There are various mind control stories in High School DxD. One aspect could be the power dynamics among the characters. For example, some devils might use their powers to influence others' minds in battles or for strategic purposes. It adds an interesting layer to the complex relationships in the series.
One of my favorite mind control stories in High School DxD is when Issei has to face an enemy who tries to mind control his friends. It shows his determination to protect them.
In a Naruto and High School DxD fanfiction, there could be a scenario where the protagonists of both stories meet in a neutral dimension. Issei from High School DxD might be intrigued by Naruto's ninja skills and determination. Naruto, in turn, could be curious about Issei's Sacred Gear. They could start training together, sharing their knowledge and skills, and ultimately have to face a common enemy that threatens both their worlds.
One interesting high school dxd fanfiction could be those that explore different character relationships in more depth. For example, a story might focus on the friendship between Issei and Kiba, showing their adventures outside of the main plot's battles. Another could be a fanfiction where Rias has to deal with a new kind of threat that forces her to use her leadership skills in a completely different way. There are also fanfictions that give side characters more backstory, like how Akeno came to be part of Rias' peerage.
Well, there are many interesting plots. For example, the character development of Issei and his interactions with the various devil girls. It shows how he grows from an ordinary guy to a more confident and powerful character within the short story arcs.
Yes, there are some. You can find them on various fanfiction websites. However, the quality may vary greatly. Some might focus on the unique power dynamics and relationships within the High School DxD universe in a creative vore - related way.