In fanfiction, female Mahiru often shows great courage. She is not afraid to stand up to the powerful Servamps and other dangerous foes. For instance, in many stories, she'll bravely face a Servamp who is causing trouble in the city. She also has a strong sense of justice. If she sees something wrong, she'll do whatever it takes to make it right.
In many Servamp fanfictions where Mahiru is kidnapped, it often leads to a series of intense and emotional events. His friends in the Servamp world would surely be in a panic. Kuro, for example, would likely be extremely angry and determined to rescue him. He would use his powers to track Mahiru down. Maybe he'd team up with other Servamps or their Eves to form a search party. The kidnappers could be some old enemies who want to use Mahiru as a bargaining chip against the Servamps.
One characteristic is the exploration of their contrasting personalities. Mahiru is often portrayed as more energetic and positive, while Kuro is more laid - back and mysterious. Fanfics play on this contrast to create interesting dynamics.
Well, without having read it in detail, it could be the characters. In many light novels, unique and well - developed characters are what draw readers in. If 'Mahiru Hiragi' light novel has characters with interesting personalities, complex backstories, or strong character arcs, that would make it special.
One of the main themes is sacrifice. In the story, Guren and Mahiru often have to make difficult choices that involve sacrificing something, whether it's their own well - being or their relationships. Another theme is power. They both possess certain powers and the struggle to control and use those powers in the right way is a significant part of the novels.
A common theme could be the exploration of their relationship dynamics. How they interact, support each other, and deal with the challenges that come their way.
In many Servamp Mahiru x Sakuya fanfics, the theme of redemption can be present. If Sakuya has done something wrong in the original story, the fanfic might explore his path to redemption through his relationship with Mahiru. Also, the theme of power and its control can be explored. As Servamps are related to powers, how they handle their powers in relation to each other and their relationship is something that often appears in fanfics. Another theme could be the idea of family, as the Servamp world has a complex view of relationships that can be related to the concept of family.
A common plot point is the immediate reaction of his friends. They usually go into a state of shock and then quickly shift to determination to rescue him. Another is the discovery of clues. There might be a piece of clothing left behind or a strange symbol at the kidnapping scene. Also, there could be some sort of ransom demand, which would add more complexity to the story.
Love and acceptance are also big themes. Kuro has his own insecurities and past traumas, and Mahiru's unconditional acceptance of him is a key part of their relationship. Fanfictions might expand on this, showing how their love helps Kuro heal. Additionally, the theme of power and control can be explored, as Mahiru is Kuro's master in a sense, but their relationship is much more complex than a simple master - servant dynamic.
One place to find such fanfiction could be Archive of Our Own (AO3). Just search for 'gay mahiru x kuro' on the site and you'll likely come across various stories.