Since I don't know this particular 'jus primae noctis light novel', it could potentially be about a historical or fictional concept. Maybe it's set in a medieval - like world where there are power struggles and the story revolves around the main character's journey through this complex society. It could also be a love story intertwined with some political or cultural elements.
There are fanfictions where the characters struggle with the moral implications of jus in bello in the Supernatural world. They have to decide whether to follow the rules of just war when dealing with demons and other creatures. In some stories, they form treaties with certain groups based on these principles, which adds a whole new layer of complexity to the plot.
I'm sorry, I have no information about the main characters in 'jus primae noctis light novel'. However, in most light novels, the main characters often have distinct personalities. They might be brave, intelligent, or have some flaws that make them more relatable. Maybe in this light novel, there are characters who are on a quest, or characters who are trying to protect something or someone important.
Guts is purely fictional. It's a concept or character that exists within the realm of imagination and creative storytelling rather than being based on reality.
Archive of Our Own (AO3) also has a wide range of Supernatural fanfictions. You can try searching for 'Supernatural jus in bello' in the search bar. There are often tags and filters that can help you narrow down your search to find exactly what you're looking for.