Ruby is always a great choice. In the Mirrorverse, her innocence could be twisted in an interesting way, or she could be the one to bring light to a very dark Mirrorverse. Weiss is also interesting as her family's influence might be different, and she could have a completely different set of skills or abilities. Blake could have a unique story too, perhaps her faunus heritage is more pronounced or has a different meaning in the Mirrorverse.
One idea could be exploring an alternate universe where the characters' roles are reversed. For example, the villains are the heroes and vice versa. Another plot could involve a new Grimm threat that is unique to the Mirrorverse, forcing the RWBY characters to adapt their fighting styles. Or perhaps a story about a character getting lost in the Mirrorverse and having to find their way back while facing mirror versions of their friends and foes.
I think focusing on Ruby and Weiss would be good. Ruby as the leader has so many aspects to explore, like her insecurities and how she overcomes them. Weiss, on the other hand, has her own journey of breaking free from her family's expectations. They also have a great dynamic together, which can be developed further in the fanfic. But Blake and Yang are also important, especially if you want to show their friendship and how they support each other through tough times.
I think Ruby would be really interesting. Her optimistic and fearless nature in RWBY would contrast well with the often dark and power - based world of Overlord. She could bring a sense of hope and naivete that would either endear her to the Overlord characters or make her a target. Also, her scythe - wielding skills and her use of her speed Semblance could be unique in the Overlord world.
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.
Ruby from RWBY could be a great focus. Imagine if she were to encounter the psychic abilities from Mob Psycho 100. She could learn about a different kind of power and how to incorporate it into her fighting style. Her positive and determined attitude would also make for some interesting interactions with the more reserved or complex characters from Mob Psycho 100.
Ruby would be really interesting. Her innocent and positive attitude would contrast greatly with the dark and desolate Fallout world. She'd be like a ray of hope in the wasteland. Her scythe - fighting skills would also be unique and useful against the various threats in Fallout. She might try to befriend some of the mutants or ghouls, seeing them not as just monsters but as living beings who need help.
I think Ruby would be a great choice. Her innocence and determination in RWBY could be an interesting contrast to the often more battle - hardened and power - hungry characters in Dragon Ball. She could learn a lot from them about power and also teach them about the importance of friendship and teamwork in a different way.
I think Deacon could be an interesting character for a 12 Monkeys fanfic. He has his own set of beliefs and goals that often clash with the main characters. A fanfic could explore his backstory and what led him to be the way he is. Also, the Pallid Man is quite intriguing. His appearance and his role in the events of the series give a lot of room for creativity in a fanfic. You could write about his relationship with the other villains or his own plans that we might not have fully understood in the original show.
Yes, there are many. For example, some fanfics explore the backstories of the characters, like how Ruby became a huntress. They might focus on her training at Beacon Academy, her relationships with her team members, and how she overcomes challenges. These fanfics are great because they add depth to the RWBY universe and the characters within it.
I think Beetlejuice is the top choice. He has such a unique personality, full of mischief and a desire for chaos. But also, Delia, with her new - age beliefs and her somewhat out - of - touch nature, can be really fun to explore in fanfic. You can put her in all sorts of strange situations in the Beetlejuice world and see how she reacts. Additionally, the sandworm could be an interesting focus. It's this huge, menacing creature, but there could be more to it, like a hidden gentle side or a backstory about how it came to be in the underworld.