One possibility is that Rin would have told Naruto about Obito. This could shape Naruto's view of the world in a very different way. He might be more determined to find a way to bring peace to the world, not just for the present but also to fulfill what he might see as Obito's unfulfilled dreams. And Naruto's relationship with Kakashi could also be very different, as Kakashi has a deep connection with Rin and Obito. They could form a more complex bond, with Naruto having a unique perspective on Kakashi's past.
The plot could be really interesting. Since Obito has been through so much, he might train Naruto in a more unorthodox way. Rin, on the other hand, would provide a more nurturing and moral compass for Naruto. They could also influence Naruto's relationships. He might not have the same bond with Sasuke or Sakura as in the original. Instead, he could form new alliances based on what he learned from Obito and Rin.
Well, one possibility is that Rin would instill in Naruto her own values from the Hidden Leaf. Maybe she'd focus on teaching him about teamwork early on. Since she was a medic - nin, she could also start training Naruto in some basic medical ninjutsu, which would be a unique addition to his skills.
His view of the ninja world could be more idealistic. Rin had a certain purity about her. Naruto might strive for a world that is even more harmonious than in the original story. He could also be more focused on the well - being of his comrades, as Rin always put others first. For instance, he would be quicker to offer medical help or emotional support to his friends in difficult times.
Naruto's character would likely be more complex. He'd be less naive perhaps. Growing up with Obito and Rin, he'd have a different understanding of the ninja world. He might be more secretive too, as Obito has his own secrets.
His taijutsu might be more refined. Rin, having trained with Kakashi and Obito, could pass on some unique close - combat techniques. Naruto might also have a better understanding of chakra control from an earlier age. Since Rin was good at medical ninjutsu, Naruto could potentially combine that with his own chakra - based attacks in creative ways.
In a fanfiction world where Naruto and Rin have a baby, it could be a very interesting story. Maybe the baby would inherit Naruto's positive attitude and Rin's kindness. The story could explore how they raise the child in a world full of challenges and ninjas.
Well, perhaps the story could involve Sakura facing challenges that Rin had also faced while growing up. Rin could guide Sakura through difficult times, like dealing with the pressure of being a ninja in a war - torn world. Sakura might also learn about the history of the Hidden Leaf Village from Rin, which could give her a deeper understanding of her role as a ninja.
Kakashi is known for his laid - back yet highly skilled nature. His influence on Naruto could be in terms of teaching him to be more strategic in battles. Rin, being kind - hearted and having a strong sense of care, would give Naruto the emotional support he lacks. So Naruto might become more balanced in his approach to life and ninja - hood.
I'm not sure about the absolute best, but some authors might stand out if they have a deep understanding of both Naruto's and Rin's characters. Those who can capture Naruto's determination and Rin's kindness in their writing would be great. Look for authors who have a lot of positive reviews on fanfiction platforms.