In some fanfictions, Harry Potter might be defiant towards Lucifer. He would use his Gryffindor courage to stand up to Lucifer's intimidation tactics. For example, when Lucifer tries to manipulate him, Harry would firmly say no and use his magic to create a protective shield.
Hermione would likely be very suspicious of Lucifer from the start. She'd probably be researching ways to send him back to his own realm, constantly trying to outwit him with her vast knowledge. For example, if Lucifer tried to use some of his devilish charm on her, she'd quickly see through it and counter with a well - placed spell.
Harry's Patronus charm, which is a manifestation of positive energy, could have an interesting reaction when in the presence of Lucifer. Since Lucifer is associated with the underworld and negative forces in a way, the Patronus might act as a counterbalance or even a repellent to some of the darker aspects of Lucifer's world. At the same time, Lucifer's power to see people's desires could help Harry understand the motives of his enemies better. For example, if they were facing a dark wizard who had some hidden desires that were fueling his actions, Lucifer could reveal those, and Harry could then use that knowledge to find a way to defeat the wizard using his magic.
Well, the magic in Harry Potter is more rule - based and has specific spells and incantations. Lucifer's power, on the other hand, is more about manipulation and temptation. In a crossover, Lucifer might be able to corrupt some of the magic spells, making them do the opposite of what they're supposed to. For example, a healing spell could be turned into a harming spell.
Obviously, Harry Potter would be one of the main characters. And then there would be Lucifer. Depending on the story, characters like Hermione and Ron might also play important roles as they interact with Lucifer in the wizarding world.
There could be. Fanfiction writers have a great deal of creative freedom, and they sometimes come up with really out - there ideas. But it's important to note that in the official Harry Potter series, Harry Potter is the son of James and Lily Potter. This kind of fanfiction is likely to be a very different and perhaps controversial take on the story.
Hermione Granger is a very common character. Since she is Harry's best friend, she would likely be there to help him understand and control his new superpowers. She might research in the library to find out how these powers came about and how to use them effectively. Ron Weasley is also common. He would probably be both in awe and a bit jealous of Harry's new powers at first but would still support him in the end.
They might interact as allies. For instance, Itachi's combat skills and strategic mind could help Harry in battles against Voldemort's forces. Harry, in turn, could introduce Itachi to the magic of the wizarding world, like spells that could enhance Itachi's abilities further.
Harry would likely be very suspicious of The Joker from the start. He's used to dealing with threats in his own world, and The Joker's erratic behavior would set off alarm bells. Hermione would probably try to study The Joker, looking for a logical explanation for his actions and a way to counter him. Ron, on the other hand, might be a bit more fearful at first but would still stand by his friends. They would initially approach The Joker with caution, trying to figure out if he has any magical abilities or if he's just a very strange Muggle who has found his way into their world.
She might interact with Hermione in a way that challenges Hermione's logical view of relationships. Aphrodite could introduce her to a more emotional and instinctive side of love. They could have conversations about how love is not always something that can be explained by books or logic, and this could lead to Hermione having a different perspective on her own feelings for Ron or other potential partners.
They could interact through a magical portal that connects their two worlds. For instance, Supergirl could be curious about the magic in Harry's world and visit Hogwarts. She might use her superpowers to help in a Quidditch match, like flying really fast to catch the Golden Snitch before any of the players. Harry, on the other hand, could visit Metropolis with Supergirl and be amazed by the tall buildings and advanced technology.