Well, a plot might be that Rias discovers Naruto has a special chakra that could enhance her powers. As a yandere, she decides to keep Naruto close to her at all times. Naruto, not understanding her motives at first, goes along with it. But as time passes, he realizes her true nature. This could lead to a conflict where Naruto has to decide whether to help Rias control her yandere side or find a way to break free from her clutches. It could also involve other characters from both Naruto's and Rias's worlds reacting to their strange relationship.
A common plot in Naruto Rias Fiance fanfiction is the power - up journey of Naruto. As he is now in a new environment with different power systems, he has to level up. He could gain new devil - related powers through his connection with Rias. Also, there could be a plot about their relationship development. How they overcome misunderstandings and cultural differences. For instance, Naruto's straightforward ninja way might clash with the more complex and often secretive devil society, and how they resolve these issues can be an exciting part of the story.
In some yandere simulator fanfiction, there could be a plot where the yandere character teams up with an unlikely ally. Maybe a former rival realizes the true nature of the situation and decides to help the yandere keep their senpai safe from a more dangerous threat. This can lead to some really unique character dynamics and development.
A common plot in such fanfiction is Hinata's secretive actions to be closer to Naruto. She might follow him around without his knowledge, always being there when he least expects it. For instance, Naruto could be on a solo mission and suddenly find Hinata has 'coincidentally' shown up to help. Also, Hinata could use her family's influence to be paired with Naruto on more missions, all while having her yandere tendencies bubble under the surface, like getting angry if Naruto spends too much time with mission partners other than her.
Another plot might be that Catwoman, as a yandere, tries to change Batman's identity. She thinks that his life as Bruce Wayne is what keeps him away from her fully. So, she devises plans to expose his secret identity, believing that once he's just Batman all the time, he'll be more devoted to her.
A possible fanfiction could involve Rias bringing Naruto to her underworld school as an exchange student. Naruto then shows off his ninja skills and teachings to the devils, and in return, he learns about the devils' magic and culture. This exchange leads to some hilarious and action - packed adventures.
One way is through a training arc. Naruto could teach Rias some of his chakra control techniques, which in turn could enhance her own power control. Rias could then show Naruto how to use some of her demonic abilities, like summoning minor demons for reconnaissance. Their different abilities could also create unique strategies in a fight. For instance, Naruto could create multiple clones to distract opponents while Rias sneaks up from behind using her stealth abilities. This would not only explore their abilities but also their ability to work together as a team.
A possible plot is that Makoto gradually realizes Haru's yandere nature. At first, he might be confused and a bit scared. But as he truly loves Haru, he tries to understand and help Haru overcome these tendencies. This could lead to a journey of self - discovery for both of them as they navigate their relationship.
In some plots, the yandere elements add a lot of drama to the story. For instance, there could be a love triangle within the harem where two yandere characters are vying for Harry's attention. This could lead to all sorts of magical mayhem. One might try to use a love potion on Harry while the other tries to counter it with their own magic, all while Harry is in the middle, completely oblivious to the full extent of their 'yandere' natures.
One interesting plot could be Hisoka becoming overly possessive when the reader starts getting close to another character. He might start to eliminate any potential threats in a very Hisoka - like, unpredictable way.
A plot might involve a yandere legendary Pokemon like Mewtwo falling for the reader. Mewtwo could use its psychic powers to manipulate situations so that the reader has no choice but to be with it. It might create illusions to scare away potential rivals or even control the reader's thoughts to some extent.