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.
In Overlord volume 9, while Ainz Ooal Gown is still the central character, there might be some new minor characters related to the political affairs of the human kingdoms. These characters could be nobles or advisors who interact with Ainz's representatives. The guardians of Nazarick, especially those who are more involved in external affairs in this volume, like Shalltear Bloodfallen, also play important roles. They are the ones who often face the challenges outside of Nazarick and report back to Ainz, so their actions and decisions are crucial to the plot.
Well, Ainz is of course the most important character throughout the series, including volume 9. However, in this volume, there could be some characters from newly explored areas or groups. Maybe there are some adventurers who cross paths with Ainz's forces. They can be important in showing how the outside world views Nazarick. Also, among the Nazarick residents, characters like Demiurge who are constantly devising plans to further Ainz's goals remain important. His actions in volume 9 in terms of handling different situations, whether it's dealing with internal Nazarick matters or external threats, are significant for the story.
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 don't have the specific information about new characters in Volume 15. But it's possible that there are new characters related to the religious or cultural aspects of the world in the light novel. Maybe there's a new high - ranking priest or a scholar who has knowledge about some long - lost secrets. These new characters would then interact with Ainz and his comrades, creating new storylines and conflicts.
Since I haven't read volume 14 in detail, I can't say for sure who the new characters are. But it's possible that there are new members of a guild or organization that Ainz has to deal with. These characters could bring new dynamics to the story, whether they are powerful warriors, cunning mages or something else entirely.
Ainz is still one of the main characters, of course. His actions and decisions drive a lot of the plot. There might also be some new characters related to the various factions that are introduced, but I can't recall their specific names right now. But generally, they play important roles in the power struggles and conflicts within the story.
The main character, of course, is very important. His name is Ainz Ooal Gown. He is the one who has to navigate this new world. Then there are his servants, like Albedo, who are quite loyal to him and play significant roles in the story.
Ainz is of course the most important character. His decisions and actions drive the plot forward. Albedo also plays a significant role. She is extremely loyal to Ainz and her actions often reflect her devotion. Then there's Demiurge, who is very intelligent and his strategic planning is crucial in many situations. These characters' interactions and their individual goals shape the story in this volume.
The protagonist, of course, is very important. His actions and decisions drive the story forward. There may also be some key subordinate characters that play crucial roles in this volume, perhaps in battles or in diplomatic situations.
Ainz Ooal Gown is a given as an important character. He is the lich - king - like figure who rules over his territory. Albedo, his devoted follower, is also likely to be important. She is often at his side, providing support and sometimes her own unique perspectives. Demiurge, with his intelligence and strategic thinking, is another character that might be crucial in volume 17. Additionally, there could be new and interesting characters from different races or factions that emerge as important due to the events in this volume.
Ainz Ooal Gown remains the most important character. His decisions and actions drive the plot forward. He is constantly strategizing about how to expand his influence in the new world.