Another theme is cultural clash. Thor comes from a different mythological background, and when he enters the world of Highschool DxD, there are often clashes and reconciliations between his Norse mythology - based values and the modern - day, Japanese - influenced world of Highschool DxD. This can lead to interesting character development and story arcs.
Themes like adventure are quite common. Picture a character from DBZ exploring the strange and exciting world of Highschool DxD, or vice versa. There's also the theme of competition. Given that both universes have strong characters, fanfictions often set up scenarios where they compete against each other. Love is also a theme in some cases, where characters from the two different universes fall in love and have to deal with the differences between their worlds.
One common theme is loss. It could be the loss of a loved one, like a friend or a family member in the context of the High School DxD world.
One common theme is power - up. Siegfried is often depicted as getting stronger or unlocking new abilities. This ties in with the overall power - fantasy aspect of the Highschool DxD universe.
A common theme is Kiba's relationships. This can be his romantic relationships, like with a female character from the series. His friendships within the group are also explored a lot. The theme of redemption is also there. Kiba might be trying to atone for something he did in the past. And his role in battles, especially his strategic thinking and combat skills, is another common theme in Highschool DxD Kiba fanfiction.
One common theme is Saji's growth as a character. Writers often explore how he develops his powers and becomes more confident in the world of Highschool DxD.
One common theme is power. In both Prototype and Highschool DxD, power plays a crucial role. Fanfictions often explore how characters from one universe would adapt to the power levels in the other. For example, a character from Prototype might find the power of the devils in Highschool DxD either overwhelming or underwhelming.
A frequent theme is the development of the main character, often Issei. In 'highschool dxd lemon fanfiction', his journey of self - discovery and growth is often accompanied by his romantic and sexual encounters. His relationships with the female characters not only shape his character but also contribute to the overall plot. The 'lemon' parts usually serve to intensify these relationships and show a more private side of the characters' interactions. Another common theme is the power struggle within the different factions of the Highschool DxD world, which can also influence the relationships and add drama to the fanfiction.
One common theme is power - up. Since Vritra is a powerful entity in the Highschool DxD universe, many fanfictions focus on the main character getting some sort of power - up related to Vritra. For example, they might inherit Vritra's strength or some of its abilities.
One common theme is her loyalty. Grayfia is known for her loyalty in the series, and fanfictions often explore this aspect further, like how she balances her loyalty to different characters or factions. Another theme is her power. Writers like to show her using her magic and skills in different situations.
One common theme is power growth. Since the Gremory family is known for their power in the highschool dxd universe, many fanfictions focus on characters within the family getting stronger. Another theme is loyalty, as the Gremorys have a strong sense of loyalty to each other and their allies.