The instrumentation can also contribute to making an OST suitable for a sad love story. Soft instruments like the piano or the violin are often used. The piano can create a very intimate and sad atmosphere with its solo notes. The violin, with its ability to produce long, drawn - out, and sometimes screechy notes, can add to the sense of drama and sadness. Also, the use of ambient sounds or a minimalistic approach in the music can enhance the feeling of emptiness or loss that is common in sad love stories.
Ryuk would probably just be amused. He is a Shinigami who has seen a lot in his existence. Fanfiction is just another strange human creation to him. He might chuckle at some of the more outlandish ideas in the fanfictions, like a character having superpowers beyond the Death Note.
Misa would likely be excited. She is a big fan of Light and the whole 'Kira' concept. In fanfiction, if there are scenarios where she has more power or a closer relationship with Light, she would be all for it. However, she might also get jealous if there are other female characters getting too close to Light in the fanfictions.
Oh, for sure! Death Note is considered a masterpiece in the manga world. Its unique concept and the way it unfolds make it a must-read. The characters' development and the moral dilemmas presented make it stand out from the crowd.