Many fanfictions in this category also explore the theme of adaptation. The characters from Sailor Moon have to adapt to the more risqué and demon - filled world of High School DxD, and vice versa. This adaptation process can lead to some really interesting character arcs as they learn to deal with new cultures, values, and threats.
Friendship is also a big theme. Characters from both series might form new friendships or strengthen existing ones. They could support each other in battles or in dealing with the challenges of living in a new and different world. For instance, the Sailor Scouts could befriend some of the students in the High School DxD world and help them out in times of need.
One popular 'Sailor Moon High School DxD' fanfiction might be those that explore the crossovers in a more comical way. For example, some fanfics could have the characters from Sailor Moon accidentally end up in the High School DxD universe and deal with the different rules and powers there.
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 common theme is the combination of different magical systems. For example, mixing Sailor Moon's lunar magic with other supernatural powers like witchcraft or demon magic. Another theme is the exploration of alternate universes where Sailor Moon characters interact with a wider range of supernatural beings.
One common theme is power combination. Writers often explore how the powers of Sailor Moon characters combine with those from the other crossover universe. For example, in a Sailor Moon and Dragon Ball Z crossover, they might look at how Sailor Moon's magic could work with the energy - based attacks in Dragon Ball Z.