One interesting plot point is their comical interactions. Kazuma's practicality often clashes with Megumin's explosive and somewhat over - the - top personality. For example, when they go on quests together, Megumin's insistence on using her Explosion magic at every opportunity, despite the drawbacks, creates a lot of humorous situations. Another is the development of their relationship. It's not a typical love story but more of a slow - burn friendship with hints of something more, which keeps readers intrigued.
A possible crossover could be in the form of a cooking competition. Since both series have characters who are somewhat inept at normal, everyday tasks like cooking. Emilia from 'Konosuba' and Emi Yusa from 'The Devil is a Part - Timer' could end up in a cooking battle where they both struggle to make a decent meal. The chaos that ensues with their respective friends trying to help (or hinder) would be a great aspect of this crossover in the fanfic.
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.