Naruto himself could be a main character in such fanfiction. Maybe he gets framed for pickpocketing and has to clear his name while also dealing with the real pickpocket who is causing chaos in the village.
The main characters can include the gunsmith, who might be an outsider to the traditional ninja world but has a unique skill set. Another could be a ninja who becomes the gunsmith's protector or partner. For example, Sasuke could be interested in these new firearms as a way to enhance his own power. And sometimes, there are original characters created specifically for the fanfiction, like a rival gunsmith who tries to outdo the main gunsmith in creating the most powerful weapons.
Often, there are also antagonist assassins who are main characters in a sense. They drive the plot by creating conflict. These assassins could have their own motives, like working for a powerful and shadowy organization. Their backstories, which might include things like being orphans trained from a young age to be killers, can add depth to the fanfiction.
Naruto is the central character in 'naruto dark naruto fanfiction'. But characters like Orochimaru can play a big role. He might see an opportunity in a darker Naruto and try to manipulate him for his own gain. Hinata could also be a main character in some fanfictions. Her love for Naruto might be put to the test as she tries to understand and save Naruto from his dark path. And the Sannin, especially Jiraiya, might be involved as they were important in Naruto's development in the original and could have a role in dealing with his new, darker nature.
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.
In many 'Cold Genius Naruto Fanfiction', Kakashi can play a significant role. He might be the one to notice Naruto's cold - related powers first and help him develop them. Another often - seen character is Hinata. She could be Naruto's love interest while also being involved in his journey as a cold genius, perhaps providing emotional support.
Yang Xiao Long, who is related to the Branwen family, can also be a main character in these fanfictions. She could meet Naruto and they could have some really fun adventures together. Maybe they compete in some sort of fighting tournament that combines the fighting styles of both universes.
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.
Obviously Naruto is a main character in most Naruto Saint fanfiction. He is usually the one who gets involved with the saint - like elements. Another character could be Sasuke. Sometimes in these fanfictions, Sasuke might be jealous of Naruto's new saint - related powers.
Well, obviously Chronoa herself is a main character. Naruto is also often included as he is the central figure in the Naruto series. They might interact in ways that change the course of the Naruto story. For instance, Chronoa could help Naruto unlock new forms or powers related to time.