One popular 'khr tsuna x kyoko fanfic' could be 'Tsuna's Hidden Feelings'. In this fic, it explores the budding relationship between Tsuna and Kyoko in a really sweet way. It shows how Tsuna, who is usually shy, starts to open up to Kyoko and how their interactions gradually turn into something more than just friendship.
The plot is also crucial. It could be something like a slow - burn romance where their relationship gradually develops over time. Or it could be a story set in an alternate universe that still manages to capture the essence of their relationship. Good fanfics also have good dialogue that feels natural between the two characters.
One common theme is the development of their relationship. It often shows how they gradually fall in love, starting from their initial acquaintance. Another theme could be adventure. They might be on some kind of quest together, which deepens their bond.
Love and friendship are common themes. Since they are characters from the same series, their relationship can be explored in terms of how a friendship can turn into something more. Also, growth is a theme. For example, Tsuna might grow more confident in his relationship with Haru, and Haru might grow more independent while still being close to Tsuna.
You can try searching on some popular fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a wide range of fanfics, and you might be able to find some great tsuna x kyoko ones by using the search function and filtering for the relevant tags.
Since I don't know the specific 'tsuna and kyoko lemon fanfic', in general, lemon fanfics often contain romantic or amorous elements. It might focus on the relationship between Tsuna and Kyoko, exploring their feelings in a more in - depth way compared to the original work.
In KHR Tsuna x Hibari fanfiction, the settings can play a huge role. For example, if it's set in the school environment of Namimori, their interactions would be shaped by the school rules and the presence of other characters. Some fanfictions might explore how their relationship evolves when they face a common enemy, like the Vongola enemies. This can bring out different sides of their personalities and how they support each other in tough situations.
One common theme is friendship. The characters might go through different challenges together and strengthen their bond. For example, they could face a powerful enemy and rely on each other's skills to overcome it.
One idea could be a story where the OC is a new student at Tsuna's school. They initially clash due to misunderstandings, but as they get to know each other, they start to develop feelings. For example, the OC could be very outspoken and Tsuna is shy at first, but her boldness helps him come out of his shell.
The potential for character growth. The oc can bring out new sides of fem Tsuna, and through their adventures together, both characters can develop in unexpected ways. Maybe the oc has a different view on life or a special skill that challenges fem Tsuna to become better. And as their relationship progresses, we can see how they change and adapt to each other, which makes the fanfic a lot more interesting to read.