One common theme is unrequited love. For example, Sakura might be in love with Sasuke while he has feelings for Naruto or vice versa. Another theme is jealousy. Characters can get jealous of the relationships between the others. And of course, the lemon part brings in themes of sexual attraction and physical relationships that are not part of the main Naruto story.
Love triangle is a very common theme. The complex relationship between Naruto, Sakura, and Sasuke, with Sakura's initial love for Sasuke and Naruto's unrequited love for Sakura, often forms the basis of many fanfictions. It creates a lot of drama and emotional tension.
One common theme is redemption. Sasuke has a complex past, and many fanfictions explore his journey towards redemption and how Sakura and Naruto play a part in it. For example, in some stories, Sasuke has to make amends for his actions in the past and regain the trust of his friends.
Friendship is also a big theme. The deep bond between Sasuke, Sakura, and Naruto is explored in various ways. Fanfictions might show how their friendship endures through difficult times, like Sasuke's defection and his later attempts at reconciliation. It's about how they support each other no matter what.
Power - up themes are quite frequent. Fans like to write about Sakura getting stronger, Sasuke mastering new jutsus, and Naruto achieving new levels of power. It's also common to see themes related to family. For example, how Sasuke deals with his family legacy and how Naruto's lack of a traditional family shapes his character, and how Sakura fits into their family - like bond. It's really interesting to see how different authors explore these aspects in fanfiction.
One common theme is the deepening of their emotional connection. Since they are married, the fanfiction often focuses on how they understand each other better. Another theme could be the exploration of their physical relationship, which is where the 'lemon' part comes in. Also, there might be themes related to family, like starting a family together or dealing with the expectations of being a married couple in the ninja world.
Family bonds are a common theme. Since they're siblings in these fanfictions, it often explores how they support and care for each other.
Love and redemption are common themes. Sasuke has a troubled past, and often in these fanfictions, Sakura's love is what helps him find redemption. For example, in many stories, Sasuke realizes the error of his ways because of Sakura's unwavering love for him.
One common theme is redemption. For example, Sasuke often has a journey of redeeming himself after his dark turn. Another theme is friendship, like how Naruto's unwavering friendship for Sasuke is a central part. Also, the idea of sacrifice, as seen with Itachi's great sacrifice for the village and his brother.
Another theme is redemption. Sasuke has had a troubled past. In these fanfictions, his love for Naruto and Sakura can be a driving force for his redemption. For example, he might strive to be a better person to deserve their love and trust.
One common theme is alternate universes. It allows for really insane scenarios where the characters' personalities or abilities can be completely different.