You can try Archive of Our Own (AO3). It has a large collection of fanfiction from various fandoms, including lucifer x alastor. The site is well - organized, allowing you to search by tags, ratings, and word count.
One popular lucifer x alastor fanfiction might be 'The Unlikely Alliance'. It explores their complex relationship in a world full of chaos and power struggles. The story delves deep into their personalities, with Lucifer's charisma and Alastor's mysterious nature creating an interesting dynamic.
Use vivid descriptions. Describe Hell in detail, the dark corridors, the burning pits, and how Lucifer and Alastor move through this environment. When they talk, use dialogue that shows their unique voices. For instance, Lucifer might speak in a more regal tone, while Alastor's words could be laced with his sly charm. By doing these things, you can create a great Hazbin Hotel Lucifer x Alastor fanfic.
In some cases, it could be a balance. They could both be dominant in different areas. For example, Lucifer might be more dominant in matters of pure power and influence over other supernatural beings, while Alastor could be dominant in terms of making quick and shrewd decisions, so neither completely overshadows the other.
One idea could be that they form an alliance to rule over a certain realm. They combine their powers and knowledge to bring order in a chaotic land. Alastor's cunning and Lucifer's authority could make for a very interesting power dynamic.
One idea could be a story where Lucifer and Alastor have to team up to deal with a new threat to Hell. Maybe a powerful demon from another realm is trying to take over, and they have to put aside their differences. They could start off not trusting each other much, but as they face challenges together, they begin to respect one another's abilities.
Lucifer can be a good comic depending on your preferences. If you enjoy dark and mythical themes, it's likely to appeal to you. The character development is strong, and the world-building is immersive.