First, understand the lore of both RWBY and the Beasts. This will help you create a more believable crossover. For example, know the Semblances in RWBY and the powers of the Beasts. Second, focus on character development. Show how the RWBY characters change when interacting with the Beasts and vice versa. Third, create an engaging plot. It could be a simple adventure or a more complex mystery involving both worlds.
One idea could be to have the characters from RWBY encounter the Beasts in a shared realm. For example, Ruby could be intrigued by the unique abilities of the Beasts and try to learn from them while also teaching them about her own world's Dust magic. Weiss might initially be cautious but then find common ground in the Beasts' sense of honor. Blake could relate to the Beasts' more wild and primal nature, and Yang would be eager to test her strength against them.
It's inappropriate because it combines the RWBY franchise with hentai, which goes against the family - friendly and positive image that RWBY usually promotes. Hentai content is not something that should be associated with mainstream or even most fan - created works.
A common 'rwby crossovers fanfic' is the crossover with the world of Pokémon. RWBY characters could be trainers, and their semblances could have unique interactions with Pokémon abilities. For instance, Blake's shadow clones could be used in Pokémon battles in an interesting way. These crossovers often explore how the RWBY characters would adapt to the new world they are in and how their relationships would develop within that new context.
In RWBY Naruto crossovers, often you'll find fics that focus on the training aspects. Since both series have a strong emphasis on character growth through training. Naruto's intense training regimens could be introduced to the RWBY characters, and they could learn new ways to improve their combat skills. Maybe Weiss could learn some chakra control techniques to enhance her Glyphs. Another aspect is the teamwork. The RWBY teams and Naruto's squads have different dynamics, and when combined in a fanfic, it can lead to some great character development and exciting plot twists.
The unique concept of the beast in the RWBY setting makes it interesting. RWBY already has a rich world with its own lore, and adding a new and mysterious beast can bring fresh storylines.
The main problem is the 'hentai' part. Hentai is a form of pornographic anime - inspired content. It's not suitable for a general RWBY fan base which includes people of all ages.
One interesting crossover could be the Griffins finding themselves in the world of RWBY. Maybe Stewie would be intrigued by the unique weapons and semblances. He might try to figure out how to incorporate some of those elements into his own evil plans.
One popular trope is the 'fish - out - of - water' situation. For example, a Persona character suddenly finding themselves in the RWBY world and having to adapt to the new rules, like dealing with Grimm instead of Shadows. Another is the power - exchange trope. The RWBY characters might gain the ability to summon personas, or the Persona characters could learn to use Dust. Also, the team - up trope is common. Characters from both universes joining forces to fight a greater evil, whether it's a powerful Grimm or a super - powerful Shadow.
Well, a great crossover idea in these fanfics is the concept of the characters' songs. For example, Elsa's 'Let It Go' and Belle's 'Beauty and the Beast' song. Imagine if the two stories collided and there was a moment where both characters sang their iconic songs in a combined musical number. It would be a very emotional and powerful moment. Also, the idea of the dwarfs from Snow White (since Frozen and Beauty and the Beast are both Disney) helping out in the Beast's castle could be really fun. They could add some comical relief to the more serious situations in the story.