One possible fanfiction could be about the Fifth Kazekage's adventures in the Hidden Leaf Village after forming an alliance with Naruto. They might team up to face a new threat that neither of their villages could handle alone.
Obviously, Naruto and the Kazekage are the main characters. Naruto, with his determination and powerful jutsus, and the Kazekage, who represents the power and mystery of the Sand Village.
One possible story could be that Sakura goes to the Sand Village for a medical mission while Gaara is Kazekage. They start to interact more, and Gaara is impressed by Sakura's strength and kindness. Eventually, they form a strong friendship that helps in strengthening the bond between the Leaf and Sand villages.
One possible storyline could be that Naruto is chosen as a temporary Kazekage due to a threat that requires his unique skills. He then has to deal with internal conflicts within the Sand village while also facing external enemies. Another could be that there is some kind of prophecy that only Naruto can fulfill as Kazekage to save both Konoha and Suna.
Yes, there could be such a fanfiction. It might be about Naruto taking on the role of the Kazekage for some reason. Maybe there's a plot where Konoha and Suna form an even closer alliance and Naruto is sent to Suna to lead as Kazekage for a time. This could lead to all sorts of interesting scenarios, like Naruto having to deal with the different political and cultural aspects of Suna compared to Konoha.
Another theme is redemption. Since some Kazekage characters may have made mistakes in the past, fanfictions might show them trying to make up for it and regain the trust of their people. It can be a very emotional and character - building journey.
Character interaction. Sakura and the Kazekage usually have very distinct personalities, so seeing how they interact, whether it's in friendship or something more, is a key element.
One possible motive could be Sasori's desire to create the perfect puppet. Sakura, being a strong kunoichi, might have physical and chakra attributes that Sasori finds appealing for his puppet - making. He may see her as a unique specimen to add to his collection of puppets.
When writing Sasori's character interactions in a crossover, consider his past. He has a lot of trauma related to his own transformation into a puppet. If he meets a character who has also faced some form of self - alteration or loss of humanity, there could be a deep connection. Maybe they start by sharing their stories hesitantly and then form an unlikely bond based on their shared experiences.
In the fanfiction, they could have a mentor - mentee relationship. Naruto, with his big heart and positive attitude, could be the one to show Sasori a different way of looking at things, like a mentor. Or Sasori could teach Naruto some of his puppet - related skills, acting as a mentor in that aspect.