A cool plot could be that there is a prophecy in both the wizarding world and the underwater world of Aquaman. The prophecy speaks of a combined force of a powerful wizard and a great underwater hero. Harry Potter and Aquaman are brought together by this prophecy. They have to overcome their differences in culture and power - using styles. For example, Harry has to adapt to using his magic underwater, and Aquaman has to learn about the complex spells and potions of the wizarding world. Together, they face a common enemy that is planning to destroy both their worlds.
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.
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 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.
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 Percy Jackson, being a son of Poseidon, discovers a connection to Aquaman's underwater kingdom. Maybe there's a threat to both the demigod and Atlantean worlds, like an ancient sea monster awakened by dark magic. Percy and Aquaman have to team up, with Percy bringing his demigod skills and knowledge of Greek mythology, and Aquaman his Atlantean powers and understanding of the ocean depths. They would face challenges like underwater mazes, and magical barriers as they try to stop the monster.
A plot might involve Harry Potter being sent to the underworld on a quest. Hades mistakes him for a threat at first. But as Harry shows his courage and resourcefulness, Hades starts to respect him. They could end up working together to stop a dark force that is threatening both the wizarding world and the underworld. Harry could teach Hades some magic spells, and Hades could show Harry the hidden powers of the underworld.
One possible plot could be that Alduin somehow enters the Harry Potter universe. Maybe he is summoned by a dark wizard who wants to use his power to take over Hogwarts. Harry and his friends then have to figure out how to send Alduin back to his own realm while also dealing with the chaos the dragon has brought to the school.
One possible plot could be that Boromir somehow gets transported to the wizarding world of Harry Potter. He could be mistaken for a Muggle at first, but his warrior skills and strong sense of honor quickly earn him respect. Maybe he joins the Order of the Phoenix and uses his combat experience to fight against the Death Eaters. He might also form an unlikely friendship with Harry, learning about magic and teaching Harry about his own world's combat strategies in return.
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.
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.