One common theme is the power dynamic. Alastor being a powerful demon and the reader usually being a more ordinary (by Hell's standards) character. Another is the idea of redemption. Maybe the reader tries to 'redeem' Alastor in some way. Also, there's often a theme of mystery, as Alastor has many secrets.
First, there should be conflict. Lucifer has his own motives and the angel reader has their duties. So, they might start by being at odds with each other. For example, the reader could try to stop Lucifer from causing chaos, but Lucifer might see it as the reader being naive. Then, as they interact more, they could start to understand each other's perspectives. Maybe the reader realizes that Lucifer has some valid points about the flaws in the celestial order, and Lucifer sees that the reader is not just a mindless follower. This slow shift in their views of each other can build a more realistic relationship.
In Hazbin Hotel fanfiction with Alastor x Reader, Alastor is often depicted as a complex character. He's charming yet menacing. His radio - themed appearance and mannerisms add to his allure. He's a powerful demon, and in these fanfictions, his relationship with the reader can range from a dangerous flirtation to a more protective bond.
Charlie could be a great character to pair with Lucifer. Their opposing views on the redemption of sinners in Hell can create a lot of interesting tension and storylines. Alastor is also a good choice. His power and unpredictable nature can make for some really exciting interactions with Lucifer. And then there's Vaggie. Her protective nature towards Charlie can lead to some great conflict when she has to deal with Lucifer.
One idea could be exploring Lucifer's past before the events of Hazbin Hotel. Maybe show his rise to power and the decisions that led him to become the ruler of Hell. Another could be a story where Lucifer has to deal with a new, powerful demon who challenges his authority in Hell. A third idea might be a fanfiction that focuses on Lucifer's relationships with the other main characters in a more in - depth way, like his true feelings towards Charlie and how he views her plan for the hotel.
Dialogue is key. In the fanfiction, they could have deep, heartfelt conversations about their different views on Hell, sin, and redemption. Charlie could share her hopes and dreams for the Hazbin Hotel, and Lucifer could explain his long - held beliefs about the nature of Hell and its inhabitants. This would help them bridge the gap between their perspectives.
One idea could be that Lucifer decides to test Charlie's determination to redeem sinners in a series of extreme challenges. He might create artificial situations where it seems impossible for a sinner to be redeemed, just to see if Charlie will stick to her beliefs.
One plot idea could be that the reader, an angel, is sent on a mission to redeem Lucifer. Along the way, they have many intense philosophical debates about good and evil, which gradually lead to an unexpected bond between them.
One idea could be that the characters from Hazbin Hotel end up in Paris where the Miraculous Ladybug story takes place. They could interact with Ladybug and Chat Noir, and maybe some of the chaotic energy from Hazbin Hotel causes trouble for the heroes as they try to keep the city safe. For example, Angel Dust might accidentally cause a distraction during an akuma attack.
One possible plot could be that the Doom Slayer somehow ends up in the Hazbin Hotel universe. He might initially be seen as a threat due to his violent nature. But then, they realize he could be an asset in dealing with some of the more dangerous demons in the Hazbin Hotel world. For example, he could help Charlie and her crew deal with some of the more unruly and powerful demons that are causing trouble in and around the hotel.