Well, light novels usually have interesting characters and engaging plots. In the case of 'sasaki to pii chan light novel', it could be centered around the two main characters, Sasaki and Pii Chan. It might explore their personalities, dreams, and how they interact with the world around them. It could also include elements like school life, if they are students, or their jobs if they are adults. There could be a mystery to solve, or it could be a slice - of - life story that just shows their day - to - day experiences.
One of the senior and more experienced members of the guild. They have seen a lot and know how things should be done in the guild. If Natsu acts in a way that goes against their long - established ways, they would not hesitate to berate him.
I have no idea, because there are many novels that could potentially have something related to 'Tsuki Ga'. You could check the table of contents or search within the text to find the relevant chapter.
Lucy could be a main character. Since she's often by Natsu's side, she would likely be deeply involved in his recovery. She could use her celestial spirit magic to try and protect him while he's injured or search for a way to heal him.
One common theme is self - discovery. When Natsu meets another version of himself, he often learns new things about his own capabilities and personality. Another theme is cooperation. Since they are essentially the same person, they have to learn to work together despite their initial differences.