In the 'konosuba explosion light novel', the story is centered around Kazuma's attempts to make a living in this new world. Megumin's obsession with explosion magic plays a big part. Her powerful but draining explosion spells cause all kinds of mayhem. For example, they might use it to defeat monsters, but also accidentally destroy parts of the town, leading to all sorts of hilarious consequences.
Kazuma is the main character around whom the story revolves. He's a regular guy thrust into an extraordinary situation. Aqua is a goddess who is more trouble than she's worth at times. Megumin is a very distinct character with her fixation on explosion magic. Darkness adds another layer of humor with her masochistic nature. All of them together create the chaotic and fun dynamic in the 'konosuba explosion light novel'.
The Konosuba light novel is not a fanfic. It has its own unique plot, characters, and world-building developed by the author's imagination and creativity.
The Konosuba light novel is good. It has a charming mix of fantasy elements and comedic situations that make it highly enjoyable. The character development is also well done.