Lucifer Morningstar/Relationships

Charlie Morningstar
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 care for Charlie deeply and loves her very much. Albeit, he has difficulty showing it and properly expressing his effection for his daughter properly 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 to talk with him to help her get in contact with heaven, 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 for her dreams and goals using the Hazbin Hotel to redeem sinners and allow them into Heaven. As shown, Lucifer was obviously threatened of 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 increasinly insecure of his father-daughter bond with her and began to fight with Alastor to get Charlie’s attention.

Lilith
Lilith is the Queen of Hell, married to Lucifer. According to Faustisse, Lucifer and Lilith are absolutely in love with each other. Though little is known about their actual relationship outside of being married.

Razzle and Dazzle
Razzle and Dazzle were gifted to Charlie by Lucifer during her childhood to act as her personal bodyguards. Razzle and Dazzle are protective of Charlie and the rest of her family.

Alastor
According to Vivziepop, if the two were to meet, Alastor would kind of like him. In one of Viv's streams, Viv mentioned Alastor would like Willy Wonka because he's a jerk, and then she said that Lucifer has a lot in common with Willy. More than that, Vivziepop and Dave said that Alastor in no way would be afraid of Lucifer. Though, Lucifer may be an intimidating character, there's mutual respect going on between them.

Mammon
Mammon considers Lucifier as his "friend". Though little is known whether or not Lucifer affirms this friendship with Mammon.