Often, the theme of self - discovery is present. Both Dark and female Diasuke Niwa might be on a journey to understand their own feelings and identities more deeply. This could involve exploring their pasts, their families, and how their relationship fits into their overall lives. It might also touch on themes of sacrifice, as they may have to give up certain things for the sake of their relationship.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. They usually have a wide variety of fanfictions, and you can search for 'Dark loves female Diasuke Niwa' specifically to find relevant works.
Some common themes could be unrequited love. Since it's 'dark love', perhaps there are themes of obsession. For example, the female character might be secretly in love with Daisuke Niwa in a way that is not healthy or socially acceptable. Another theme could be internal struggle. Daisuke Niwa might be dealing with his own issues while the female's 'dark love' adds more complexity to the story.
One common theme is the exploration of forbidden love. Since Harry and the Dark Lord are on opposite sides in the original story, their love in fanfiction is often seen as something that goes against the norm. Another theme could be redemption. Maybe Harry's love is seen as a way to redeem the Dark Lord.
One common theme is the exploration of power dynamics. In these fanfictions, female characters often have to deal with the power struggles in the Naruto world in a different way than the male characters. For example, they might face more discrimination when trying to gain power or access certain jutsus.
First, focus on character development. Really understand the female character's motives for her dark love. Then, create a mood. Use descriptive language to set a dark and somewhat mysterious tone. For example, describe the settings as dimly lit or foreboding. Also, build up the relationship gradually. Don't rush into the 'dark love' part right away.
One common theme could be the struggle between different kinds of love. Since Aphrodite is the goddess of love, there might be a conflict between her love for Percy and Percy's own pre - existing relationships or loyalties. Another theme could be the power dynamics, as Aphrodite is a powerful goddess and Percy has his own powers and status in his world.
Another theme is the idea of friendship evolving into love. In many of these fanfictions, Luna and Harry start as friends within the Hogwarts community. Their shared experiences, like fighting against Voldemort, gradually turn into something more romantic. This theme gives a sense of a natural progression of their relationship.
One common theme is the 'forbidden love' aspect. Given their different ages and positions in the wizarding world (Snape as a teacher and Hermione as a student), it creates a sense of taboo. Another theme is redemption for Snape. His love for Hermione can be seen as a way to redeem himself from his past mistakes. Also, the exploration of Hermione's intelligence and how it attracts Snape is a frequent theme.
One common theme could be the clash of different magical or mutant powers. Since Harry has his wizardry from the Harry Potter world and Ororo has her mutant abilities, exploring how they interact and complement each other can be interesting. For example, how Harry's spells might work in combination with Ororo's control over the weather.
One common theme is the struggle with forbidden love. Since they are part of the same group and there are unspoken rules in their world, the idea of Thalia loving Percy goes against some norms. Another theme is sacrifice. Thalia might have to sacrifice her own feelings or desires for the greater good. And also, the theme of friendship - turned - love, as they start as friends in the original story and the fanfiction explores how that friendship can turn into something more.