Obviously, Naruto would be the main character as it's about his revenge on Konoha. Sasuke could also play a significant role. He has his own issues with the village, and he might either support Naruto's revenge or try to stop him depending on how his character is developed in the fanfic. Sakura might be there too. She could be caught in the middle, trying to figure out whether to side with Naruto or stay loyal to Konoha. And Kakashi, as Naruto's former teacher, would likely be involved. He might be one of the people Naruto has to face if he's set on his revenge, or he could be trying to reason with Naruto.
In a 'naruto revenge on konoha fanfic', Naruto is the central figure for sure. However, other characters like the Hokage at that time would be important too. If it's Tsunade, she would have to deal with Naruto's actions. She has a soft spot for Naruto but also has to protect Konoha. Then there are the members of the Akatsuki. Some of them might see Naruto's revenge as an opportunity to further their own goals. For example, Pain could try to manipulate Naruto into causing more chaos in Konoha so that he can achieve his vision of peace through destruction. Also, characters like Jiraiya might appear in flashbacks, influencing Naruto's decision - making process regarding his revenge.
Sasuke could be one of the characters to support Naruto. Given their complex relationship and Sasuke's own issues with Konoha in the past, he might see Naruto's cause as just. Another one could be Jiraiya. If he were alive and found out about the real reasons behind Naruto's revenge, he might side with Naruto as he always cared for him deeply. Also, some of the outcast ninja within Konoha, like those who have been discriminated against because of their bloodline or lack of skills, might support Naruto as they also have grudges against the village system.
Obviously Naruto himself is the central character. Sasuke would also likely be involved. Given their history and Sasuke's own complex relationship with Konoha, he might side with Naruto or at least be a key figure in the events. Kakashi too, as he has been Naruto's teacher and is an important figure in Konoha. He could be caught in the middle, trying to understand Naruto's motives and also trying to uphold Konoha's stability.
Well, in the 'naruto trains and returns to konoha fanfic', Naruto is the central figure. For his training, he could meet some new characters who are experts in certain ninja arts. But in Konoha, all his old comrades will be there. Shikamaru, who is known for his intelligence, might be involved in planning something related to Naruto's return. Ino could be there too, perhaps using her mind - related jutsus to help in some way. And of course, the old sages or elders of Konoha would also be present to assess Naruto's growth and the impact of his return on the village.
Obviously, Naruto himself would be a main character. His friends like Sasuke and Sakura are also likely to be important. Maybe their children could also play significant roles as they grow up in the post - return to Konoha era.
The elders of Konoha could be the main antagonists. They are often the ones making the big decisions in the village. If Naruto is seeking revenge, it could be because of their actions, like how they treated him when he was a child or how they might have hidden important information from him.
The main characters are, of course, the Konoha Twelve. This includes Naruto Uzumaki, Sasuke Uchiha, Sakura Haruno, and others. They are the focus of the fanfic and usually the ones driving the story forward with their actions and decisions.
Another main character could be Kakashi. As Naruto's former teacher, he might be conflicted about Naruto's exile. He could be trying to find a way to bring Naruto back to Konoha or at least help him in some way while also having to deal with the village's decision. And of course, there could be new characters introduced specifically for this fanfic, like a mysterious figure who helps Naruto during his exile.
The main characters would most likely start with Naruto. His character would be central to the story. Alongside him, we might see the Hokage at the time also playing a role. Additionally, there could be a group of shinobi who are specialized in dealing with demons that Naruto teams up with. And perhaps some of the villains or demons themselves could be considered main characters in a sense, as they drive the conflict in the story.
Definitely Sasuke. Their bond is such that Sasuke would not stand by and let Naruto destroy Konoha. He has his own reasons to protect the village now. Shikamaru is also a likely candidate. He's intelligent and would quickly figure out that Naruto's actions are wrong. He would use his strategic mind to try and stop Naruto. And Hinata, who loves Naruto deeply, would oppose him in the hopes of bringing him back to his senses.
Sasuke could be one of the characters to support Naruto. They have a deep bond, and Sasuke might understand Naruto's reasons for wanting to change Konoha. Also, Shikamaru, being a smart strategist, might see the potential in Naruto's plan and choose to support him.