I don't have the exact details on Volume 9, but considering the pattern of the series, there could be powerful hunters from other regions introduced. They might come with different fighting styles and powers. There could also be some characters who are somehow related to the ancient history or mystery that the series often delves into.
Since I haven't read Volume 9, it's hard to say precisely. However, based on the previous volumes, new important characters could be those who hold the keys to understanding the deeper lore of the world of Solo Leveling. Maybe there are characters who have knowledge about the true nature of the gates or the source of Jin - Woo's power. These characters would play important roles in either helping or hindering Jin - Woo in his journey.
There could be new characters in Solo Leveling Volume 9 novel. It's possible that there are new recruits in the hunter organizations that Jin - Woo is associated with. These new characters could bring in fresh perspectives and new storylines. Maybe there are also some characters from other dimensions or parallel worlds if the story takes a more fantastical turn in this volume, which would add a whole new layer of complexity to the plot.
The main character is of course very important. His growth and development drive the story forward. Also, some of the leaders of the guilds become more prominent in this volume. They play important roles in the power dynamics and decision - making processes. And there are new characters who are introduced as allies or antagonists to the main character.
In Solo Leveling Vol 6, there might be some new characters related to the deeper exploration of the gates. However, Jin - Woo remains the most important character. His friends and some of the guild leaders also continue to be important as they interact with Jin - Woo in different ways.
There is also a young trainee who looks up to the main character. This trainee has potential but is also naive in some ways. His interactions with the main character and other experienced characters provide some lighter moments in the story as well as show the growth of the next generation in this world.
In Solo Leveling 92 light novel, the characters who hold key information about the world or the power system are important. For example, an old sage - type character who can guide the protagonist with his knowledge. Also, any character that has a personal vendetta against the main character or his allies can be significant as they create conflict and drive the plot.
Also, any characters who are related to the mystery of the dungeons, like those who have some knowledge about the ancient history or the origin of the dungeon system. They could provide Jin - Woo with crucial information or act as obstacles in his quest to understand more about the dungeons.
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'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.
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.