Well, a cool concept is the power dynamics. In fanfiction, the Old Ones are extremely powerful entities. So, in a crossover, they could disrupt the power balance in Bloodborne. They might introduce new forms of blood magic or madness that the Hunters have never seen before. Also, the cultural clash between the two universes can be fascinating. The Old One's way of existence might be completely different from what's known in Bloodborne, leading to all sorts of interesting plot developments.
In some Bloodborne hunter crossover fanfiction, a hunter could cross over into a modern - day setting. This would lead to a clash of the archaic and the contemporary. The hunter, with their Victorian - era clothing and archaic weapons, would be a strange sight in a world of skyscrapers and cars. They might have to adapt their hunting skills to deal with modern threats like criminals or supernatural entities that exist in this new world.
One interesting concept could be the merging of the unique combat mechanics. For example, Dark Souls' methodical and strategic combat combined with Bloodborne's faster, more aggressive style. Maybe in the fanfiction, a character from Dark Souls has to adapt to the more blood - thirsty and fast - paced battles of Bloodborne's world.
One interesting concept could be the fusion of the magical elements from Miraculous Ladybug with the dark and gothic atmosphere of Bloodborne. For example, the Miraculous powers might be affected by the eldritch horrors in the Bloodborne - like world. Maybe Ladybug's Lucky Charm would take on a more sinister or complex form when used in such a dark setting.
One interesting 'bloodborne crossover fanfiction' could be the one where Bloodborne characters cross over with the world of Dark Souls. It creates an exciting new universe with different combat styles and lore combined.
Well, Gehrman, the first Hunter, would make an excellent main character in such a fanfiction. He has a deep connection to the secrets of Bloodborne. When an Old One crosses over, he would be one of the first to sense the change. His knowledge and skills could be put to the test as he tries to figure out what to do. Also, the Doll could play a significant role. She could be a mediator between the Hunter and the Old One, perhaps trying to understand the Old One's intentions and communicate them to the Hunter.
One common theme is the clash of different mythologies. For example, when Bloodborne crosses with other game universes, their respective mythologies about gods, monsters, and the afterlife collide.
One idea could be a crossover with another dark fantasy world. The Moon Presence could interact with powerful entities from that world, leading to a power struggle over the essence of the hunt. For example, if it crossed with the Witcher universe, the Moon Presence might see the Witchers as a threat to its control of the hunt in a new, shared realm.
One interesting concept could be Shreck crossing over with other fairytale characters in a modern setting. For example, Shreck meeting characters from 'Cinderella' in a bustling city. It can create humorous and unexpected interactions, like Shreck's gruff nature clashing with Cinderella's elegance.
One interesting concept could be the combination of Ben 10 000's powers with other fictional universes. For example, if he were to cross over with the DC universe, seeing how his alien forms interact with super - heroes like Superman or Batman. Maybe his Four Arms form could have an epic battle with Doomsday.
Well, a lot of fgo crossover fanfiction involves different historical periods colliding. Say, a crossover with the Roman Empire era and the modern day in the fgo world. Servants from different eras teaming up or facing off against each other can create really engaging storylines. Also, crossovers with other JRPGs like 'Final Fantasy' often bring in unique magic systems and character designs that add a whole new dimension to the fgo fanfiction.