What could be an interesting plot for a 'Harry Potter meets Samurai Jack' fanfiction?

Well, perhaps in this fanfiction, Laughing Jack somehow finds his way into Hogwarts. He starts causing chaos in the school, like making the staircases move erratically or turning the portraits into creepy, distorted versions of themselves. Harry Potter then has to figure out a way to stop Laughing Jack without using dark magic. He might seek help from Dumbledore and use his knowledge of both the wizarding world and his own courage to face this new threat.

Well, it could be that Jack Frost accidentally ends up in the wizarding world. Maybe he freezes some of the Hogwarts grounds and Harry and his friends have to figure out how to unfreeze it without magic harming Jack.

It could be Aku. Since he is the main villain in Samurai Jack's world, his power and evil nature would make him a great antagonist. He could see Harry's magic as a threat and try to eliminate him. And if he teams up with some of the dark forces from the Harry Potter universe like Voldemort or the Death Eaters, it would be even more challenging for Harry and Jack.

Well, it could be that there's a strange rift that opens between the Naruto universe and Samurai Jack's universe. Samurai Jack accidentally falls through this rift into Naruto's world. Jack is amazed by the ninja skills and the concept of chakra. Naruto, being the curious and friendly guy he is, decides to help Jack get back home. In the process, they train together. Jack teaches Naruto some of his samurai discipline and Naruto shows Jack how to use chakra for things like climbing walls. Then they figure out a way to close the rift and Jack returns home, but with new skills and knowledge to use against Aku.

Perhaps the plot could start with Naruto finding an old, tattered scroll that shows the adventures of Samurai Jack. Naruto becomes obsessed with Jack's story and starts to train in a way that combines his ninja training with what he thinks Samurai Jack would do. As he progresses, he starts to have visions of Jack's world. Eventually, he finds a way to cross over. In Jack's world, Naruto uses his ninjutsu in creative ways to help Jack in his fight against Aku. In return, Jack teaches Naruto the art of the samurai, and Naruto brings these new skills back to his own world to face his enemies in a different way.

One possible plot could be that Harry Potter, during one of his adventures in the Forbidden Forest, stumbles upon a magical portal that transports him to the world where Byakko exists. Byakko, being a powerful and mysterious creature, initially sees Harry as a threat. But as Harry shows his kind heart and magical abilities, they form an unlikely alliance. They could team up to fight a common enemy, perhaps a dark wizard who has also found his way into Byakko's world and is causing chaos there.

Maybe Voldemort has some sort of connection to a powerful criminal in Spiderman's world. Harry and Spiderman team up to stop Voldemort from getting his hands on some high - tech weaponry from Spiderman's universe. Spiderman teaches Harry some of his combat moves, and Harry shows Spiderman some basic spells.

Maybe in the fanfiction, Harry accidentally enters a parallel dimension where Lily is still alive. Here, Lily discovers that Harry is her future son. She might take him under her wing and train him in a different way of magic, one that was perhaps forgotten in Harry's own time. This could lead to Harry having unique powers and a different approach to dealing with the Dark Arts and his enemies.

A plot could involve Sherlock being a wizard all along but not realizing it until he meets Harry Potter. He has been using his logical mind to do what he thought was normal detective work, but it was actually his latent magic powers at play. Together, they could solve crimes in both the Muggle and wizarding worlds, using Sherlock's methods and Harry's knowledge of magic spells and potions.

One possible plot could be that the magical creatures in the Harry Potter world start to show up in Forks. For example, a hippogriff might fly over the forest near Bella's house, causing chaos among the vampires and werewolves. The wizards from Hogwarts could come to investigate these strange new creatures that seem to have a different kind of magic than what they're used to. Harry, Hermione, and Ron could find themselves in the middle of the vampire - werewolf feud, trying to figure out how to keep the peace and also protect the muggles in Forks from getting too involved in this new magical mess.