The character designs could be a really cool part of the crossovers. The RWBY characters are known for their distinct looks, and Bloodborne has some really grotesque and fascinating creature designs. Imagine if some of the Bloodborne enemies were incorporated into RWBY's world as new types of Grimm, or if the RWBY characters got some of the more badass - looking armor from Bloodborne. The Hunts Marshal could also introduce new weapons and fighting styles that are a blend of their own and what's seen in Bloodborne. This would not only make for some visually stunning scenes but also add a new layer of complexity to the combat in the RWBY world.
Well, RWBY has its own set of myths like the origin of the Grimm and the history of the Huntsmen. Bloodborne has a complex mythology involving the Great Ones and the eldritch horrors. To blend them, we could start with the idea that the Grimm are somehow related to the eldritch horrors. Maybe the Grimm are a manifestation of the same kind of dark energy that exists in Bloodborne's world. The Huntsmen could be seen as the equivalent of the hunters in Bloodborne, fighting against these dark forces. The Hunts Marshal could be the ones who have knowledge of both mythologies and try to find a way to stop the spread of the darkness. For example, they might discover that the Dust in RWBY is a form of energy that can either be corrupted by the Bloodborne - like forces or used to fight against them.
One unique feature is the blend of different art styles. Bloodborne has a very dark, gothic, and somewhat medieval - inspired art style, while RWBY has a more modern, anime - like style. In the crossover fanfiction, these two styles can create a really interesting visual in the reader's mind when they imagine the story.
A common element is often the merging of the two distinct worlds. For example, the unique weapons from RWBY might be combined with the dark and gothic atmosphere of Bloodborne. Also, the characters' abilities could be a mix. The OC (original character) might have traits from both universes, like a RWBY character with a Bloodborne - inspired power.
There's also 'RWBY in Bloodborne's World'. This fanfiction takes the RWBY characters and drops them into the terrifying and mysterious setting of Bloodborne. It's great for those who like to see how different characters adapt to a new and dangerous environment. It often has some intense fight scenes as the RWBY girls use their skills against the nightmarish creatures of Bloodborne.
Some 'rwby bloodborne oc fanfiction' might be hard to come by. However, if you start following some RWBY or Bloodborne fan groups on social media platforms like Facebook or Twitter, you can ask the members if they know of any good ones. They might be able to point you in the right direction based on their own reading experiences.
One idea could be that the Grimm in RWBY are somehow related to the beasts in Bloodborne. Maybe there's a common origin or a dark force that controls both. For example, the Grimm could be an earlier form of the Bloodborne beasts, and the Huntsmen and Huntresses have to deal with a new type of Grimm that has the characteristics of the Bloodborne creatures, like a more sentient and intelligent type of Grimm.
Sinister characters like Adam Taurus from RWBY could also be interesting in a Bloodborne crossover. His already dark and violent nature could be enhanced in the Bloodborne setting. He could form alliances with some of the more sinister forces in Bloodborne, or perhaps he becomes a sort of anti - hero, fighting against the greater evils in the Bloodborne world while still being a morally ambiguous figure.
The Moon Presence is often a key factor in Bloodborne fanfiction. It can be seen as a source of power or a catalyst for the events that unfold. It might be the reason behind a hunter's transformation or the driving force of the dark and twisted world of Bloodborne in these fictional stories.
In Bloodborne fanfiction, the Moon Presence can be a central figure for building a dark and eerie atmosphere. Writers may describe it in different ways, like a shadowy figure lurking in the moonlit sky. It could also be used as a symbol of the unknown and the inescapable fate in the Bloodborne universe. For example, a story might show how a hunter is haunted by the presence of the Moon Presence throughout their journey.