The theme of mentorship or friendship - turned - love is also seen. Maybe Kakashi starts as a mentor to Kushina, or they begin as friends and then feelings develop over time. Another aspect could be the exploration of their pasts. Both characters have had difficult experiences in their lives. Fanfictions might explore how these pasts shape their relationship, like how Kakashi's experiences with his team and Sensei could influence his relationship with Kushina, and how Kushina's upbringing as a Jinchuriki affects her feelings towards Kakashi.
One common theme is the exploration of their potential relationship. Since they are both characters in the Naruto universe, fanfictions often imagine how they could have interacted more if the story had been different. Another theme could be friendship, showing how they might support each other.
One common theme is family. Since they are mother and daughter, stories often focus on how they build or strengthen their family bond. Another theme is legacy. Kushina's legacy and how Naruko lives up to it or carves her own path while still being influenced by her mother.
A less common but interesting theme could be cultural exchange. Kushina has her own cultural background as an Uzumaki, and Hinata has the Hyuga clan's traditions. Fanfictions could explore how they share and learn from each other's cultures, which would add a unique dimension to their relationship in the fictional stories.
One common theme is family. Since Kushina is Naruto's mother, many fanfictions focus on them building a relationship that they were deprived of in the original story. It's about filling that void of a mother - son bond.
One common theme is mentorship. Kakashi is Naruto's teacher, and many fanfictions explore how this relationship develops over time. Another theme is friendship. As they spend more time together, their bond of friendship often becomes a central focus. Also, the theme of growth is prevalent. Naruto grows as a ninja and as a person with Kakashi's guidance.
One common theme is growth. Both characters grow in their relationship as they learn more about each other. For example, Naruto may grow in his understanding of Kakashi's past traumas, and Kakashi may grow in his admiration for Naruto's determination.
Love and friendship are common themes. The relationship between the reader and Kakashi often starts as friendship and gradually develops into love. For example, in many stories, they start by training together or going on missions as comrades.
One common theme is family. Since Kushina is Naruto's mother, the fanfictions often explore how that family bond affects Naruto's relationship with Sakura. Another theme could be growth. Both Sakura and Naruto grow as characters with Kushina's influence, either through memories or some spiritual connection.
One common theme is family bonds. Since Kushina is Naruto's mother and Mikoto is Sasuke's mother, stories might explore how they could form a unique family unit with Naruto. Another theme could be mentorship, with both Mikoto and Kushina guiding Naruto in some way.
There are some. Some fanfictions might focus on their relationship in an alternate universe where they have different interactions compared to the original Naruto storyline. You could also try Naruto fanfiction forums where fans might recommend some good ones.