Some writers combine the two universes by setting the story in a new location that has elements of both shows. Let's say a new town is created that has a prison - like facility but also has the normal civilian life aspects from 'Just Friends'. Characters from both shows are then brought there and their interactions are written about. This allows for new and interesting dynamics to be explored as the characters from different backgrounds have to co - exist and deal with each other's quirks and personalities.
Some writers create a situation where the problems in the Supernatural world are related to Hermione's world. Maybe a dark wizard has escaped into the Supernatural universe and is causing chaos. Hermione then has to team up with the Supernatural characters to stop this threat. This allows for a seamless combination of the two universes, as they both have to work towards a common goal using their respective skills and knowledge.
Character crossovers are a key way. Writers will bring characters from both universes into the same story. They might have Hermione meet Bella, and through their interactions, the two different worlds start to merge. The slash aspect can then be added by creating unique relationships between characters from the two series, like a budding romance between a wizard and a vampire. This not only combines the universes but also adds an interesting new dimension to the story.
Some fanfictions combine the two universes by having characters from both worlds meet in a neutral or new setting. For instance, a new island or city that is a melting pot of both Naruto - like ninjas and Black Lagoon - style mercenaries and criminals. Here, they interact, form alliances or rivalries, and the story unfolds with all the drama and action that comes from the clash of these two very different fictional cultures.
One great example could be a fanfiction where characters from 'Just Friends' end up in the 'Orange Is the New Black' prison setting in a really comical way. Maybe the 'Just Friends' characters have to adapt to the prison rules and make friends with the 'Orange Is the New Black' inmates.
Writers often blend the two universes' aesthetics by incorporating the dark and gritty atmosphere of 'Darker than Black' into the more superhero - centric 'Worm' world. For example, they might describe the cityscapes in 'Worm' with the same sense of foreboding and mystery as in 'Darker than Black'.
Well, one way could be through a crossover spell or some sort of interdimensional rift. Maybe a character from Twilight somehow ends up in the Naruto world and has to adapt to the ninja way of life.
Often, it combines them through crossovers. For example, a portal could open between the Naruto universe and Shinji's world, allowing characters to travel between them.
It could use a portal or some sort of magic - tech device. For example, a magical experiment in the Harry Potter world goes wrong and creates a portal to the Marvel universe where Black Widow is. Or maybe a Stark Industries experiment accidentally taps into the magic of the Harry Potter world. This would be a simple and straightforward way to bring the two together.
In many 'Master Chief RWBY' fanfics, they combine the universes by having Master Chief somehow end up in the RWBY world. This could be through a portal or some kind of interdimensional rift. Once he's there, his high - tech equipment and combat training from his own universe contrast with the more magical and combat - school - based RWBY world.
One way is through power systems. The biotics in Mass Effect and the chakra in Naruto can be related. Maybe a character in a fanfiction discovers that biotics are a form of chakra or vice versa. Also, the different races in Mass Effect and the clans in Naruto can interact in terms of politics and alliances. For instance, the Uchiha clan could form an alliance with the Salarians based on their shared intelligence and strategic thinking. And the stories can also use the different settings, like having a battle take place on a Mass Effect planet but with Naruto - style combat techniques.