Kazuma is an important character. He is the main protagonist who is transported to the fantasy world. Aqua, a goddess, is also crucial as she has her own powers and a very distinct personality. Darkness, with her unique set of skills and somewhat strange preferences, is another important figure. And Chris, who is likely the focus of this light novel, has her own role and story within the overall plot.
One of the main themes is adventure. The characters are constantly on quests and facing various challenges in a fantasy world. Another theme is friendship. Despite their different personalities, they work together and support each other. Also, there is a theme of self - discovery as the characters grow and learn more about themselves during their adventures.
I'm not entirely sure, but it's very likely. TvTropes is a comprehensive database for all kinds of fictional works. Given Konosuba's popularity, especially in the anime and light novel world, it would make sense for there to be a section about its visual novel on TvTropes. You could check by searching for 'Konosuba visual novel' on the TvTropes website.