A common theme is self - discovery. Ayano and Kazuma may discover new aspects of themselves through their interactions. Another is the theme of sacrifice. They might be willing to sacrifice for each other. Also, the theme of family can be present, either their own families or them creating a family - like bond. In some fanfics, they are like family to each other, supporting and protecting one another no matter what.
Well, I know a fanfic named 'Ayano and Kazuma's Promise'. In this story, they make a promise to each other under a special circumstance, and the whole story is about how they strive to keep that promise. It has some really touching moments. And then there's 'The Hidden Feelings of Ayano and Kazuma' which delves deep into their unspoken emotions for each other. There are also some fanfics that are part of a series, like 'Ayano and Kazuma: Series One' which has multiple short stories about them.
In fanfiction, Kazuma can be seen as a bit of a risk - taker. He is not afraid to try new things or go into the unknown. Ayano is usually very empathetic. She can understand the feelings of others easily. Their relationship in fanfiction is often based on mutual respect. They support each other through different adventures and challenges, with Kazuma being more action - oriented and Ayano being more of a thinker in many of the stories.
A plot could be where Kazuma and Ayano are trapped in a magical realm together. They have to rely on each other to find a way out, and during this time, their feelings intensify. They might share a first kiss in this dangerous yet romantic setting.
There are quite a few out there. For example, 'Kazuma and Ayano in the Realm of Dreams'. This fanfiction dives deep into their subconscious minds and how they interact within the dream world. It's full of symbolism and interesting interpretations of their characters. Additionally, 'Kazuma and Ayano: Partners in Time' is a great read where they are sent back in time and have to figure out how to get back to their own era while also dealing with the challenges of the past.
Often, they feature strong character development. For example, Ayano might start as a shy character and gradually become more confident in the relationship with Kyoko.
A frequent theme in shintaro x ayano fanfic is growth. Both characters might grow as individuals while also growing closer to each other. For example, Shintaro could overcome his insecurities with the help of Ayano, and Ayano could become more confident in her relationships through her bond with Shintaro. Also, themes of loyalty and trust often pop up as they rely on each other in the stories.
One common theme could be friendship evolving into something more. Maybe they start as acquaintances and gradually develop deeper feelings for each other.