User blog:Logan87654321/Volume 15 will be the only one to "feature" Aqua.

Volume 15 will pretty much be the only light novel thus far to actually have Aqua as a focal point. What makes this interesting is that, despite being arguably one of the main heroines and most definitely the 2nd most popular female character, she's had a novel "dedicated" to her per se. We've seen multiple with both Megumin and Darkness, as well as at least one for Wiz, Eris, and Iris (Eris and Iris both have 2!). While the latter 3 can most definitely be considered tertiary characters to the series, or just main supporting characters (along with Yunyun of course), they've been the main focus of various novels as previously alluded to.

Just thought this was interesting, especially so for me since Aqua is my waifu and because of the fact that the remaining 3 or so novels will undoubtedly focus on Kazuma and the Demon King if the current course follows the web novel (which there is no indication to say they won't).