Another theme is time - related. Since Homura has the ability to manipulate time in the show, many fanfictions play with this concept in relation to her relationship with Madoka. For example, stories might involve Homura going back in time to save Madoka in different ways or dealing with the consequences of her time - traveling on their relationship.
I'm not entirely sure as I haven't read it in detail. But generally, a light novel often involves various elements like character development, a unique plot, and perhaps themes related to youth, friendship, or personal growth. It might be about a story set in a world where music plays an important role, given the 'orchestra' in the title.
Trans-Siberian Orchestra was formed to create a unique blend of rock and classical music with a focus on elaborate stage shows and holiday-themed performances. Their music often tells emotional and epic tales.
Since it's an orchestra - centered light novel, there might be a talented young musician as one of the main characters. This could be someone who is new to the orchestra and has to learn to fit in. There could also be an older, more experienced member who acts as a mentor to the younger ones. Another possible main character could be someone who has a special connection to the orchestra, like a person who founded it or someone whose family has a long - standing relationship with the orchestra.
Well, the 'madoka visual novel' could be an immersive experience that dives into the world of Madoka. It may include elements like the battles against witches, the internal struggles of the magical girls, and the overall dark and complex themes of the Madoka universe.
I think there are several, but the exact number might change as new ones could be released. You might want to check reliable manga databases or official sources for the most accurate count.