If Naruto is reanimated by Edo Tensei in fanfiction, it could lead to a very different story arc. Naruto's abilities like his Rasengan and Sage Mode could be enhanced or distorted in this reanimated state. The story could explore how the village he loves so much reacts to his reanimation. His relationships with other characters would also change drastically. For example, Sasuke might be conflicted about fighting a reanimated Naruto. Also, the one who performs the Edo Tensei would have a difficult time controlling Naruto if his willpower remains as strong as it was when he was alive.
If Naruto is resurrected by Edo Tensei in the fanfiction, he could have a different perspective on life and death. Since he's come back from the dead, he might be more determined to achieve certain goals that he didn't fully accomplish when he was alive. He could also interact with characters who have passed away in a very different way. For instance, he could meet his father again and have some deep conversations about the future of the ninja world. This would add a lot of emotional depth to the story.
In fanfiction, if Naruto were revived by Edo Tensei, he might have a different perspective on life. Since Edo Tensei brings back the dead with their skills intact, Naruto could use his powerful jutsu to change the course of events in the story. He might also have interactions with his old friends and enemies in unexpected ways.
He could potentially change the whole course of the war. With Naruto's skills and his never - give - up attitude, he might be able to inspire the Allied Shinobi Forces even more. His powerful jutsu like Rasengan and Sage Mode could turn the tides against the enemy.
There would be chaos. The Edo Tensei brings back the dead, and in Fairy Tail, it would disrupt the natural order. Maybe the revived characters would cause trouble or be used as powerful weapons.
He might become more aggressive. The process of Edo Tensei could taint his positive nature. Instead of his usual friendly self, he could be more focused on the task given by the caster of the jutsu, which may be to cause destruction.
Well, if Naruto meets the Edo Tensei army in a fanfic, it could go in many directions. Naruto is known for his ability to turn enemies into friends. So he might try to understand the situation of those in the Edo Tensei army. Maybe some of them are there against their will. He could use his Sage Mode to sense their true intentions. If they are being controlled, he might try to break that control. And if they still attack, he'll defend himself and the village with all his might, using his Nine - Tails chakra if necessary.
In certain fanfic concepts, Naruto could learn Edo Tensei from Kabuto. Kabuto, having mastered the jutsu, might decide to teach Naruto for some reason. It could be because he sees Naruto's potential to use it in a more positive way compared to how he misused it. Naruto, with his strong sense of justice, would then try to modify the jutsu to be less evil - like not using it to bring back people against their will.
There's also a possibility that it could be an unknown villain. A new character created by the fanfiction author who has a vendetta against Konoha or the ninja world in general and believes that resurrecting Naruto through Edo Tensei would be a way to start some sort of revolution or destruction.
Naruto might initially be on guard and hostile towards Edo Tensei Madara. But as Naruto is, he would also try to understand Madara's motives. He could start by trying to talk to Madara, asking him why he still clings to his old ways even in his undead state.
They could change the storyline by providing Naruto with a stronger support system. Since they are his clan members, they might have knowledge and skills that can help him in his battles and his journey to become Hokage. For instance, they could teach him some powerful Uzumaki sealing techniques that no one else in the village knows.