Themes. In a Mars Attacks crossover with 'The Hunger Games', you could explore themes of power, survival, and rebellion. The Capitol could see the Martians as a new way to control the districts, or the districts could team up with some Martians (if possible) to overthrow the Capitol. It's about finding common themes between the two universes and building a story around them.
The lore of the Transformers must be respected. You can't just make up random rules about how Cybertron works. Make sure you understand the different factions, their goals, and the technology involved. This helps in creating a believable crossover story.
Character balance. You need to make sure that no single character from either cartoon overpowers the others in the war scenario. For example, if you cross over 'Powerpuff Girls' and 'Ben 10', you can't let Ben 10's alien forms completely dominate the fight against the Powerpuff Girls.
The lore of both universes has to be respected. The different rules about vampires, werewolves, and Blade's unique origin all need to be incorporated correctly. You can't just mix things up randomly. A good understanding of the mythology in both Blade and Underworld is essential. And also, the plot should be engaging. Maybe create a new threat that forces the characters from both worlds to interact, like a super - powerful hybrid creature that neither side can defeat alone.
Character consistency is crucial. Django has a certain set of values and a backstory that should be respected. If you're crossing over with another character, like say Indiana Jones, you need to make sure that Django's actions and reactions are in line with his personality from 'Django Unchained'.
The plot should be engaging. You can create a common enemy that only the combined powers of Gaim and the other Kamen Rider can defeat. This gives a reason for their crossover. Or you could explore a mystery that spans both of their worlds, like a strange phenomenon that is affecting both the fruit - filled world of Gaim and the high - tech world of another Kamen Rider. This way, readers will be interested in seeing how the two Riders work together to solve the problem.
One key element is staying true to the essence of the original work. If it's a Lord of the Rings fanfic, the world - building should be consistent with Tolkien's Middle - earth. Another is character development. Even if using existing characters, they should grow or change in a believable way. And the plot should be engaging. It can't be too predictable. For example, in a Sherlock Holmes fanfic, don't just copy the same mystery - solving pattern but add new twists.
Character consistency is important. If Shockwave is a character from a particular franchise, you need to keep his known traits. For the 'pregnant' aspect, think about how it impacts the character's relationships. Maybe he has to deal with different reactions from allies or enemies.
A good 'Story of Assassins Fanfiction' also needs to have a sense of mystery. There could be a shadowy figure controlling events from behind the scenes. The assassin might be on a quest to uncover who this figure is. Additionally, the relationships between characters are important. It could be the relationship between the assassin and their mentor, or a romantic relationship that complicates their life as an assassin.
Character consistency is key. You have to make sure the characters from the Blizzard games act in a way that's true to their original personalities. For example, if you're writing about Tracer from Overwatch, she should be energetic and heroic.
Characterization is key. You need to understand Marianne's free - spirited and kind nature, and the Bog King's gruff but often misunderstood personality. Make sure their actions and dialogues are in line with their original characters.