One way to combine Xenoblade 2 and Harry Potter in a fanfic could be to have the characters from Xenoblade 2 somehow end up in the wizarding world of Harry Potter. Maybe they could be mistaken for strange magical creatures at first. For example, the Titans in Xenoblade 2 could be seen as some sort of ancient, colossal magical beasts in the Harry Potter universe.
Another approach would be to give the Xenoblade 2 characters magical abilities similar to those in Harry Potter. Rex could be a wizard who wields his sword with the help of magic, and his Blade could have its own unique magical powers. This would create an interesting dynamic where the Xenoblade 2 story elements are blended with the magic system of Harry Potter.
Of course. It could be that the Infinity Stones were created by an ancient and extremely powerful wizard in the past of the Potter universe. In a fanfic, Harry could be the one destined to find and master the Stones. He could use the Power Stone to enhance his own magic, the Space Stone to travel instantly to different parts of the wizarding world to fight Death Eaters. The Reality Stone could be used to create illusions so powerful that they can deceive even the most powerful dark wizards. And the Soul Stone could have some connection to the Horcruxes, like a way to destroy them completely.
The spells in Harry Potter could be combined with the Thu'um of the Dragonborn. For instance, a wizard could cast a spell to enhance the power of the Dragonborn's shout. Or the Dragonborn could use his shouts to disrupt spell - casting of dark wizards.
A really creative idea could be to have the sorting hat from Harry Potter sort the characters of Xenoblade 2 into the Hogwarts houses. It would be interesting to see which house Rex would be sorted into, whether it's Gryffindor for his courage or Ravenclaw for his knowledge about the world and Blades. And then how would his relationship with his Blades change based on the house values?
One way to combine them could be in an alternate universe fanfic. Maybe Harry Potter discovers a magical aluminum alloy that has some strange properties. And She - Hulk could be brought into this world through a magical accident. For example, a spell gone wrong could transport her to the wizarding world where Harry Potter is. Then they could interact, with She - Hulk's strength and Harry's magic creating interesting scenarios. The aluminum could be part of some new magical item or contraption that they have to deal with.
One way to combine the superhero and Harry Potter universes in fanfic is through a magical accident. For example, a spell gone wrong could transport Harry Potter and his friends to a world full of superheroes. There, they might learn new powers or use their magic in unexpected ways to help the superheroes fight villains.
The wizards' magic could be combined with the hunters' combat skills. For example, Harry could use his magic to disarm or stun enemies while Sam and Dean use their physical combat and weaponry skills. The witches and wizards could also learn from the hunters about how to deal with non - magical but still very dangerous threats. Like, Hermione could study the symbols and sigils used in Supernatural to create new spells or wards.
In a fanfic, the magical and Pokemon worlds could merge due to a spell gone wrong. Alain could befriend some of the Hogwarts students and introduce them to Pokemon. The Hogwarts grounds could become a new place for Pokemon training, with spells and Pokemon abilities interacting in interesting ways. For instance, a Pokemon's electric attack might interact with a Lumos spell in an unexpected way.
The magic in 'Harry Potter' is mainly based on spells, potions, and magical artifacts. In 'Devils and Realist', there are different types of powers related to demons and the political power plays. In a fanfic, one could combine them by having a spell that can summon or control a demon from 'Devils and Realist'. For example, a powerful wizard in the 'Harry Potter' world discovers an ancient spell that links to the demon realm in 'Devils and Realist' and starts to experiment with it, but quickly realizes the danger as the demons have their own motives and power hierarchies.
A creative combination could be that the Central Perk coffee shop is secretly a wizarding hangout in the Muggle world. The Friends gang unknowingly serves magical drinks to wizards and witches in disguise. There could be a plot where the regulars at Central Perk start to notice strange things happening, like people disappearing into thin air or cups refilling themselves. And the Friends characters have to figure out what's going on with their new 'weird' customers.
The settings can also be combined. Picture a scenario where the Forbidden Forest in Hogwarts is used as a training ground by Kakashi for the students. He could set up ninja - like obstacle courses among the magical trees and dangerous creatures. This would bring a whole new dimension to the Hogwarts experience.