Well, often there is a theme of love triangles. Maybe there's a new character introduced who Sakura falls for, causing her to cheat on Naruto. Also, themes of regret and redemption might be present. Sakura might later realize her mistake and try to make amends. And sometimes, these fanfics might use this plot to show the darker side of human nature, like jealousy or insecurity.
One common theme could be the exploration of unrequited love. Maybe in these fanfictions, Naruto has hidden feelings for Hinata that he suppresses while being with Sakura. Another theme might be jealousy. Sakura could be jealous of Hinata and Naruto's connection. Also, there could be a theme of self - discovery for Naruto, realizing his true feelings for Hinata through some sort of event that makes him question his relationship with Sakura.
Well, a frequent theme is the emotional chaos that follows such an act. Sakura's decision to cheat can lead to a lot of turmoil among the three characters. There's also the theme of forbidden love in some cases. Even though Sasuke and Sakura have a connection in the original story, the way it happens in this fanfiction (through cheating) makes it a bit of a forbidden relationship. And then there's the theme of self - discovery for the characters. They have to re - evaluate who they are and what they want in the face of this new relationship dynamic.
Power and growth are also common themes. Sakura, being a strong - willed character, and the Uchiha, known for their powerful abilities, come together in these fanfics to grow stronger. They might train together or face challenges that force them to level up their skills.
Love is also a prevalent theme. There are fanfics that focus on the romantic relationships between Naruto and Hinata, as well as potential relationships between Sakura and other characters or even some new, unexpected pairings among the three of them. For example, a fanfic might explore a what - if scenario where Sakura develops feelings for Hinata in a different way than just friendship.
One common theme is the realization of long - hidden feelings. Naruto and Sakura have known each other for a long time, so in fanfics, often there's a moment where they both finally admit to their true emotions.
Well, family dynamics would be a big theme. How Sakura's family (her parents if they are in the story) and her ninja family (her teammates) react to the news. There could also be themes related to the medical aspects, as Sakura is a medic - ninja. Maybe she discovers something unique about her pregnancy due to her medical knowledge. And of course, the theme of protecting the unborn child from potential threats in the Naruto world, which is full of danger.
One common theme is growth. Both Sakura and Naruto grow as individuals and as a duo. Naruto might grow in his understanding of emotions, especially love, while Sakura could grow in her confidence. For example, they might start off as friends who are a bit awkward around each other in a romantic sense, but over time, they become more comfortable and their relationship blossoms.
One common theme could be miscommunication. Maybe Sasuke is misunderstood to be 'cheating' when in fact he's just trying to help Sakura in a way that Naruto misinterprets. Another theme could be exploring different forms of love and loyalty. It might show that even in a situation that seems like betrayal, the characters still have underlying bonds that can't be easily broken.
A common theme is unrequited love. Naruto loves Sakura, but she may not return his feelings in the same way, which can lead to his emotional hurt. Another theme is friendship strain. Their bond as friends is tested when Sakura's actions cause harm to Naruto. Also, the theme of sacrifice might be present. Sakura might sacrifice Naruto's well - being for what she believes is a greater good, causing him pain.
One of the common themes is adventure. They are ninjas after all, and many fanfics send them on various adventures, whether it's exploring new lands or uncovering secrets. Also, the theme of loyalty often comes up. Their loyalty to the Hidden Leaf Village and to each other can be a central part of the story. For example, they might have to choose between loyalty to the village and loyalty to a friend in a difficult situation in a fanfic.