One possible plot could be that Aquaman discovers a magical portal in the depths of the ocean that leads to the wizarding world of Harry Potter. He then teams up with Harry to fight a new threat that is endangering both the underwater kingdom and Hogwarts. Maybe it's a dark magic - using sea creature that has gone berserk.
Well, perhaps in this fanfiction, Aquaman gets a magical item from the wizarding world. It gives him the ability to breathe air and move on land more easily. He then enrolls at Hogwarts under a disguise to learn more about magic and ends up helping Harry Potter in his fight against Voldemort. They combine their unique skills, like Aquaman's control over sea creatures and Harry's powerful spells.
One possible plot could be that Aquaman somehow finds himself in the wizarding world of Harry Potter. Maybe a magical spell gone wrong transports him there. He could use his unique underwater abilities to help the Hogwarts students in a task related to the Black Lake, like retrieving a powerful magical artifact that has sunk to the bottom.
It could be a wizard who has gone mad with power and wants to control both the wizarding world and the underwater realm. He discovers a way to use dark magic to manipulate sea creatures and cause destruction in Aquaman's kingdom. He then sets his sights on Hogwarts as well, seeing it as another source of power.
One possible plot could be that Harry Potter discovers a magical portal that leads him to the underwater world of Aquaman. There, he has to learn the ways of the underwater society while also using his magic to help Aquaman fight against an evil force that threatens both the wizarding world and the underwater realm. Maybe a dark wizard has teamed up with a sea - based villain, and Harry's unique skills are needed to defeat them.
Well, in a Harry Potter and Aquaman crossover fanfiction, we might see Aquaman's Atlantean magic interacting with Hogwarts' magic. For instance, the Sorting Hat might have a hard time sorting an Atlantean student brought by Aquaman. Also, Harry and his friends could go on an adventure to Atlantis with Aquaman as their guide, exploring the underwater world full of strange creatures and ancient magic.
Maybe Arthur Curry is sent to Hogwarts on a mission. He has to learn magic quickly to blend in and help solve a mystery that involves dark wizards trying to steal Atlantean magic. Along the way, he befriends Harry Potter and they exchange knowledge - Arthur teaches Harry about the ocean and its secrets, while Harry shows Arthur the ropes of wizardry.
One idea could be a wizard from the Harry Potter world accidentally stumbling into Forks. Maybe he has some unique magic that the vampires in Twilight are intrigued by. For example, he could have a spell that reveals the true nature of vampires in a new way, causing chaos and new alliances.
Well, perhaps the magical creatures from the Harry Potter universe end up in the '300' setting. Dragons could be used by the Spartans to fight their enemies. The centaurs could also join the battle, lending their archery skills. And Harry could learn some combat skills from the Spartans, which he could then use back in the wizarding world to fight Voldemort's Death Eaters.
Well, it could be about Harry Potter using some Naruto - style jutsu in Hogwarts. Maybe he could learn how to do a shadow clone jutsu to help him with his studies and his adventures against Voldemort. And Naruto, if he were in the Harry Potter world, might be sorted into Gryffindor for his brave nature.
It could be Aquaman. He is so different from the wizards in the Harry Potter universe. His fish - like abilities and his role as a king would make for some great interactions with the Hogwarts students and professors. He could teach them about the ocean and its secrets, while also being amazed by the magic of wands and potions.
One idea could be that Kylo Ren somehow travels to the wizarding world. He might initially be seen as a threat due to his dark side powers, but then he discovers a connection with a Harry Potter - like character who also has a complex relationship with power. They could start to understand each other's internal struggles and form an unlikely alliance.