The Lucifer original story is mainly about an angel who rebels against God. In the story, Lucifer was one of the most beautiful and powerful angels in Heaven. But his pride led him to rebel. He thought he could be like God and so he led a group of angels in a revolt. As a result, he was cast out of Heaven and became Satan, the symbol of evil in many religious and mythological traditions.
The main characters in the Lucifer original story are Lucifer himself and God. Lucifer, as the rebel angel, is central to the story. His actions of pride and rebellion drive the narrative. And God, as the supreme being in the religious context, is the one who Lucifer rebels against and who ultimately punishes him for his disobedience.
Power is a major theme. Two Lucifers would bring a lot of power into one story, and it can be about who has more power or how they use their power together.
In the world of 'lucifer meets lucifer fanfiction', a common plot could involve a clash of egos. When two such powerful and complex characters meet, there's bound to be conflict. Some stories may also explore a romantic or at least a deeply emotional connection between them, as they are essentially the same being in different forms, and this connection can be both fascinating and disturbing at the same time.
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.