The plot might involve a threat that endangers both the magical world and Atlantis. Harry Potter and his friends, along with Aquaman, have to team up. For example, an ancient dark magic has awakened and is causing the seas around the wizarding world to turn poisonous. Aquaman's knowledge of the ocean and Harry's magic skills are combined to fight this new evil.
Perhaps there's a prophecy in the wizarding world that mentions a 'great sea warrior' which turns out to be Aquaman. Voldemort or his followers want to use Aquaman's power for their own evil means. Harry and his friends have to protect Aquaman while also trying to figure out how his presence fits into the overall battle against the dark forces.
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.
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, 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.
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.
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.
Perhaps Percy is on a quest related to Poseidon and accidentally crosses paths with Aquaman. They initially have a misunderstanding, thinking the other is a threat. But then they realize they both have a common goal - to protect the seas. So they team up to stop a group of evil sea witches who are polluting the ocean and causing chaos among the sea life. Aquaman uses his trident and connection to the ocean's life, while Percy uses his sword and his wits to outsmart the witches.
It could be really interesting. Maybe Aquaman could visit Hogwarts and interact with the students. He might be amazed by the magic there, like the floating candles in the Great Hall. And perhaps he could teach the wizards about the underwater world of Atlantis, introducing them to mermaids and sea creatures they've never seen before.
Well, in a 'Harry Potter son of Aquaman' fanfiction, the story could start with Harry being an outcast at Hogwarts because of his strange connection to the ocean. As he grows older, he realizes he can control water in ways other wizards can't. This leads to him being both feared and admired. He could then go on a quest to find out more about his father Aquaman and in the process, use his combined magical and Aquaman - like powers to defeat a dark force that threatens both the wizarding world and the underwater kingdom.
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.
Well, the plot could start with fem Harry being magically transported to Aquaman's realm. Aquaman is initially suspicious of this strange being with magic, but soon realizes there is a special connection between them. They start to bond, and fem Harry learns about the underwater society and its rules. Meanwhile, there could be an evil force that wants to break their bond and use Harry's magic for its own evil purposes. So, they have to fight against this force while also strengthening their relationship as mates.
In a Harry Potter and Superman crossover fanfiction, perhaps Voldemort discovers Superman's existence and tries to use his powers for his own evil deeds. He might try to control Superman's mind. But Superman, being the strong - willed hero he is, resists. Harry and his friends then team up with Superman to fight Voldemort. They learn a lot from each other. Harry learns about physical strength beyond magic, and Superman gets to understand the complexity of magic.