I haven't read this volume specifically, but generally in the KonoSuba series, it often has hilarious and over - the - top adventures. Maybe this volume continues with the misadventures of Kazuma and his party in the fantasy world.
The main characters in the KonoSuba series, which likely are also the main characters in vol 16, are Kazuma, Aqua, Megumin, and Darkness. Kazuma is the cynical and somewhat perverted protagonist. Aqua is a useless goddess. Megumin loves her explosion magic, and Darkness is a masochistic crusader.
In Konosuba Vol 6, Kazuma is the leader - like figure of the group, trying to keep everyone in line. Aqua provides a lot of the comical relief with her lack of practical skills. Megumin's explosive magic is a key part of their combat strategy. And Darkness adds an interesting dynamic with her masochistic tendencies. Their different personalities clash and combine to drive the story forward in this volume.