One common theme is power - up. Fans like to write about how the characters, especially Issei, gain new powers and abilities. Another theme is relationship development. Since there's a harem - like situation in the original, fan fictions often explore different romantic relationships among the characters. Also, there are stories that focus on battles and rivalries between different factions like devils, angels, and fallen angels.
One common theme is power -ups. Many fanfictions explore the characters getting new powers or enhancing their existing ones. For example, Issei might gain a new form of his Boosted Gear.
One common theme is crossover battles. Writers often like to imagine how the characters from Bleach would fare against those from Highschool DxD in combat. For example, Ichigo might be pitted against Issei.
Adventure and battle themes are quite common too. Koneko is a part of the Highschool DxD world which is full of supernatural battles and adventures. Fanfictions might take her on new quests, or have her face stronger enemies, all while she tries to uphold her values and protect those she cares about. This can make for some really exciting and action - packed stories.
One common theme could be character development. In many 'High School DxD' fanfictions, characters might grow in unexpected ways compared to the original series. For example, a side character could become more powerful or gain new abilities. Another theme is relationship changes. There could be new romantic pairings or changes in the dynamics between friends and rivals. Also, power - up themes are popular. The protagonist or other characters might find new ways to increase their power levels, which often leads to exciting new storylines.
Romance is a huge theme as well. It could be between a Shinto - inspired character and one of the main characters from Highschool DxD. For example, a love story between a kitsune (a common Shinto - related creature in fanfictions) and Issei. The cultural differences between Shinto and the other elements in the story can add an interesting dynamic to the romantic relationships.
One common theme is her growth and development. Since she is a strong character in the series, fanfictions often explore how she can become even more powerful or gain new abilities. Another theme is relationships. This could be her relationships with other characters from the show, like forming new friendships or even romantic relationships.
Another theme is her growth in power. Many fanfictions explore how Asia becomes stronger and how that affects her relationships with other characters like Issei. For example, in some stories, as she gains power, she also gains more confidence and is able to stand up for herself more. It's really interesting to see how her character develops in different ways in these fan - created stories.
One common theme is power. Ophis being a very powerful character, many fanfictions explore how her power is perceived and used in different situations within the high school setting.
One common theme is family loyalty. Since the Sitri family is an important part of the Highschool DxD universe, many fanfictions explore the bonds and loyalty within the family. For example, a Sitri character might go to great lengths to protect their family's honor or secrets.
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.