What are some interesting ideas for a Harry Potter x Overlord fanfiction?

One interesting crossover could be the magic systems interacting. For example, how would the spells from Harry Potter work in the world of Overlord? Maybe a 'Wingardium Leviosa' spell could be used to levitate some of the items or minions in the Overlord world. Another aspect could be the characters meeting. Imagine Harry Potter and Ainz Ooal Gown having a conversation about leadership and power, since both are in positions of power in their respective stories.

One interesting crossover could be the use of magic from the Harry Potter world in the Overlord setting. For example, a character from Overlord might gain the ability to use spells like 'Accio' to summon items, which could add a new dynamic to the power struggles in the Overlord universe. Another aspect could be the introduction of magical creatures from Harry Potter, such as Hippogriffs, into the Overlord world and how the different races in Overlord would react to them.

One idea could be that McGee discovers he has a hidden magical ability and is sent to Hogwarts. There he meets Harry Potter and they become friends. McGee could use his Muggle knowledge in unexpected ways in the wizarding world.

A possible fanfiction could involve a time - travel scenario. Tony accidentally travels back in time to the era of Harry Potter. He realizes that he can use his knowledge to prevent some of the tragedies in the wizarding world. He partners with Harry and uses his Iron Man suit's capabilities along with magic to change the course of events.

A fanfiction could revolve around a powerful demon who has been trapped in the wizarding world for centuries. Harry Potter and his friends come across this demon and find out that it holds the key to defeating a new, even greater dark force that is threatening both the wizarding and muggle worlds.

Perhaps a fanfiction where a young witch or wizard from Hogwarts has a natural affinity for Storm's powers. They could be an outcast at Hogwarts because of their different abilities. But when a great danger looms over both the magical world and the world of Storm, they are the key to bringing both sides together. Their unique combination of magic and Storm powers helps to save the day in a very unexpected way.

In 'Harry Potter x Pokemon fanfiction', an interesting concept could be the magical creatures in the Harry Potter universe interacting with Pokemon. For instance, the Hippogriffs could befriend Flying - type Pokemon, and the Centaurs could have some sort of relationship with Grass - type Pokemon. Also, the spells in Harry Potter could have an impact on Pokemon. Maybe the Stupefy spell could temporarily paralyze a Pokemon, and the Protego spell could protect against a Pokemon's attack. This would create a whole new dynamic between the two universes, and characters from both worlds would have to adapt to these new interactions.

One idea could be that Sesshomaru somehow gets transported to the Harry Potter universe. He might initially be confused by the magic there which is different from his own demonic powers. He could encounter Harry and be both intrigued and a bit disdainful, seeing Harry as a young, inexperienced wizard compared to his own powerful self. But as time passes, they might have to team up to fight a common enemy that threatens both the wizarding world and Sesshomaru's own interests.

A third idea is a time - travel based fanfiction. Elsa somehow gets sent back in time to the era of Harry Potter's parents. She uses her powers to save them from Voldemort, which changes the entire future of the wizarding world. Harry then meets Elsa in his own time, and they have to figure out how her actions in the past have altered the present and what they can do to keep the peace in this new, changed world.

One idea could be to have the characters from Harry Potter world attend the Vongola Academy in the KHR universe. They could learn about the different flames and how to use them while also sharing their magical knowledge. For example, Hermione would be really interested in the scientific aspects of the Dying Will Flames and might try to find a way to combine it with her magic.