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.
86 is indeed a light novel. It gained popularity as such and then branched out into manga. The light novel typically offers more detailed character development and in-depth exploration of the story's themes compared to the manga adaptation.
Since I haven't read the novel, I can't say for sure who the main characters are. They could be a hero who embodies light and a villain who represents shadow.
I'm not sure specifically as there could be many novels with such a title. It might be about the conflict or contrast between light and shadow, perhaps in a symbolic sense like good vs evil, or different aspects of a character or society that are represented by light and shadow.
The light novel often has more in - depth plot development. It can go into greater detail about the world - building, character backstories, and the complex rules of the games. The manga, while visually appealing, sometimes has to simplify things for the sake of fitting into the panel - by - panel format.
Radiant is primarily a manga. It features detailed illustrations and a captivating plot that has attracted a wide audience. The manga version has a dedicated fan base.