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.
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.
There's also 'RWBY and Touhou: A Magical Encounter'. In this fanfiction, the magical elements of Touhou are blended really well with the world of RWBY. It shows how the RWBY characters react to the strange and powerful magic from the Touhou universe. It's a great read for those who like to see different fictional universes collide.
A common theme is the clash of different power systems. For example, when RWBY crosses over with Naruto, the semblances of RWBY characters and the chakra - based powers in Naruto create interesting dynamics. Another theme is cultural exchange. In a RWBY x Harry Potter crossover, the RWBY characters are exposed to the magical culture of the wizarding world. And adaptation to new environments is also a theme, like when RWBY characters enter the world of Attack on Titan and have to adapt to the constant threat of Titans.
Perhaps 'Touhou in the Underground: A Crossover Fanfic' would work well. It gives a sense of the Touhou characters being in the Undertale setting.
One common theme is the clash of different powers. Lycanroc has its own set of abilities from the Pokémon world, and when combined with the semblances and weapons in RWBY, it creates exciting battle scenarios. For example, Lycanroc's speed and strength might be paired with Ruby's scythe - wielding skills.
A common theme is the clash of cultures. Sasuke comes from the Naruto universe with its ninja clans and chakra system, while RWBY has its own system of Huntsmen, Huntresses, and Dust. The fanfictions often explore how Sasuke adapts to this new world and how the RWBY characters react to his different abilities and way of life.
A common theme is the clash of different powers. Sonic has his super speed and unique abilities, while the RWBY characters have their own semblances and combat skills. The fanfictions often explore how these powers interact when they meet. For example, how Sonic's speed can be used against the Grimm or in battles with RWBY villains.
A third common theme could be the exploration of different universes. The fanfictions might delve into how the Dragon Ball universe, where Broly comes from, and the RWBY universe coexist or affect each other. This can include things like different laws of physics, magic systems, and cultural differences between the two universes.
Survival is quite common. In many crossovers, Ruby is thrown into a dangerous situation in the new world. She has to use her wits and skills to survive. Whether it's a world full of demons or a high - tech dystopia, she has to find a way to stay alive. And the theme of discovery is also present. She discovers new places, cultures, and technologies in the crossover scenarios.
Another theme is the idea of friendship and teamwork. Since both Naruto and RWBY are stories that highly value these aspects, crossovers often focus on how the characters from both universes come together to form new teams and overcome challenges. In many fanfictions, fem Naruto will team up with Ruby or other RWBY characters and they'll learn to trust and rely on each other.