Another common theme is the support system. Fanfictions usually show how Hinata's friends and family support her in her married life. This could be through advice, or just being there during tough times.
One common theme is the adjustment period. They come from different backgrounds, so stories often focus on how they adapt to living together. Another theme could be family acceptance, especially considering Sasuke's complex past.
A common theme is cultural differences due to their clan backgrounds. Also, there's often the theme of love against all odds. Since in the original series they don't end up together, fanfiction writers like to show how they can overcome the odds and build a loving marriage. There can also be themes related to protecting their new family and dealing with threats from the outside world.
One common theme is family. Since they are married, many fanfictions explore how they start a family, raise children, and pass on their values. For example, Naruto teaching his kids ninjutsu skills he learned.
Love and support are also big themes. In these fanfictions, Neji is usually very supportive of Hinata's decisions, like if she wants to take on a dangerous mission or start a new project in the village. And Hinata is always there for Neji, giving him emotional strength. For example, in some stories, when Neji has doubts about his role in the clan after marriage, Hinata helps him see his importance.
One common theme is family. Many fanfictions focus on how Naruto and Hinata raise their children, the values they teach them, and the family traditions they uphold. Another theme is support. Hinata is always shown as Naruto's pillar of support, especially when he has a tough time as the Hokage. Also, love and growth of their relationship is a big theme. They continue to learn more about each other and fall deeper in love as they go through life together.
Well, in hinata and madara fanfiction, the theme of discovery is quite common. Hinata discovers new aspects of the world or herself through her encounters with Madara. Another theme is the clash of ideals. Hinata's pacifist ideals might clash with Madara's more militant ones, and how they resolve this difference is often explored. There's also the theme of forbidden love in some cases. Given their different standings in the Naruto universe, a relationship between them can be seen as forbidden, and fanfictions often play with this idea in interesting ways.
One common theme is friendship. The oc often becomes Hinata's friend and they support each other. Another theme is growth. Hinata usually grows as a person through her experiences with the oc, whether it's becoming more confident or learning new skills.
One common theme is Hinata's growth. Fanfictions often explore how she develops as a ninja, both in terms of her physical abilities and her mental strength. Another theme is her relationships, especially her relationship with Naruto. Many fanfictions build on their relationship, showing different scenarios of how they interact and support each other.
One common theme is love and romance. Since their relationship is a significant part of the Naruto series, many fanfictions expand on how they fall in love and deal with the challenges that come with it.
Another common theme is the exploration of their powers in relation to each other. For example, how Hinata's Byakugan and Naruto's Nine - Tails power could be combined in some way during battles or training. Also, the theme of family and legacy, especially as they start their own family, is quite popular in these fanfictions.