Common themes in such fanfictions often revolve around the adaptation of characters. In a crossover, characters from different stories have to fit into the 'High School DxD' setting or vice versa. This can lead to themes of identity and self - discovery. Additionally, the 'lemon' aspect can bring in themes of passion and desire. And there's also the overarching theme of adventure, as the crossovers usually involve characters going on new adventures in the combined universes, facing new challenges and enemies together.
In 'high school dxd crossover lemon fanfiction', a frequent theme is the clash of different cultures or species. For example, if it's a crossover with a fantasy universe, you might see how the demons in 'High School DxD' interact with elves or other magical beings from the other universe. Also, the 'lemon' part sometimes means there's a focus on more romantic or sexual tension between characters, which can be a theme in itself, exploring how characters from different worlds are attracted to each other.
Transformation is also a popular theme. Given ACNologia's nature, fanfictions may involve him undergoing some sort of transformation, either physically or in his personality. This can be due to the influence of the High School DxD environment or his interactions with the characters. And this transformation can then drive the plot forward in interesting ways.
Friendship is also a big theme. Characters from both universes form new friendships and alliances. For example, Naruto's idea of comradeship might influence the characters in High School DxD and vice versa. They learn from each other's values and work together to face challenges, whether it's school - related in the High School DxD setting or something more global like in Naruto's world.
One common theme is the exploration of relationships. Given the nature of the original series, many fanfictions focus on the romantic or friendship relationships between Uri and other characters.
One common theme is power growth. Many fanfictions focus on the main character getting stronger in the High School DxD universe, whether it's through new powers or better control of existing ones.
One common theme is Asia's growth. Since she starts as a rather timid character in the original, fanfictions often focus on her becoming stronger. Another theme is her relationships, like her friendship with the main characters.
One common theme is power growth. In both Naruto and DxD, the characters are constantly striving to become stronger. Fanfictions often combine these two elements, showing how characters from one series adapt to the power - up systems of the other. For example, Naruto characters might learn about the Sacred Gears in DxD.
One common theme is the clash of different worlds. Spiderman's world of superheroics and the supernatural world of High School Dxd collide. Another could be friendship, as Spiderman might form new bonds with the characters in the High School Dxd universe.
One possible fanfiction could be about Naruto characters attending the school in High School DxD. For example, Naruto's positive and determined attitude might clash with the more complex social and power dynamics in the DxD world. He could make new friends or even rivals among the devils, angels, and fallen angels.
One possible fanfiction could be about Naruto characters somehow ending up in the world of High School DxD. Maybe Naruto's skills in combat and his determination would make him a formidable opponent in the battles that often occur in the High School DxD universe. He could form interesting alliances or rivalries with the characters there.
A fanfiction might explore how the power of the Excalibur in High School DxD would interact with Naruto's chakra. Since the Excalibur is a powerful holy weapon, it could have some interesting reactions when in the presence of Naruto's unique chakra, which is different from the magic in the High School DxD world. For example, it could either enhance or nullify certain abilities depending on how the author writes it.