Fanfiction often takes these characters in unexpected directions. Itachi's presence could lead to a more united front among the four. He could train Naruto and Sasuke together, which would change the nature of their relationship. Sakura might end up being a stronger bridge between them, as she has a connection to both Sasuke and Naruto. Writers can play with their personalities and backstories to create unique relationships that deviate from the original storyline.
In fanfiction, their relationships could be reimagined in many ways. For example, Itachi could have a more mentoring role towards Naruto, sharing his wisdom from a different perspective. Sakura might be more assertive in her relationship with Sasuke, not just being the passive admirer. And Sasuke could find a new sense of brotherhood with Naruto that goes beyond their rivalry, all because of different plot twists and character developments that fanfiction writers can create.
Often, in such fanfictions, the relationships can be really out of character. Naruto might be made overly possessive of Sasuke, and Sakura might be pushed to the side as an unwanted third party. But it's important to note that these are just fan - created ideas and not in line with the official Naruto storyline. The lemon aspect usually adds a lot of adult - like romantic and physical elements that are not suitable for all audiences.
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.
In an adult fanfiction, their relationship could be reimagined as two comrades who have a new level of respect for each other's abilities. They could be training together and constantly pushing each other to new limits. Their friendship might turn into a more complex relationship where they are each other's confidants, sharing secrets and dreams that they haven't told anyone else.
There would be other fans who might be intrigued. They like to explore different 'what - if' scenarios in fanfiction. They would see it as a creative way to explore the characters in a new light, even if it goes against the canon. However, they would also be aware that it's just a fictional alternative and not the real Naruto story.
Some fanfictions explore a romantic relationship between Naruto and Sakura, with Sasuke being the supportive friend. Naruto and Sakura start to notice the little things about each other. Naruto is always there to cheer Sakura up when she has a bad day at the hospital, and Sakura helps Naruto with his Hokage duties. Sasuke, with his own experiences, gives them advice on how to make their relationship work.
In the fanfiction, Itachi might be acting according to some secret mission that endangers Sakura's life. Sasuke, who has a strong bond with Sakura now, won't let that happen. He jumps in and uses his ninja skills. Sasuke could have developed some new jutsu that he uses to counter Itachi's attacks. This not only saves Sakura but also shows Sasuke's growth as a ninja. And Sakura, in turn, might be in the middle of researching some important medical ninja stuff that Itachi's actions could have disrupted if not for Sasuke.
In some fanfictions, Sasuke and Sakura's relationship is often portrayed as a more developed romantic one. Sakura is usually shown as being deeply in love with Sasuke still, while Sasuke may be slowly coming to terms with his feelings for her. Karin's relationship with Sasuke is more complex. She has an unrequited love for him, which can create some tension. Karin and Sakura's relationship can range from being rivals to begrudging allies depending on the story.
In some fanfictions, Sasuke's relationship with Sarada is full of misunderstandings. Sarada may feel that her father doesn't care about her. Sakura then acts as a mediator between them. Their relationship is also depicted as a strong family unit where they support each other in times of danger. For example, when Sarada is in trouble, Sasuke and Sakura will put aside their differences and come to her rescue.
Their relationships could develop in a more positive way. Through fighting together, they start to understand each other better. Naruto and Sasuke might finally put aside their old rivalries completely. Sakura could gain more respect from both of them as she shows her strength and intelligence in battle.
Naruto and Sasuke's relationship would likely become more stable. They would have to put aside their old rivalries for the sake of the 'family'. They might start to see each other as brothers - in - law in a sense. Sakura would be the bridge between them, her love for both of them in different ways helping to ease any remaining tensions. Naruto would probably become more protective of Sasuke, and Sasuke would be more open to Naruto's friendship.