What could happen in 'Harry Potter meets the Joker fanfiction'?

In a fanfiction scenario where Harry Potter knows the Joker, it would be a very interesting crossover. Harry, being used to a certain code of ethics in the wizarding world, might be shocked by the Joker's complete lack of moral boundaries. He could attempt to reform the Joker using magic, perhaps a spell to make him see the error of his ways. On the other hand, the Joker might see Harry as just another plaything in his game of chaos and try to break Harry's spirit.

Well, it could happen in a world where magic and the chaos of Gotham collide. Maybe Harry uses his magic to get into the Joker's mind and find the good that's left in him. He could use a spell like Legilimency to understand the Joker's past traumas and then use healing magic to start the process of redemption.

Well, in a fanfiction world, anything can be possible. Maybe Harry Potter uses his magic skills like the Killing Curse. But it's really a strange crossover. The Joker is from a completely different universe with no magic, and Harry Potter is from a world full of magic. It would be a very unique and perhaps disturbing story to see how Harry Potter overcomes the Joker's chaos and madness with his magic and finally kills him.

In such a fanfiction, perhaps Harry Potter could use magic to communicate with the aliens. For example, he might use a spell to translate their strange languages.

Well, it could be that the Queen, being a symbol of order in the Muggle world, has to deal with the sudden appearance of Harry Potter and the chaos that magic can bring. Maybe she initially mistakes his magic for some sort of advanced technology and there are a series of misunderstandings that lead to an interesting adventure. Harry could introduce her to the concept of Hogwarts and she might be fascinated by the idea of a school for magic.

Well, one possibility is that the magic from the Harry Potter world and the chakra-based abilities in Naruto could combine in interesting ways. For example, a wizard might learn to use chakra to enhance their magic spells, or a ninja could use a magic spell to give them an edge in combat. Another idea could be that the characters from both universes team up to fight a common enemy. Maybe Harry Potter and Naruto could join forces to defeat a powerful dark wizard or a rogue ninja.

Well, it could be that God appears to Harry in a moment of great despair. He might show Harry the true nature of life and death in the wizarding world. Harry could learn about the deeper meaning behind the magic he wields and how it is all part of a greater plan designed by God. God could also guide Harry on how to use his powers more morally and justly, not just for the sake of defeating the Dark Lord but also for the betterment of the entire wizarding community.

Well, perhaps Harry Potter could use his magic against Shendu's dark powers. For example, he might try to counter Shendu's spells with his own powerful incantations like Expelliarmus. It would be an epic battle of magic from two different fictional universes.

One possibility is that Medusa is somehow brought into the Hogwarts grounds. This would cause chaos among the students and teachers. Harry, being the hero he is, would step up. He might research ancient spells and potions to deal with Medusa. He could also enlist the help of his friends like Hermione, who would dig into the library to find any information about Medusa in the wizarding world's history, and Ron, who would be there for moral support and also to help in any practical ways they could come up with.

One possibility is that Harry would learn the real motives behind some of the actions of the Hogwarts teachers. Maybe Dumbledore had some other reasons for keeping certain secrets from him all along. It could also be that the truth about the relationship between different magical creatures and wizards is revealed, like why some were always seen as more dangerous than they really were.