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.
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.
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.
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.
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 protagonist is surely an important character. His actions and decisions drive the story forward. There may also be his friends or allies who play crucial roles, like those who have been with him since the earlier volumes and continue to support or challenge him in this one.
In the Overlord 13 novel, Shalltear Bloodfallen is important too. She has great power and her relationship with Ainz is complex. Demiurge, with his intelligence and strategic thinking, is also a key figure. He helps Ainz in planning and dealing with various situations in the New World. Then there are the various other Floor Guardians who each have their own personalities and roles within the story.