A theme could be the power of love over darkness. Even though Lucifer is associated with darkness, his love might be a force that can make him question his own nature. Also, the theme of sacrifice might be present. He may have to sacrifice something dear to him for the sake of his love.
The struggle between good and evil within Lucifer because of love is a common theme. His love might make him want to be good, but his past and nature pull him towards evil. And there's also the theme of unrequited love. Maybe the object of his love doesn't return his feelings due to his reputation or actions.
Power and its consequences are also a big theme. Naruto has his own set of powers in his universe, and when combined with Lucifer - who is often depicted as extremely powerful - it explores how these powers can be used, misused, or how they change the characters. This can lead to themes of corruption or self - discovery through power.
A common theme is power struggle. Lucifer, being a powerful figure, often gets into power - related conflicts with the RWBY characters who also possess various forms of power.
One common theme is redemption. When Lucifer is hurt, it can be a starting point for him to seek redemption for his past wrongdoings.
The theme of good vs. evil is common too. Chloe, representing the good, and Lucifer, with his devilish past, come together. Fanfics often play with this dynamic, like how they influence each other's views on morality and how they navigate the world with their different natures.
Power struggles are common. When Lucifer crosses over with other universes or characters, there's often a battle for dominance, like in crossovers with other powerful supernatural beings. Each character tries to assert their power and influence.
One common theme is loyalty. Fans often explore how Lucifer and Maze stay loyal to each other despite all the challenges they face. Another theme is self - discovery. Maze, in particular, is often on a journey to find out more about herself, and this is reflected in many fanfictions. And of course, friendship is a big theme. Their unique friendship, which is full of banter and deep understanding, is a central focus in a lot of fan - created stories.
A common theme is the power struggle. Castiel is often seen as a more 'pure' angel, while Lucifer is the rebellious one. Their interactions are filled with this underlying battle for dominance or influence. Another theme is redemption. Sometimes Lucifer is portrayed as having a chance at redemption, with Castiel being a key factor in that.
Another theme is the exploration of good and evil. Since Lucifer is associated with evil in many ways, the oc's presence can either sway him towards good or they both end up in a moral gray area. It makes for really thought - provoking stories.
The theme of loyalty and betrayal can be quite common. In a 'lucifer gay fanfic', Lucifer's relationships may be tested by loyalty issues. He may have to choose between his new - found love and his own self - interests or past alliances. Additionally, the theme of acceptance, both from himself and from the world around him, can be a central theme as he embarks on a gay relationship.
Redemption is also a big one. Given Lucifer's character arc in the show, fanfiction often delves deeper into his journey of self - discovery and redemption, especially in relation to Chloe. She's like his anchor in this process. For example, in many fics, we see how he tries to be a better person because of his love for her.