One idea could be that they go on a secret mission together. Maybe they have to uncover a hidden magic that is causing problems in the wizarding world. Another could be that they bond over their difficult pasts, like Harry's with the Dursleys and Remus' as a werewolf. They could support each other through tough times at Hogwarts, like when dealing with the prejudice some students have towards Remus because of his condition.
Perhaps they discover an ancient prophecy that involves both of them. This prophecy could be related to the future of the wizarding world and they have to figure out what it means and how to fulfill it. They might also travel to different magical places together to find clues about the prophecy, facing various challenges along the way like dangerous spells and traps.
One idea could be that Harry and Lucius are forced to work together on a secret mission for the wizarding world. Along the way, they start to see each other in a new light and gradually form a bond. Another could be that they are both victims of a dark magic spell that makes them share emotions, leading to an unexpected connection. Maybe they discover a long - lost prophecy that ties their fates together and they must figure out how to fulfill it while dealing with their initial animosity.
One idea could be that Harry and Percy meet during a magical convergence. They realize they can combine their powers to fight a new, powerful dark force that threatens both the wizarding world and the world of the Greek gods. For example, Percy could use his water powers to put out a magical fire created by a dark wizard, while Harry uses his magic to protect Percy from a monster attack.
Well, perhaps in the fanfiction, Jasper and Harry meet in a magical forest that is a sort of in - between place for different magical creatures. There, they discover a hidden prophecy that links their fates together. This prophecy could involve saving the wizarding world from a new and unknown threat that neither vampires nor wizards alone could handle. They then have to learn to trust each other and combine their powers.
One plot idea could be that they discover they are mates due to a powerful magical bond. They then have to hide this fact from the wizarding world which is in the midst of a war. Harry might try to convince Voldemort to abandon his dark ways, using their newfound connection as a way to appeal to his better nature.
One idea could be that Harry discovers a hidden magical connection to the vampire world through Alice. Maybe Alice has a premonition about Harry's role in a new, greater threat that involves both the wizarding and vampire realms. They then have to work together to figure out how to stop it.
One idea is that a dark wizard targets Remus Lupin and Sirius Black because of their close relationship with Harry Potter. The fanfiction could focus on how they protect themselves and Harry, and how this situation brings out new aspects of their magical abilities and their bond with each other. They might have to seek help from some unexpected allies within the wizarding world to survive.
One idea could be Remus traveling to a future where werewolves are fully integrated into society. He could use his knowledge from the past to help shape a better future for his kind. Another plot could involve him finding a way to cure lycanthropy in the future and having to decide whether to bring that knowledge back to his own time.
One idea could be a plot where Hermione, through some magical accident, is transported to a time when Lucius was young and they meet under different circumstances. Maybe she has to work with him to solve a mystery that could save the wizarding world in that era. This would force them to put aside their initial differences and form an unlikely bond.
Perhaps a fanfiction where an ancient spell gone wrong results in multiple characters believing they are mates with one person. This would cause jealousy, confusion, and lots of power struggles as they all vie for the attention of this one individual. For example, Damon, Stefan, and Klaus all thinking they are mated to Elena in some strange new supernatural way.
One plot idea could be that Draco and Ron are forced to work together on a secret project for Hogwarts' safety. During this time, they start to understand each other's perspectives and gradually develop feelings. Another idea is that they find themselves in an alternate magical realm where the usual wizarding world rules don't apply, and they bond over their shared confusion and the need to find a way back home. They might also start as rivals in a magical competition but end up realizing they have more in common than they thought and fall in love.