Well, they often bring in the Keyblade concept from Kingdom Hearts into the Harry Potter world. So, like, the characters in Harry Potter might start to discover Keyblades and learn how to use them. And the Heartless can be introduced as new dark creatures that the Hogwarts students have to face.
In many of these fanfictions, the magic systems are combined. For instance, the spells in Harry Potter can be used in conjunction with the abilities of the characters from Kingdom Hearts. Also, the characters themselves cross over. So, Sora from Kingdom Hearts could end up at Hogwarts, and he'd have to interact with Harry, Hermione, and Ron. He might teach them some of his combat skills with the Keyblade while also learning about magic wands and spells. This creates a really interesting dynamic where two very different magical worlds collide and interact in unique ways.
Some fanfictions blend the two universes by having a common enemy. For example, a powerful dark force that threatens both the Kingdom Hearts universe and the Wizarding World. This forces the characters from both to team up. They then have to share their knowledge and skills to defeat this common foe. The authors also often play with the different settings. So, we might see Hogwarts with some elements of the Kingdom Hearts worlds, like the strange doors that lead to different realms in Kingdom Hearts appearing in Hogwarts.
They often blend the two universes by having characters from Kingdom Hearts enter the Pokemon world or vice versa. For example, a character like Sora might find himself in a Pokemon region and start interacting with trainers and Pokemon. This creates a lot of interesting scenarios as the powers and abilities from Kingdom Hearts are different from those in the Pokemon world.
They blend the universes by bringing together the unique magic systems. In Kingdom Hearts, we have the Keyblade and Heartless, while Once Upon a Time has its own brand of magic like spells cast by the Evil Queen. Fanfictions often have characters from one universe encountering these elements from the other. For instance, a character from Kingdom Hearts might find themselves in the Enchanted Forest and have to deal with a magical curse.
Many fanfictions blend the two universes through the use of magic systems. They might combine the spells from Harry Potter with the powers of the demigods in Percy Jackson. For instance, a character might use a Patronus charm while also having the ability to control water like Percy. It also often involves creating new villains or threats that require the combined skills of both sets of characters to defeat. This makes for exciting and unique storylines.
In fanfiction, the two universes blend in multiple ways. The characters from Harry Potter can be put into Creepypasta - like situations. For instance, Harry might find himself in a situation where he has to face a entity that is not from the wizarding world but from a Creepypasta realm and has to use his magic in a new and untested way to survive. Also, the magic in Harry Potter can be warped to fit the spooky nature of Creepypasta. Spells could have unexpected and disturbing side - effects that are more in line with Creepypasta. The creatures in Harry Potter can also be made more menacing by borrowing elements from Creepypasta. For example, a Hippogriff could be made to look more like a nightmarish beast with Creepypasta - inspired features.
In these fanfictions, they blend by sharing certain characteristics. For example, the loyalty and camaraderie among the characters in both universes are emphasized. In Harry Potter, it's the loyalty among the students of Hogwarts and the Order of Phoenix. In Kancolle, it's the bond between the shipgirls. This common trait can be a basis for the two universes to interact, like the shipgirls and the wizards/witches working together based on mutual trust.
Well, one way is through food. Since food is a big part of both worlds. In Harry Potter, there are feasts and unique magical foods like Bertie Bott's Every Flavour Beans. Ramsay could be introduced to these and either be appalled or find ways to incorporate them into his cooking. For example, he could try to make a gourmet dish using the essence of Butterbeer.
Some fanfics blend the universes by having the characters meet. For example, they might create a situation where Percy accidentally ends up at Hogwarts or Harry somehow gets to Camp Half - Blood. This allows for a direct interaction between the two different sets of characters and magic systems.
Well, they often blend the two universes by having the characters meet. For example, Ruby could run into Percy and they start to explore each other's worlds. They might also blend the powers. Maybe Weiss could use her Glyphs while Percy uses his water powers in a combined attack against a common enemy.
Well, it often has Harry using Hitman - like skills. For example, stealth and precise attacks. In some fanfics, he might use magic to enhance these skills. Like using a silencing charm while sneaking up on an enemy, just like a hitman would use his training to be quiet.
Well, in many fanfictions, they blend the universes by having the characters meet. For example, Percy might end up in the world of 'God of War' and have to deal with Kratos. This creates an interesting dynamic as their personalities and powers are quite different.