Definitely Naruto himself. Writers like to explore how Naruto would interact with edo tensei versions of his friends or foes. His positive attitude and his growth throughout the series can be further explored in these scenarios. Kakashi Hatake is also popular. His relationship with his old comrades who could be resurrected through edo tensei can be a central theme. For example, his interactions with Obito in edo tensei form can lead to some very emotional and action - packed stories.
Sasuke Uchiha is often a central character in 'naruto edo tensei fanfiction'. His brooding nature and his quest for power can be further developed when he encounters edo tensei characters. Also, Minato Namikaze, Naruto's father, is quite popular. Writers can explore his relationship with Naruto in more detail, especially since he was resurrected briefly in the original series. His wisdom and skills as a shinobi can be put to use in different and interesting ways in fanfiction.
Itachi is often a very popular character in edo tensei Naruto fanfiction. His complex backstory and his relationship with Sasuke make him a prime candidate for interesting fan - created stories in the edo tensei setting.
Naruto himself is often a central figure. His clones add an interesting dynamic, especially when combined with edo tensei. Sasuke is also popular as his relationship with Naruto can be explored in new ways with the clone and edo tensei elements.
Hashirama Senju is often a popular character in these fanfics. His powerful Wood Style jutsu and his status as one of the founders of the Hidden Leaf make him a fascinating addition to any Edo Tensei - related story.
In 'edo tensei using naruto fanfiction', characters like Neji Hyuga could be brought back. His death was unexpected and sad. His return could show how his views might have changed in the afterlife and how he could contribute to the story again. Kakashi's old comrades, like Obito (before his final redemption), could also be brought back. This could explore their relationships in a new light and add more drama to the fanfiction, especially considering Kakashi's development over the course of the Naruto series.
Definitely Itachi Uchiha. His character is complex and his skills are amazing. Having him in an Edo Tensei fanfic can add a lot of depth and mystery. Another popular choice is Minato Namikaze. Fans love his cool - headedness and his powerful jutsu. His presence in an Edo Tensei - related story can bring in a lot of action and strategic elements.
One popular theme is family reunion. Since Kushina was Naruto's mother, a lot of fanfictions focus on the emotional moments when they are reunited through Edo Tensei. It's all about the love and the things they missed out on when she was gone.
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.
Obviously, Naruto would be one of the main characters since it's in the title. He's the one who has mastered Edo Tensei. There might also be characters like Sasuke. Sasuke could be either an ally or an antagonist depending on how the story goes. Maybe he's jealous of Naruto's new power or he wants to use it for his own purposes.
The theme of power struggle often appears. With the powerful Edo Tensei - resurrected characters in the mix, there can be intense power struggles among different groups or individuals. Who will control these powerful forces? This creates a lot of tension and conflict in the fanfiction.
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.