave, saying she's not helping him. Charlie felt extreme guilt for not listening to Angel and respecting his boundaries and planned to write 100 apology letters and learn about boundaries. When Angel came back with Husk, Charlie tearfully gave Angel a hug and apologized for not listening to him and when Angel forgave her and thanked her for caring about him, Charlie cried tears of joy showing that she truly cares about Angel.

Katie Killjoy
Katie dislikes Charlie for more than just a handful of reasons. Despite being the princess of Hell, Katie herself has stated that she does not care about Charlie's status and frankly looks down upon her and her dreams of rehabilitating sinners.

Charlie did try to be nice to Katie, but when Katie kept on ruthlessly making fun of her idea of the hotel, Charlie had enough and stole her pen and also called her a bitch. Even though it angered Katie enough for her to turn into her final demon form, Charlie didn't hesitate to fight back.

Tom Trench
Though the two have not interacted directly, Tom laughs at her alongside Katie but didn't rag on her idea like Katie did. He is later seen to be set on fire by Charlie during the fist fight with Katie.