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.
Well, likely the main villain or antagonists in this volume are important characters. Their goals and actions create conflict. And also, any new characters introduced might be important as they could bring new dynamics to the story. For example, they might be powerful mages or warriors that challenge the existing power structure in the story.
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.
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.
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.
Probably the members of Ainz's guild are important. They might be involved in his plans or have their own sub - plots in Volume 17. And the local characters in the new world he is in, like some of the native leaders or powerful individuals, would also be important as they interact with Ainz and his group.
Ainz is surely one of the most important characters in this volume as he is the central figure in the whole Overlord series. His decisions and actions drive the story forward.
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.
The main character, with his unique abilities and leadership, is central. His minions, like Albedo and Demiurge, are important as they manage different aspects of the territory under his control. There might be some resistance leaders or representatives of other kingdoms in this volume who would be important in terms of creating conflict and driving the plot. These characters would have their own motives and goals which would clash with those of the main character.