The theme of legacy also often appears. Hinata comes from the Hyuga clan and Naruto has his own heroic legacy. Fanfics may explore how these legacies combine and influence Bolt's path. For example, Bolt might inherit certain powers or a sense of duty from both his parents, and the fanfic will show how he grapples with and grows from that.
If we consider the characters of Bolt and Hinata, perhaps themes of overcoming differences could be present. Bolt might have his own set of abilities and Hinata hers, and the fanfiction could explore how they work together or support each other. As for the 'lemon' part, if it's not about adult content but rather something symbolic like a refreshing or zesty element in their relationship, it could be about adding a bit of spice or unexpectedness to their interactions.
One common theme could be adventure. Since Bolt is often associated with action and Hinata has her own story of growth in her original series, they might embark on adventures together in fanfiction. Another could be friendship turning into something more, as is often the case in many fanfictions.
Since I'm not very familiar with this specific fanfiction pairing, it's hard to say for sure. But in general, themes could include friendship evolving into something more, characters supporting each other through difficult times, or exploring new aspects of their personalities when they are together.
Growth is another common theme. Both Naruto and Hinata grow as characters in the original series. In fanfics, their growth as individuals and as a couple is often explored. For instance, Naruto may grow in his role as a leader while Hinata grows in confidence, and these changes impact their relationship.
Another theme is self - discovery. In some fanfics, Bolt and Mittens learn more about themselves through their interactions with each other. This can lead to some really deep and meaningful storylines.
A common theme is friendship. Since they are both from the new generation of Konoha, their bond is often explored. They support each other through various challenges.
Unity is also a theme. The collar can represent the unity between Naruto and Hinata, not just in their relationship but also in their fight against common enemies. It can be a physical manifestation of their shared goals and the strength they get from each other.
Love and courage are very common themes. Hinata has always been shy, so it takes a lot of courage for her to confess her love to Naruto.
One common theme is power exploration. Since Hinata has this 'futa' aspect, it often leads to exploring new powers and abilities. Another theme is self - discovery. Hinata may go through a journey of understanding this new part of herself.
Love and relationship are very common themes. Since Naruto and Hinata end up together in the original series, fanfics often expand on their relationship, showing how they grow closer and support each other.