Definitely. Sword Art Online has a manga adaptation that brings the virtual world and adventures to life on the pages. It captures the excitement and fantasy elements of the franchise quite well.
I'm not entirely sure. It's possible that there are new characters introduced in Sword Art Online vol 15. The series often expands its cast as the story progresses, so new characters could be added to bring new plotlines or challenges.
In the Sword Art Online vol 9 light novel on Goodreads, we can expect a lot. Since the series is set in a virtual reality gaming world, this volume might explore deeper into the mechanics of the game. There could be a focus on the lore of the game world, how it was created and what secrets it holds. The relationships between the characters, especially romantic ones like Kirito and Asuna, might take new turns. And of course, there will be intense battles and strategic planning as they try to overcome the various obstacles in the game.
The Sword Art Online manga has indeed come to an end. It provided a satisfying conclusion to the series, tying up loose ends and giving closure to the characters' journeys.