Another theme is the power dynamics. Given Lucifer's status as a fallen angel and his powers, how does his relationship with his wife (the OC) affect or change the power balance? For example, does she gain some powers through their connection? Or does she help him control his more devilish tendencies?
One interesting plot twist could be that Harry's true nature is revealed during a crucial battle. Instead of using his normal wizarding spells, he taps into his Lucifer - given powers and turns the tide in a way that no one expected. But this also makes everyone around him question who he really is.
Well, one way could be by exploring the clash of two very different magical worlds. Harry would have to deal with the expectations of the wizarding world from his Potter side and the dark, otherworldly nature of being Lucifer's son. Maybe he'd have new and strange powers that would both terrify and amaze his friends at Hogwarts.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can simply search for 'Lucifer Morningstar wife OC' in the search bar. There are often filters you can use to sort by popularity, rating, etc.
It depends on your perspective. Some see Lucifer as a complex and intriguing character, while others may have a different opinion based on their values and expectations.
Lucifer in Vertigo Comics is not straightforwardly evil. He often acts in his own self-interest and defies traditional notions of morality, but his character is much more nuanced than a simple evil label.