One common theme could be the exploration of unique power dynamics. Since Highschool DxD has a complex system of powers, in futanari fanfiction, it might show how these characters with different genders and powers interact. For example, a futanari character might have a special power that affects the relationships and battles within the story.
Love and relationships are always popular. In this type of fanfiction, it could involve unorthodox relationships. A futanari character might fall in love with a character from the original Highschool DxD series in a way that challenges the norms of the show's universe, adding an interesting twist to the love story.
One popular theme is the exploration of relationships between female characters. In Yuri Highschool DxD fanfiction, writers often focus on the emotional bonds and interactions between the female characters. Another theme could be the development of unique powers or abilities within the Yuri context of the story. For example, a character might discover a new power that is related to her relationships or her own self - discovery. Also, the theme of friendship and loyalty among the female characters is quite common. They support each other through various challenges in the high school setting, which is full of supernatural elements in the Highschool DxD universe.
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.
One popular theme is power - ups. In both Highschool DxD and Campione, power is a significant aspect. Fanfictions often explore characters getting new and stronger powers, and how they use them. For example, in Highschool DxD, a fanfic might focus on Issei getting a new form of his Boosted Gear.
One popular theme is the relationship development between the female characters. It could be about how they gradually fall in love, overcome obstacles in their relationship, like dealing with the opinions of other characters in the Highschool DxD world.
For Naruto fanfiction, redemption arcs for villains can be a popular theme. Writers might explore how characters like Sasuke could have a different path to redemption. Another theme is time - travel, where characters go back in time to change events. In Highschool DxD fanfiction, exploring the backstories of the devil characters more deeply is a theme. Also, crossovers between Highschool DxD and other anime are becoming more popular, like a crossover with Bleach or One Piece.
One popular theme is adventure. Yasaka could be on a journey to protect her territory or find a powerful relic. Another theme is friendship. She might form new alliances with other characters from the Highschool DxD universe. And of course, there's the theme of power - how she gains or uses her power in different situations.
Another popular theme is alternate relationships. The multiverse allows for different pairings between characters that might not be possible in the original story. It gives a fresh perspective on the characters' personalities and how they interact with others.
A common theme is power - up. Rias may gain new powers or improve her existing ones. This could be related to her devil heritage or through some special training or encounter.
Some popular themes in Issei and Kuroka fanfiction could be adventure. They might go on quests together in the supernatural world of Highschool DxD. Another theme could be relationship development, like how they gradually fall in love and overcome the differences between a human - turned - devil like Issei and a nekomata like Kuroka.
Power - up themes are also common. Since Issei has his own power progression in the original series, fanfictions might explore how he and Asia grow in power together. Maybe they train together or discover new abilities as a team. And of course, there are the slice - of - life themes. These stories show their daily lives at school or in the supernatural world, dealing with normal and not - so - normal problems.