It's fairly common. Fans often look for more content related to their favorite shows. Since 'Attack on Titan' has a large and passionate fan base, there are a lot of fanfics available. 'Aot' fans might watch (read) these fanfics to explore different scenarios that the official story didn't cover. For example, they might want to see how a certain character would react in a different situation or what would happen if a major plot event had a different outcome.
Well, 'light vs shadow light novel' could center around the concept of duality. The light might symbolize good, hope, or positive forces, while the shadow could stand for evil, mystery, or negative aspects. It may tell a story of a hero from the side of light facing challenges from the shadowy elements in the story's universe, with lots of plot twists and character development.
I'm not entirely sure about its global popularity, but within the niche of light novel enthusiasts, it may have a certain following. If it has been translated into multiple languages and has a lot of fan - made content around it like fan art or fanfiction, that could be an indication of its popularity.
I'm not sure specifically as there could be many 'shadow light novels'. It might be about a world filled with shadows, perhaps with characters who have to navigate through a shadowy realm, or it could involve some mystery related to shadows.
A 'war of light and shadow fanfic' could potentially explore the themes of good versus evil, which are often associated with light and shadow. It might create unique characters that embody these opposing forces and their struggles.
The Eminence in Shadow light novel is finished. It provided a conclusive ending for the characters and their adventures, leaving fans with a complete narrative.
There could be various fanfictions. Maybe some that focus on alternative endings, like ones where certain characters survive who didn't in the original. For example, a fanfiction where Erwin survives and leads the Scouts in a different way.