In 'touhou crossover fanfiction', adaptation is a big theme. The Touhou characters need to adapt to the new environments of the crossover universes. Whether it's a high - tech sci - fi world or a medieval fantasy land, they have to learn new skills or use their existing ones in different ways. Additionally, mystery is often present as the characters try to figure out the secrets of the new world they've entered.
One common theme is the clash of different dueling styles. Since Yugioh and GX have their own unique styles, in crossovers, seeing how they interact is often explored.
Another theme is cultural exchange. The RWBY world has its own set of values, cultures, and technologies, and Touhou has its own very distinct world of youkai and magic. Fanfictions often show how the characters from each world learn about and adapt to the other's culture. For example, a RWBY character might be fascinated by the way magic is used in Touhou. It can be really interesting to see how they incorporate elements of each other's worlds into their own understanding. And this can also lead to some character growth as they expand their perspectives.
A plot could be that some of the Touhou characters accidentally end up in the Undertale world. They then have to find a way back home while also getting involved in the conflicts between the monsters and humans in Undertale.
One popular 'touhou crossover fanfiction' is the one that crosses over with 'Pokemon'. It's really cool to see the characters from Touhou in the Pokemon world, with unique storylines like Reimu becoming a Pokemon trainer. Another great one is the crossover with 'Final Fantasy'. The magic systems of both get intertwined in interesting ways.
The unique elements also include the mixing of the two different types of enemies. You have the grotesque and often very large enemies from Dark Souls like the demons and dragons, and then you have the more fantastical and sometimes cute enemies from Touhou. In the crossover fanfiction, seeing how the characters from each side deal with the other side's enemies is really engaging. For example, a Dark Souls knight trying to figure out how to fight a mischievous youkai from Touhou. And the way the stories play with the concepts of souls in Dark Souls and the spiritual energy in Touhou is also quite special.
Well, in Touhou Project crossover fanfiction, a cool concept is the combination of Touhou with modern-day settings like a big city. Imagine Marisa Kirisame flying her broomstick over skyscrapers. Also, crossovers with other video game worlds are great. For instance, Touhou characters in the world of Super Mario, where they might have to deal with Mario - style obstacles. It's all about mixing the familiar Touhou elements with something new and unexpected.
To write a 'Yugioh Pokemon Crossover Fanfiction', start with research. Look at existing fanfictions to see what has been done before, but don't copy. Decide on a main character or a group of characters from both franchises that will drive the story. You can introduce new rules or concepts that are specific to your crossover. For example, a new type of card game that combines Yugioh's card mechanics with Pokemon's battle system. Develop the story gradually, building up the relationships between the characters and the excitement of the crossover world.
One great 'Yugioh Pokemon Crossover Fanfiction' is 'Pokemon Duel Monsters'. It combines the unique elements of both worlds really well. The characters from Yugioh interact with Pokemon in an interesting way. For example, seeing Yugi and his friends trying to understand the Pokemon world and how the rules of Pokemon battles compare to Duel Monsters battles makes for a very engaging read.