One of the most creative plots is a crossover where Inosuke enters a virtual reality game world. He doesn't understand the concept of the game at first and just starts attacking everything he sees as if it were a demon. As the story progresses, he has to learn the rules of the game world and team up with other players. It's a fun and unique take on his character as he adapts to this digital realm.
One great Inosuke Demon Slayer crossover fanfiction is the one where he crosses over with characters from another popular anime like 'My Hero Academia'. It's really interesting to see how his wild and brash personality clashes with the more civilized UA students. He could be put in a situation where he has to work with them to defeat a common enemy that combines the quirks from 'My Hero Academia' and the demons from 'Demon Slayer'.
In the Demon Slayer manga, Inosuke survives. The story doesn't have his character meet a fatal end. He plays an important role throughout and remains alive at the conclusion.
One creative plot is when Sasuke is in a crossover with the Final Fantasy universe. He becomes a part of a party of adventurers. His skills are translated into the game - like mechanics of the Final Fantasy world. For example, his Sharingan could be like a special ability that can analyze enemy weaknesses. Another is when he crosses over to the Star Wars universe. Sasuke could be a Jedi - like figure, using the Force in a way that is influenced by his ninja training. His lightsaber (if he has one) would be a unique weapon, perhaps with some ninja - style modifications.
One creative crossover could be the wizards from Harry Potter using their magic to help the Demon Slayer Corps in some way. For example, they could use spells to detect demons more easily or to create barriers to protect the villages. Another idea is having the Demon Slayers learn some basic magic from the wizards. This would give them an edge in their fight against demons. Maybe a character like Tanjiro could learn a spell to heal faster, which would be very useful in his battles.
A cool plot would involve some of the Suicide Squad members getting turned into vampires. Imagine Deadshot with vampire powers, his already excellent shooting skills enhanced by superhuman speed and strength. The Twilight characters would be divided on whether to help the Squad or destroy them. Bella could be intrigued by the 'human - like' yet different nature of the Squad members and try to understand their world.
One creative plot could be that the Knight from Hollow Knight ends up in the Underground of Undertale. The Knight's silent and determined nature could create interesting interactions with the talkative and emotional characters in Undertale. For example, when meeting Sans, the Knight's combat skills might be put to the test in a friendly spar with Sans' unique attack patterns. Another plot could involve the characters from Undertale finding their way into Hallownest. Frisk's pacifist nature might contrast with the often hostile environment of Hallownest, and they could try to find non - violent solutions to the problems there, like befriending the bugs instead of fighting them.
In some fanfictions, there's a crossover where Styx's world is merged with a post - apocalyptic one. He has to scavenge for resources in a whole new way and deal with new types of enemies. The contrast between his goblin - like abilities and the desolate post - apocalyptic landscape makes for a very creative plot. Also, the idea of him teaching his skills to the survivors in that world adds an interesting layer to the story.
Perhaps Aang meets Vegeta. Vegeta's pride and initial hostility would contrast with Aang's peaceful and friendly nature. They could end up in a battle where Aang tries to use his airbending to outmaneuver Vegeta's powerful energy blasts. This could lead to Vegeta having a new respect for the power of bending and a strange friendship could form.
One creative plot could be the characters from Kingdom Hearts finding themselves in the Resident Evil world. Sora, Donald, and Goofy might have to use their Keyblades against the zombies and bio - organic threats. They could team up with some of the Resident Evil protagonists like Leon or Jill to find a way back to their own world while also trying to stop a major outbreak.
A really creative plot is in a fanfic where the afterlife concepts from Yuy Yu Hakusho are merged with the demon hierarchy in Blue Exorcist. The story has Yusuke being sent on a mission by Koenma to help the Blue Exorcist crew deal with a demon that is trying to disrupt the balance between the human world and the demon world in a completely new way. It plays with the idea of different levels of existence and power in both universes.