One possible reason could be that Naruto notices Sakura has been struggling with her medical ninjutsu skills lately and he believes an evaluation will help her improve. For example, she might have made some mistakes during a recent mission where her medical skills were crucial.
Kakashi could also be involved. He is an experienced ninja and has trained both Naruto and Sakura. He can assess Sakura's overall ninja abilities, including her strategic thinking and combat techniques.
I'm not sure specifically as there could be many different interpretations in such a fanfiction. It might involve Naruto being sent back to his home by a kami (a god or deity in the Naruto universe) perhaps to deal with some unfinished business, or to reunite with his family and friends in a different way than the original story.
Obviously Naruto is one of the main characters. And since it involves a kami sending him home, the kami would also be a significant character, even if it might be a more mysterious or ethereal presence.
In such a fanfiction scenario, Naruto might use his knowledge from the future to prevent some disasters. For example, he could stop the Uchiha massacre by warning the clan early. He could also teach his younger self some advanced jutsu techniques, which would make him stronger much earlier in his life.
In this fanfiction, Naruto might use his knowledge from the future to change many things in the past. He could prevent some tragedies or form different relationships earlier.
Naruto has been through a lot in his own time, so he may use that experience to adapt to the past. He might start by making friends with the younger versions of people he knows. He'll also have to be careful not to reveal too much about the future to avoid disrupting the timeline. He could use his ninja skills to earn respect and find his place in the past world.
Yes, there might be in some fanfictions. Fanfiction writers often explore different relationships and scenarios that didn't occur in the original Naruto series. However, not all fanfictions will have Naruto and Sakura kissing. It depends on the plot and the direction the writer wants to take.
Sure. In fanfiction, the relationship between Sakura and Naruto can be played around with a lot. Sakura's admiration for Naruto can be shown more prominently, making her seem like a fangirl. For example, she might be written to always be in awe of Naruto's new jutsu or his heroic deeds more than in the official story. It gives writers a chance to delve deeper into her feelings for Naruto in a different light.
Yes, there are likely to be such fanfictions. In the Naruto series, Sakura can be quite assertive and strong - willed. Her temper and skills could potentially be a source of intimidation for Naruto in the creative interpretations of fanfiction writers.