Some interesting aspects in this type of fanfiction could be the sharing of fighting styles. The acrobatic and weapon - based combat in RWBY combined with the more spiritual and energy - based combat in Bleach. For instance, a RWBY character learning to use reiatsu. And the different power hierarchies in both universes could be mashed up. How would the Espada rank compare to the power levels of the Huntsmen and Huntresses? It would be fascinating to see how the crossover would redefine the power balance.
One interesting idea could be the combination of powers. For example, the Soul Reaper's zanpakuto abilities mixed with the unique Semblances in RWBY. Maybe a character from Bleach using their Bankai in the world of RWBY and how that would interact with the Grimm. Another idea might be the character interactions. How would Ichigo get along with Ruby? Their personalities are quite different but they both have a strong sense of justice. It could lead to some really cool dialogue and development.
Well, a cool plot could involve Ichigo somehow getting transported to Remnant. He might initially be confused but then realize he has to help the RWBY teams fight against Salem. His Hollow powers could be a great asset in battles against the Grimm. And perhaps some of the RWBY characters could gain temporary Soul Reaper powers, like Yang being able to use a zanpakuto in a really brute - force way that suits her fighting style.
A more complex plot could be centered around the concept of the Soul Society in the RWBY world. What if the RWBY characters find out about the afterlife as it exists in Bleach? They might try to find a way to communicate with their fallen comrades who are in the Soul Society. This could open up a whole new dimension of character development and exploration of themes like life, death, and the afterlife.
A great 'bleach crossover fanfiction' idea is to cross it with One Piece. The Straw Hat crew could end up in the Soul Society. Luffy's carefree attitude would contrast with the more solemn Shinigami. Also, a Bleach and Fullmetal Alchemist crossover where the alchemic principles are applied in the Bleach universe would be really interesting.
One interesting idea could be a crossover of different timelines within RWBY. For example, characters from the past meet the current ones and have to deal with the differences in their worlds. Another could be a crossover of different teams in unexpected ways, like Team RWBY having to team up with a rival team to face a common enemy that is more powerful than any they've faced before. And sometimes, there are crossovers that involve alternate versions of the characters, where their personalities or abilities are slightly different, which can lead to very unique and engaging storylines.
One idea could be that Ichigo from 'Bleach' somehow gets transported to the world of 'Inuyasha'. He might meet Inuyasha and they could team up to fight a common enemy, like a powerful demon that has somehow gained the powers of Hollows from 'Bleach'. Their different fighting styles would make for an exciting combination.
One idea could be that the Pokemon trainers gain Shinigami powers. For example, Ash could discover he has the ability to purify Hollows in the Pokemon world, which are like dark or corrupted Pokemon. His Pikachu could also have a unique transformation related to this new power, like having a Zanpakuto - like form.
One idea could be a scenario where Ichigo and Naruto meet in a strange dimension. They initially misunderstand each other but then realize they have a common goal of protecting their respective worlds. They could team up to fight a new threat that somehow has the power to destroy both the Soul Society and the Hidden Leaf Village.
One idea could be that Sasuke somehow ends up in the Bleach universe and teams up with Ichigo. They could face off against a common enemy that has powers related to both the Sharingan and the Zanpakuto. For example, a villain who can manipulate souls like in Bleach but also has the ability to copy techniques like the Sharingan.
One idea could be to have Goku from DBZ end up in the Bleach universe and learn about soul reapers. He might mistake them for a new type of fighter and try to spar with them. Another could be a fusion of the power systems, like Ichigo getting the ability to go Super Saiyan on top of his existing powers.
Another plot point could be the exchange of values between the two universes. In Bleach, there are concepts like honor among Soul Reapers and the balance of souls. In RWBY, there are values such as unity and the fight for justice. When the characters interact, they can learn from each other's values. For instance, a RWBY character might be inspired by the Soul Reaper's sense of duty, and a Bleach character could be influenced by the RWBY character's emphasis on teamwork. This exchange can create a rich and engaging story without any adult content.