Well, Naruto being older might make him more of a mentor figure to the Rookie 9. He could have more experience and knowledge to share, which would strengthen his bonds with them. For example, he might be better at guiding them in their ninja training and help them avoid some of the mistakes he made when he was younger.
It can create a negative association. If the fanfiction is popular enough, some people might start to think that Naruto's relationship with the Rookie 9 in the actual series is also bad, which is not true.
In a fanfic where Naruto is older than the Rookie 9, he may have a different role in the village. Maybe he is already on the council or has a more influential position. He could use his influence to give the Rookie 9 better opportunities. For instance, getting them access to more difficult and rewarding missions that would help them grow faster as ninjas. His age difference would also mean that he has more wisdom and could offer better advice on things like handling relationships within the team and with other villages.
The rookie 9 seeing Naruto's scars is a moment of revelation. Naruto has always been a bit of an enigma to some of them. His scars could make Hinata even more protective and caring towards him. Lee might find even more inspiration in Naruto, seeing his physical marks as a testament to his never - give - up attitude. Sasuke, on the other hand, might have a complex reaction. He may be reminded of his own journey and how Naruto has also suffered, which could potentially change their dynamic in some way.
Well, Rookie might protect Naruto by always being by his side during dangerous missions. For example, when facing strong enemies, Rookie could use his own skills to shield Naruto from attacks.
It adds more depth to the characters. We already know the Rookie 9 from the original story, but in fanfiction, we can see them in new situations that bring out different sides of them.
If Choji has a better jutsu for his size - increase, it could make him a more integral part of the team. His friends would see him in a new light and they might have more group strategies that revolve around his new power. Kiba and Akamaru's new transformation jutsu would make them a more formidable duo, and the others would respect their fighting ability more. This would enhance the overall camaraderie among the rookie nine.
A plot idea could be that Naruto, being older, is assigned to lead a special mission with the Rookie 9. He has to use his experience to keep them safe and complete the mission successfully. During the mission, he could teach them how to work together more effectively.
Well, in a fanfiction about the Rookie 9 as adults in Naruto's past, one aspect could be their relationships. Some might have developed deeper friendships, while there could be new rivalries or romances. Their skills would also have evolved. Sakura could be a highly skilled medical ninja, and Naruto might be well - on - his - way to becoming Hokage even in the past - themed fanfic. They would all contribute to the village in different ways.
His illiteracy might make his friends initially frustrated. For instance, Sasuke, who is more studious, could be impatient with Naruto's inability to read important messages. But as they grow, they might become more understanding.
With Sasuke, it could either drive a wedge or bring them closer. If Sasuke blames himself for Naruto getting injured while protecting him, he might distance himself out of guilt. On the other hand, it could also make Sasuke realize how much Naruto means to him and he could become more committed to their friendship.