A plot could involve a group of Soul Reapers coming to the Vampire Knight world to investigate reports of strange spiritual energy. They meet the Night Class and Day Class students. There could be a lot of misunderstandings at first. However, as they start to understand each other, they realize that both groups are trying to maintain a balance in their respective worlds. Some of the Soul Reapers might even start to have feelings for the vampire characters, creating a complex web of relationships.
One idea could be that Ichigo from Bleach gets transported to the Vampire Knight world. He might initially be mistaken for a threat by the vampires. But as he learns about their society, he could use his Soul Reaper powers to help protect the humans from rogue vampires. He might also form an unexpected alliance with a vampire, like Zero, who shares his sense of justice.
One idea could be that Naruto is somehow transported to the Vampire Knight world. He might initially be seen as a threat due to his unknown powers. But then he could start to form alliances with some of the vampires or the Day Class students. For example, he could team up with Zero to fight against the more evil vampires who want to harm the humans at the school. His ninja skills would be a new and exciting addition to the Vampire Knight universe.
A possible plot could involve the Hollows from Bleach somehow making their way into the Inuyasha universe. Inuyasha and his friends would have to team up with Ichigo and the Soul Reapers to fight them. This would create a really interesting dynamic as the different fighting styles and powers collide. The Hollows might also target the demons in Inuyasha's world, seeing them as a new source of power or prey.
A possible plot is a tournament - style crossover. Characters from both Naruto and Bleach are invited to a special tournament in a neutral dimension. This would lead to some really exciting match - ups like Sasuke vs. Byakuya or Naruto vs. Renji. They would fight not just for victory but also to prove the superiority of their own world's fighting styles. Along the way, they might learn from each other and form unexpected alliances.
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.
One idea could be that Naruto and Ichigo accidentally swap their powers. Naruto has to deal with the Soul Reaper powers in the Bleach world while Ichigo tries to handle chakra in the Naruto world. It would lead to some really funny and interesting situations as they both struggle to adapt to the new powers and the different cultures of each universe.
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.
One idea could be that the Gamer's ability allows them to level up their Soul Reaper powers in Bleach. For example, they could start as a weak substitute Soul Reaper and through the Gamer system, they learn skills faster, like Ichigo did, but in a more gamified way. They might see stats for their Reiatsu, sword skills, and even their Hollow powers if they have any. Another plot could involve the Gamer character getting involved in the Soul Society's politics. Since they view everything like a game, they might accidentally or intentionally disrupt the traditional power balance while trying to complete quests related to the Soul Society.
One idea could be that the Soul Reapers from Bleach are transported to the Warhammer universe. They might initially be seen as strange entities, and their spiritual powers could be both a mystery and a threat. Maybe they get involved in the battles between different factions in Warhammer, using their zanpakuto and kido to fight against the chaos forces.
A fun plot could involve the Marvel heroes visiting the Soul Society. Captain America might be intrigued by the strict hierarchical structure and the sense of honor among the Soul Reapers. Meanwhile, Spider - Man could get into all sorts of trouble exploring the different districts of the Soul Society, and his quick - wittedness would be put to the test when dealing with the various spirits and Soul Reapers.
A possible plot is that a dark force in both the Inuyasha universe (connected to Kagome) and the Vampire Knight world is trying to take over. Kagome and the main characters from Vampire Knight, like Zero and Kaname, have to work together. Kagome's knowledge of magic and spiritual energy could be combined with the vampires' powers to combat this threat. They might start off distrusting each other but gradually learn to rely on one another.