In this 'naruto snaps at the rookies fanfic', Naruto is a key character. As for the rookies, it might be a group of young ninjas who are just starting out. They could be characters we already know from the Naruto series who are in their early days, or they could be entirely new characters created for the fanfic. Naruto's interaction with these rookies, especially his snapping at them, will be central to the story.
The main character is Naruto for sure as it's in the title. Regarding the rookies, it could be a mix of different characters. It might include some of the Konoha 11 when they were rookies, or it could be some newly introduced characters in the fanfic's universe. Naruto's reaction towards these rookies is what the fanfic seems to focus on, so all of them are important in the context of this fanfic.
Obviously Naruto is one of the main characters since the title mentions him. And the rookies are also main characters, though we don't know exactly which rookies without reading it. It could be the ones from his own generation like Sakura, Sasuke, etc., or it could be new rookies that Naruto is mentoring.
I'm not sure specifically as I haven't read that particular fanfic. But it might be about Naruto getting angry at the rookie ninjas for some reason, perhaps they made a mistake during a mission or did something that goes against his values.
Another character could be Kakashi. As Naruto's teacher, he might have some influence on how Naruto approaches the situation. He could either encourage Naruto to be more diplomatic or, if he also sees the council's wrongdoings, support Naruto in a more direct way. There could also be other ninja characters who are on the sidelines, observing this power struggle between Naruto and the council.
In a 'naruto finally snaps fanfic', Naruto is the main focus, but characters like Kakashi would be involved. Kakashi has been Naruto's teacher and mentor, so he would be affected by Naruto's change. Also, characters from other villages such as Gaara could be part of the story. Gaara has his own connection with Naruto, and Naruto's snapping would have an impact on their relationship and the balance between villages.
One reason could be that Naruto has been through so much himself and he might think rookies are naive. He's seen the harshness of the ninja world and doesn't want to coddle them. For example, he had to grow up without his parents and faced many life - threatening situations early on.
Obviously, Naruto himself is the central character as it's about him 'snapping'. Sasuke is also often involved. He might be a factor in what causes Naruto to snap, or he could be on the receiving end if Naruto's snapping is directed at his actions or decisions.
In some fanfictions, antagonists can also be important in relation to Naruto's mind snapping. For instance, Orochimaru might be interested in Naruto's new state. He could see it as an opportunity to either use Naruto for his own evil plans or study him to gain some new knowledge. So, the villains can have a significant role in the story of Naruto's mind snap.
Obviously, Ruby herself is the central character. But often, her team members like Weiss, Blake, and Yang are also involved. They play important roles in either causing the situation where Ruby snaps or in helping her get through it.
The main characters are typically the rookie Clone Troopers. They are new to the war and still learning the ropes.
The main character is Goku, no doubt. However, Bulma could also be a significant character. She is often involved in the group's adventures and might be the one who discovers what's wrong with Goku when he snaps. Additionally, Whis and Beerus could be important characters in this fanfiction. As deities, they might have insights into Goku's state or even be the ones to try and calm him down if his snapping causes chaos in the universe.
Obviously, Kokichi is one of the main characters since it's in his name. But there could be other characters as well. It might include his friends or rivals from the original source material. For example, if it's related to a game, characters like Shuichi or Kaito could be involved as they interact with Kokichi during his 'snapping' moment.