Finally, start writing the story. Outline the plot first, like how Monika gets into the new world, what her goals are there, and how she'll achieve them. Maybe in a 'Monika in the Wonderland' crossover, she falls through a digital portal into Wonderland. Her goal could be to find a way back home, and along the way, she has to deal with the crazy characters like the Cheshire Cat and the Queen of Hearts by using her digital charm and wits.
First, decide which universe you want to cross Monika into. It could be a game, a book, or a movie world. Then, research that world thoroughly. For example, if it's a 'Monika in the Star Wars' crossover, learn about the Force, the different species, and the political systems in the Star Wars universe.
First, choose the fables you want to cross. Then, think about how the characters from each fable would interact. For example, if you choose 'The Ant and the Grasshopper' and 'The Fox and the Grapes', you might start with the grasshopper meeting the fox while looking for food. Just start writing down these initial ideas.
First, decide which world you want to cross Elsa over with. For example, if it's the world of Narnia, think about how Elsa's powers would interact with the magic of Narnia. Then, create a plot. Maybe Elsa is called to Narnia to help the Pevensie children fight the White Witch. Just start with a simple idea and build on it.
First, decide which other show or universe you want to cross over with. For example, if it's 'The Office', think about how the characters from 'Seinfeld' would fit into the Dunder Mifflin office environment. Then, come up with a basic plot idea. Maybe Jerry has to give a comedy workshop to the office employees.
First, decide which universe you want to crossover with. Then, study the lore and characters of both Twewy and the other universe. For example, if it's a crossover with Pokemon, understand how Pokemon battles work and how the Pokeballs function. Then, think of a plot that would bring the characters together in a believable way, like a strange portal opening between the two worlds.
First, decide which other universe you want to cross 'HxH' with. Then, study the lore and characters of both universes thoroughly. For example, if you choose 'My Hero Academia', know the quirks of the 'MHA' characters and how they interact with the Nen abilities in 'HxH'. Next, come up with a basic plot like a common threat that both universes need to face together.
Begin by creating an outline. Outline the main plot points, like how the characters will meet, what their initial reactions will be, and how they'll overcome their differences to fight the common foe. If you're doing a Trollhunters and 'Lord of the Rings' crossover, you might start with the Trollhunters being transported to Middle - earth. Outline how they'll interact with the hobbits, dwarves, and elves. Then, start writing your first draft, don't worry too much about making it perfect at first.
First, decide which other universe or story you want to cross the Akatsuki with. Once you've made that choice, research both the Akatsuki and the other world thoroughly. Then, come up with a basic plot idea. For example, if you're crossing with 'Harry Potter', maybe the Akatsuki are after a powerful magical artifact in Hogwarts. Next, create some initial character interactions. How would Sasori react to seeing a wizard use magic? After that, start writing your first draft, don't worry too much about making it perfect at first.
First, decide which other universe or character you want to crossover with Wolverine. Then, research both the Wolverine lore and the lore of the other element. For example, if it's a crossover with Spider - Man, learn about their powers, their backstories, and their relationships. Next, come up with a basic plot. It could be a simple 'enemies - to - allies' story or something more complex like a multi - universe threat that requires their combined efforts.
To start an 'injustice crossover fanfic', think about the central conflict. It could be a conflict of ideologies, like how different versions of Superman in the two universes view justice. Once you have that, begin by creating a hook. Maybe start with a big action scene that shows the two universes colliding in some way. Then, gradually introduce the characters and explain their relationships. Don't worry too much about grammar and style at first. Just get the ideas down on paper. As you write more, you can go back and refine the language and make the story flow better. Also, consider how the different power levels in the two universes will interact. For instance, if you have a very powerful character from one universe facing off against a group from the other, how will that play out?
First, decide which character or universe you want to crossover with Spiderman. Then, think about a central conflict or plot. For example, if it's a crossover with the Hulk, you could start with Spiderman accidentally getting caught in one of the Hulk's rampages. Then, build on how Spiderman would try to calm the Hulk down or deal with the destruction caused.