One common theme is love and relationships. Since it's a harem concept, there are multiple romantic interests for Naruto and Hana. Another theme is friendship, as the characters in the harem need to get along.
One common theme is friendship. Since Naruto is known for his ability to make friends, fanfictions often explore his friendship with Hana. They might go through tough times together and strengthen their bond.
One common theme is often the exploration of their relationship. Since it's fanfiction, it can go deeper into how they interact and feel about each other on an emotional and physical level.
A very common theme is cooperation. Since they are both ninjas from the same village, they often need to cooperate in fanfictions. This could be in battles against common enemies or in helping the village in some way. Another theme that pops up is the exploration of their individual skills. Naruto has his powerful jutsu and Hana has her Inuzuka clan abilities. Fanfictions may show how they combine their skills or learn from each other's abilities. There are also some fanfictions that touch on the theme of acceptance, as Naruto was an outcast in the village at first and Hana might play a role in his full acceptance by the village in these stories.
One common theme is adventure. Since both Naruto and Hana are from the Naruto universe, they often go on adventures together. Another theme is growth. Their relationship helps them grow as characters.
One common theme is the overcoming of differences. Naruto is very outgoing and Hana is a bit more introverted in most interpretations, so their relationship often involves them learning to understand and accept each other's ways.
One common theme could be the growth of their relationship, whether it's a friendship or something more. Another might be them facing challenges together.
Romance is a very common theme. Since it's about Naruto and Hana Inuzuka, many fanfictions focus on their relationship, how they fall in love and deal with their feelings.
One common theme is the exploration of an unlikely relationship. Since Naruto has his own set of relationships in the original story, this pairing is different and fanfictions often focus on how they come together. Another theme is family acceptance. Hana comes from the Inuzuka clan, so how her family reacts to her relationship with Naruto is often explored. Also, friendship - as they start from being friends and how that friendship evolves into more is a popular theme.
A common theme could be the struggle between Naruto's human side and the werewolf side if he's the werewolf. And how Hana deals with that. Another theme might be the forbidden love aspect, as their relationship might not be accepted in their world.
A frequent theme in these fanfictions is the idea of duty versus love. Naruto and Hana are often in a situation where they have to fulfill their duties to the village and their clans through this arranged marriage. But at the same time, they are trying to find real love within this forced relationship. Also, cultural differences between the Uzumaki and Inuzuka clans can be a theme. They have different traditions and ways of life, and the fanfics usually explore how they blend these differences in their marriage.