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.
Perhaps there could be a situation where Kikyo and Rukia meet. They are both strong, complex female characters. Kikyo could teach Rukia some of her ancient spiritual techniques, and in return, Rukia could show Kikyo the modern ways of the Soul Society. Their meeting could also lead to a deeper understanding between the two worlds, as they both have a connection to death and the afterlife in their respective universes.
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.
A cool plot could be that there's a tournament across different anime worlds, and Inuyasha and Naruto are chosen to represent their respective worlds. Along the way, they discover similarities in their pasts, like both having some form of demon - related heritage (Naruto with the Nine - Tails and Inuyasha being a half - demon). They also exchange combat techniques. Naruto teaches Inuyasha how to better use chakra control in his attacks, and Inuyasha shows Naruto some unique sword - fighting skills.
A really unique plot could be a situation where the tailed beasts in Naruto are related to the powerful demons in Inuyasha. For instance, the Nine - Tailed Fox could have a connection to a major demon in Inuyasha's world. This discovery could lead to a journey where Naruto has to travel through the Inuyasha world with Inuyasha and Kagome to find out the truth about this connection and how it can help or harm their respective worlds.
One idea could be that Inuyasha gets transported to the Ouran High School world. He'd be this wild and rough - around - the - edges character in a posh, refined school setting. Maybe he mistakes the Host Club for some sort of demon - like group at first and tries to fight them. Another plot could involve a character from Ouran getting dragged into Inuyasha's feudal Japan world and having to adapt to the lack of modern conveniences and the presence of demons.
Well, a cool plot for this crossover fanfiction could be that the Pokemon trainers are summoned to the Inuyasha world to help stop a new evil that is related to both the Pokemon world and the Inuyasha world. Maybe a villain has found a way to combine the power of the Shikon Jewel with a powerful Pokemon artifact. The trainers and their Pokemon have to work together with Inuyasha and his friends. Some Pokemon might evolve during the intense battles, and the Inuyasha characters could learn about the concept of evolution in the Pokemon world, which could be a fun aspect to explore.
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.
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 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.