One common theme is growth. Both Kakashi and Sakura are characters who have room to grow, and in these fanfics, their relationship helps in that growth. Another theme is mentorship. Kakashi often acts as a mentor to Sakura, and this dynamic is explored in different ways. Also, the theme of hidden feelings is quite common. They might not show their true feelings openly at first, but as the story progresses, those feelings start to surface.
One common theme could be the exploration of a forbidden or unexpected relationship between Kakashi and Sakura. Since they have an age gap and different roles in the original story, it can create a lot of tension.
One common theme is mentorship. Kakashi is an experienced ninja, and he often takes on the role of mentoring Sakura in these fanfics. Another theme is the growth of Sakura. Through her relationship with Kakashi, she usually experiences personal and ninja - skill - related growth. For example, she might learn new jutsu or gain more confidence.
One common theme is mentorship. Since Kakashi is a more experienced ninja, there's often a theme of him mentoring Sakura, which then can develop into something more. Another is the theme of unrequited love, where either Sakura has feelings for Kakashi that she has to hide or vice versa.
Emotional connection is another prevalent theme. Some fanfics show a deeper, more personal bond between them that might not be as obvious in the original series. This could be in the form of shared secrets, or just a special understanding they have for each other.
A frequent theme is the exploration of their relationship outside of the main Naruto storyline. For example, in some fanfics, they are the main characters in a post - war world where they have to rebuild the village together. Also, the theme of mentorship turning into something more, like a romantic relationship, is quite common. Kakashi starts as Sakura's teacher but as the story progresses, their relationship deepens in a different way.
I'm not aware of the exact common themes in such fanfic as I don't promote or have in - depth knowledge of lemon - themed fanfics. However, in general, in relationship - based fanfics, themes like mutual understanding, hidden feelings, and personal growth within the relationship might be explored, but this is just speculation.
One common theme is redemption. For example, Sakura might go back in time to correct mistakes or save Kakashi from a certain fate, thus redeeming herself or others. Another theme is the exploration of their relationship. Since time travel disrupts the normal flow, it allows for a deeper look into how they feel about each other.
The theme of sacrifice is also prevalent. Given their complex situations, they may be required to sacrifice things for each other or for the greater good. This could be sacrificing their own safety, their reputations, or their relationships with others in the fan - created stories.
Another theme is the development of mutual respect. Ino is a strong kunoichi and Kakashi is a highly respected ninja. Fanfics usually show how they come to respect each other's skills and abilities more deeply as they interact. For example, Ino might learn new combat strategies from Kakashi, and Kakashi could be impressed by Ino's intelligence gathering skills.
A lot of these fanfics might have a theme of mutual understanding. Given their different personalities - Kakashi being more reserved and Anko being more fiery - they often have to learn to understand each other on a deeper level. And there could be themes of adventure as they go on missions together and how that affects their relationship. Another theme could be redemption, especially if the author decides to explore Anko's past more deeply and how Kakashi helps her in some way.