One interesting plot twist could be when a Splatoon character suddenly gains Naruto - like powers. Imagine an Inkling being able to use the Rasengan. It completely changes the dynamic of the story.
Well, I've heard of some naruto and splatoon fanfiction where Naruto characters end up in the Splatoon world and have to adapt to the ink - based battles. One interesting one I remember had Naruto using his shadow clones in really unique ways during Splatoon - style turf wars. Another one had characters from Splatoon learning ninjutsu from the Naruto characters. You can find these on Archive of Our Own as well by simply typing in the relevant keywords.
It's hard to say it's a widely 'popular' genre in the traditional sense. While there may be some fans who explore such themes in fanfiction, it's not something that represents the mainstream of Splatoon fan works. The Splatoon series is mainly known for its unique gameplay and colorful characters, and most fanfiction focuses on things like character relationships, adventures in the Splatoon world, and interpretations of the game's lore. However, in the vast realm of fan-created content, there will always be a small subset of more niche or out - of - the - ordinary concepts like this.
If Naruto was in the Splatoon world, his Shadow Clone Jutsu could be used in interesting ways. He could send clones to cover more ground during an ink battle, confusing the enemy. And for the Inkling's part, their ability to swim in ink could help Naruto move around in ink - filled areas more easily. They could also use their ink guns to provide cover for Naruto while he attacks up close.
One idea could be that Naruto characters are transported into the Splatoon world. They might initially be confused by the ink-based battles and the unique species. For example, Naruto could mistake an Inkling for a strange ninja from another land and challenge them to a friendly spar, only to find out about the ink shooting mechanism. Another plot could involve the Akatsuki from Naruto trying to steal the valuable ink resources in the Splatoon world for their own purposes. They would face off against the Splatoon heroes who are determined to protect their world's resources.
One great Splatoon Agent 3 fanfiction is 'Agent 3's New Adventure'. It takes Agent 3 on a journey to discover a new area in the Splatoon world filled with unique enemies and challenges. The story is really engaging as it shows Agent 3 using their skills in creative ways.
I'm not sure specifically as there could be many different 'Splatoon Kidnapped' fanfictions. It might be about a character in Splatoon getting kidnapped and then the story could revolve around their rescue, the motives of the kidnapper, or how the kidnapped character's friends deal with the situation.
Once upon a time, Mario found himself in the world of Splatoon. He was confused at first, looking at all the inklings and octolings. But being the brave hero he is, he decided to join in the Turf War. He jumped around, using his plumber skills to dodge the ink blasts. Mario's red cap stood out in the colorful ink - covered battlefield. He soon made friends with some inklings who taught him how to use the ink guns. Together, they fought against a group of octolings and won the Turf War. It was a strange but exciting adventure for Mario.
One common theme is friendship. Inklings and Octolings forming strong bonds while competing in battles. Another is exploration, like exploring new areas in the Splatlands.
One possible role for humans in Splatoon fanfiction is that of time - travelers. They could come from a future or past where the Splatoon world is either very different or not yet discovered. They might accidentally stumble into the Splatoon universe and have to adapt to its rules. Their presence could also disrupt the balance in the Splatoon world, leading to interesting plot developments.