One way to blend the Mortal Kombat and Harry Potter universes in fanfiction could be through a magical portal. Imagine a portal opening between Hogwarts and the Mortal Kombat realm. Harry Potter characters could be drawn into the Mortal Kombat world and have to adapt to its brutal fighting style. They might use their magic in unique ways during the Kombat tournaments. For example, Hermione could use her vast knowledge of spells to create new combat spells inspired by Mortal Kombat moves.
Perhaps a spell gone wrong in the Harry Potter universe could open a portal to the Back to the Future universe. Hermione, being the brilliant witch she is, could team up with Marty McFly. They would have to learn about each other's worlds quickly. Hermione could teach Marty about magic, and Marty could show Hermione how to use the flux capacitor. Together, they could face challenges in both universes, like stopping Biff from taking over Hill Valley in the Back to the Future world and defeating Death Eaters in the Harry Potter world.
One way to blend the two universes in fanfiction could be through a magical accident. For example, a spell in the Harry Potter world could go wrong and open a portal to the God of War realm. This would allow characters from both to interact. Harry Potter characters might be shocked by the brutal and violent nature of the God of War world, while Kratos could be intrigued by the magic in the Potterverse.
Another aspect could be the fusion of their worlds' elements. In Mortal Kombat, there are dark and hellish realms, while Naruto has its own unique elemental chakra system. A fanfiction could explore what would happen if the dark magic from Mortal Kombat's realms seeped into the Naruto universe and affected the chakra. Maybe it could create new types of jutsu or even corrupt some of the ninja. It would be a great source of conflict and adventure in the story.
One way is to have characters from My Hero Academia attend Hogwarts. For example, Izuku Midoriya could be a new student at Hogwarts, learning magic instead of using his Quirk. His determination and growth mindset would fit well in the magical world. He could make friends with Harry Potter and his gang, and they could learn from each other. Midoriya's strategic thinking from his hero training could help in battles against Voldemort's forces, while the wizards could teach him about magic spells that might be equivalent to his Quirks in some ways.
Well, a simple way is to have a plot where the villains from both worlds team up. In this case, the Death Eaters and some of the powerful villains from My Hero Academia like All For One could form an alliance. The heroes from both universes would then have to come together to fight this combined threat. It would be interesting to see how the heroes with quirks interact with those who use magic to combat this new, powerful enemy. For instance, Bakugo might initially be dismissive of magic but then learn to respect it as he sees its power in battle.
To blend the two universes well, start with the settings. Incorporate elements from Hogwarts like the moving staircases and secret passages into Monster High. For characters, give the Monster High students some interest in wizarding magic. For example, Frankie Stein could be fascinated by the concept of transfiguration. And for the fem Harry Potter, let her be intrigued by the unique abilities of the monsters, like Clawdeen's sense of smell.
In Naruto in Overwatch fanfiction, the concept of elemental jutsu can be really interesting. Naruto's fire - style jutsu could be related to some of the fire - using heroes in Overwatch like Ashe. His water - style jutsu could be used in a creative way, like for defense or to put out fires in the Overwatch maps. And the idea of chakra could be something new to the Overwatch universe. It could be a power source that some characters start to tap into, leading to new abilities and power - ups.
To blend the two universes well, you could start by establishing some common ground. For example, both have elements of mystery and danger. You could have the magic from the Harry Potter universe interact with Slenderman's spooky abilities. Maybe Slenderman's presence distorts the magic around him in Hogwarts, causing strange things to happen. Another way is to introduce a crossover object or character that belongs to both worlds in a way.
One way to blend the Batman and Pokemon universes in fanfiction could be by having Batman encounter Pokemon in Gotham. Maybe some villain has found a way to bring Pokemon into his world and is using them for evil deeds. Batman would then have to figure out the nature of these strange creatures while also dealing with the chaos they cause.
Well, you can start by having the settings interact. For instance, the forest in 'Into the Woods' could connect to the forested areas around Forks in 'Twilight'. The characters' traits can also be combined. The vampires' elegance and strength in 'Twilight' could be paired with the cunning of some 'Into the Woods' characters like the fox. Also, the magical elements from 'Into the Woods' like spells and wishes could influence the events in the 'Twilight' universe.