It's possible that in volume 6, some characters from different classes who were previously in the background come to the forefront. These characters might have unique skills or knowledge that can either help or hinder the main characters. Also, there could be some characters related to the school's management system, like those in charge of specific tests or evaluations, who are introduced to add more complexity to the story and the relationships among the students.
I'm not entirely sure which new characters are introduced specifically in volume 5, but likely there could be some new students or faculty members who play significant roles in the power dynamics and plot development.
Horikita Suzune also plays a significant role. Her determination and growth as a character are likely to be explored further in volume 4. She is constantly striving to improve herself and her class's standing.
Horikita Suzune is also crucial. She is ambitious and determined to succeed in the school's system. Karuizawa Kei is another important character. Her relationship with Ayanokoji becomes more complex in this volume. There are also other characters like Kushida Kikyo who has her own secrets and motives, and they all play important roles in the development of the story in 'classroom of the elite vol 2 light novel'.
The main character, of course, is a very important one. His actions and decisions drive the story forward. Then there are his classmates. Some of them are rivals, like those who are also vying for the top positions in the school. And there are the teachers as well, who play a role in creating the rules and the overall environment of the school.
Ayanokoji Kiyotaka is quite interesting. He is a very intelligent and mysterious character who often operates behind the scenes to achieve his goals.
One important character could be new adversaries that Ainz and his group face. These characters bring new challenges and often have unique abilities or motives. Another might be some minor characters within the native population of the new world that help to flesh out the world - building aspect.
In this volume, the Lizardmen leaders such as Crusch Lulu are important. They represent the native species that Ainz has to deal with. Among Ainz's subordinates, Demiurge also stands out. He is very intelligent and his strategies and ideas are important for Ainz's plans. There are also other minor characters among the lizardmen tribes that add to the richness of the story.
I'm not entirely sure about brand new characters introduced only in Volume 7. But of course, Bell Cranel remains very important. His growth and development are central to the story. And Hestia, as his goddess, is always significant. Other existing characters like Ais Wallenstein also continue to have an impact on the events in this volume through their interactions with Bell.
I'm not entirely sure which new characters are introduced specifically in volume 9. But generally, in the Overlord series, characters like Ainz Ooal Gown remain extremely important. His actions and decisions drive most of the story. The floor guardians such as Albedo also continue to be significant as they carry out Ainz's orders and protect Nazarick. There may be some minor characters from the human kingdoms or other races that are introduced to show the different perspectives in the world.
I think the plot in Volume 8 of 'Classroom of the Elite' is really interesting. It further explores the complex relationships among the characters. For example, the power struggles and mind games between the students become more intense. Also, the development of the main character's personality and his strategies in this competitive environment are quite fascinating.