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.
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 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.
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.
I'm not entirely sure about all the new characters in volume 14. But sometimes new characters are introduced to either help or hinder the main characters' progress. They could be other adventurers, or perhaps some mysterious figures related to the dungeon's secrets.
There might be new adventurers who join Bell's party temporarily or become their rivals. These new characters could bring in new skills and perspectives. Maybe there are also some characters from the background of the dungeon world, like merchants or informants who have important information related to the new challenges in Volume 8.
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 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 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.