Rias is another common character paired with Gasper. Since Rias is the leader of the peerage that Gasper is a part of, fanfiction might explore their relationship in terms of leadership and following. For example, how Rias helps Gasper to overcome his fears and grow as a member of the group.
A human student with latent supernatural powers could be added. This character could befriend Gasper and his harem, and their discovery of their powers could be a major plot point. They might also cause some jealousy within the harem as they get closer to Gasper.
One idea could be Gasper using his unique powers to protect his harem members from a new threat in the high school. Maybe a group of rogue devils tries to target the girls he cares about.
Power development is also a common theme. Gasper has his own set of powers, and fanfiction may delve into how he hones them. Maybe he discovers new ways to use his vampire abilities, or he trains with other characters to become stronger and more in control of his powers.
Fanfiction could also develop Gasper by exploring his relationships in more detail. His friendships, his crushes, or his mentorships. For example, if he has a mentor figure who teaches him how to better control his powers, we can see how that relationship evolves over time and how it impacts Gasper's growth as a character. We can also see how his friendships are tested in tough situations, and how he responds, which would show his loyalty and the values he holds dear.
When exploring fanfics, keep in mind the quality of writing. Look for ones with good grammar and engaging storylines. Some fanfics might focus on a particular aspect of their relationship, like how they support each other during difficult times in the Highschool DxD world, while others could be more light - hearted and focus on their daily interactions.
One great fanfic could be 'Issei and Gasper's Unlikely Bond'. It delves into how their friendship develops in a unique way, with some exciting adventures in the Highschool DxD universe. They face challenges together and support each other, which is really heart - warming.
There are probably quite a few. Some fanfic authors might be interested in exploring the unique dynamic between Gasper and Xenovia. They could be involved in various plotlines within the Highschool DxD universe, such as teaming up to fight a common enemy or having a character - growth arc together. You should check different fanfic communities and forums related to Highschool DxD to get more specific recommendations.
One possible aspect to consider in a Naruto and Highschool DxD harem fanfiction is the character interactions. For example, how Naruto's positive and determined personality might mesh with the various characters from Highschool DxD. His ninja skills could also add an interesting dynamic to the story. Maybe he could teach some of the characters self - defense or strategic thinking. Additionally, the harem element could involve Naruto forming close relationships with multiple characters from both universes, but in a non - sleazy way, perhaps based on mutual respect and shared adventures.
One popular theme could be friendship. Given their different personalities in the series, exploring how they become friends and support each other can be interesting. Another might be training together, as they both have their own powers and abilities in the Highschool DxD universe.