Well, Naruto himself is often involved. Since it's related to Naruto, he's usually at the center of the story, whether it's him having to face the shadow god or somehow form an alliance with it.
Often, the shadow god itself is a main character in a sense. The fanfiction will focus on its actions, motives, and how it impacts the Naruto world. It could be a malevolent force that the other characters must fight against, or a misunderstood entity that they come to accept and work with as the story progresses.
Kakashi could be another main character in such fanfiction. His knowledge and experience would be valuable in the shadow realm. He might be guiding Naruto and others, or he could be on his own mission related to the shadow realm, perhaps uncovering some secrets from his past that are connected to this mysterious place.
The Hokages, especially the Fourth Hokage who sealed the Nine - Tails in Naruto, could be main characters in 'naruto death god fanfiction'. Since they have had dealings with powerful and otherworldly forces, it's not a stretch to imagine them being involved with the Death God in some way. Maybe they made a secret pact with the Death God long ago, and this pact starts to surface in the fanfiction story, causing all sorts of chaos and revelations.
In 'naruto immortal god fanfiction', Naruto is the key character. But other characters like Hinata may also be significant. Hinata's love for Naruto could be a driving force for Naruto's actions even as he becomes an immortal god. Her unwavering support might be what keeps Naruto grounded in his humanity, or it could also be a source of conflict if Naruto's new powers put a strain on their relationship.
Well, Naruto is obviously the main character as he has the nine - tailed fox within him. Then there's the fox god itself, which is a central figure in these fanfictions. Sometimes, other characters like Sasuke might be involved. Sasuke could be curious about Naruto's new powers related to the fox god or even be in conflict with Naruto when the fox god's influence changes Naruto's behavior.
Well, Naruto is often a main character in these fanfictions. Since it's related to the Naruto universe and the idea of a kitsune god, Naruto's connection to the Nine - Tails makes him a likely candidate for interaction with the kitsune god.
Obviously Naruto himself is a main character. He's usually at the center of the story as he's the one dealing with the influence of the Evil God. Sasuke is also often involved, maybe as a rival or an ally depending on the plot. Sakura might be there too, trying to help Naruto or deal with the chaos the Evil God brings.
In many such fanfictions, Kakashi could play an important role. He has experience with Naruto's shadow clones and could offer guidance on how to control them or stop the incident from getting worse. Also, characters like Jiraiya might show up. Jiraiya could teach Naruto some new techniques to better manage his clones, or he might be involved in uncovering the mystery behind the abnormal clone behavior.
Naruto himself is often a central character in 'naruto destruction fanfiction'. Since he is the main protagonist of the original series, fanfiction writers like to put him in situations where he has to deal with destruction. Sasuke is also frequently involved as his rival, and their relationship can be explored in the context of destruction, like if they have to work together to stop a greater threat of destruction.
Well, Naruto is obviously a main character in most of these. But there could also be Sasuke. He might be either an ally or an adversary in relation to the dagger. For example, if the dagger has a power that can either be used for good or evil, Sasuke could be tempted by its darker potential.
Some fanfictions might also include characters like Kakashi in important roles. As Naruto's former teacher, he could be a guiding figure or someone who has to adapt to Naruto's new level of power. He might also be involved in trying to keep Naruto's power in check if it starts to have negative effects on the ninja world.