You can also integrate them through shared technology or concepts. For instance, the power source in the Halo universe could be related to some meta - human power in the DC universe. This could lead to a scientific exploration in the fanfiction where characters from both universes collaborate to understand and utilize this connection.
The key is to find common ground. For example, both shows deal with the supernatural. So, a plot where a powerful supernatural entity threatens both the world of Supernatural and Mystic Falls would bring the characters together. Sam's knowledge of lore could combine with Bonnie's magic skills to fight this entity.
To integrate the characters well, start with their personalities. Mario is generally cheerful and brave, while Link is more stoic and determined. In a fanfiction, they could learn from each other. Link could teach Mario how to be more patient in combat, and Mario could show Link how to have more fun during their adventures. When it comes to the other characters, like Luigi and Zelda, they could have their own sub - plots. Luigi might be a bit intimidated by the more serious Hyrule environment at first, but then find his own way to contribute, just as Zelda could bring her wisdom to the Mushroom Kingdom.
The key is to find common ground in their abilities and personalities. For example, Captain America's sense of honor and leadership is similar to that of Obi - Wan Kenobi. They could lead a joint team in a battle. Just put characters with like - minded traits together and let their interactions unfold.
First, you need to understand the core traits of each character. For example, if you're crossing over with a character from a magical world, you might show how the Musketeers react to magic. Maybe one of them is skeptical while the others are more open - minded. Second, create a common goal. If it's a fight against a powerful villain, it gives all the characters a reason to work together. Third, let the characters learn from each other. The Musketeers can teach their sense of loyalty and honor, while the other characters can introduce new skills or ideas.
The characters can be integrated through a common case. For instance, a murder that has forensic evidence only Brennan's team can handle and a mystery - writing angle that Castle is interested in. They would meet at the crime scene and start collaborating.
One way to integrate them is through a common enemy. Maybe a new villain emerges that has powers related to both the Twilight and Flash universes. The vampires and werewolves from Twilight could team up with the Flash and his allies to fight this enemy. They would need to learn about each other's abilities and work together. For example, the Flash could use his speed to distract the enemy while the Twilight characters use their super - strength or mind - control powers to defeat it.
First, you need to decide on the main characters from both universes that you want to feature. For example, if you choose Halo's Arbiter and DC's Wonder Woman, think about how their personalities and abilities will interact. Then, come up with a plot. It could be something like a threat that endangers both the Halo and DC universes, forcing them to work together.
The characters could interact through a portal that links their two worlds. For example, Master Chief could end up in Berk and be initially seen as a strange and powerful warrior by the Vikings. Hiccup, being the curious and open - minded character he is, would be the first to approach the Chief and try to communicate. They could then start to exchange ideas about their respective worlds and threats they face.
They could interact through combat. For example, the Spartans might fight alongside the SG teams against a common foe like the Covenant or a powerful Goa'uld army. The Spartans' combat skills and advanced armor would be a great asset in the Stargate universe battles.
For starters, you can focus on their skills. For instance, the Stargate characters' knowledge of different cultures and advanced technology can be paired with the Sentinels' unique abilities like their enhanced senses. Daniel Jackson from Stargate could study Sentinel culture, while a Sentinel could use their senses to help Jack O'Neill in combat situations.