The real Death Note story is quite complex. Light Yagami discovers the Death Note and begins his crusade against criminals. He quickly becomes a sort of self - appointed judge, jury, and executioner. As he kills more and more people, his sense of morality becomes warped. L enters the picture and starts his investigation. L is a very unique character, with his odd habits like sitting in a crouched position. Their struggle is not just a physical one but also a mental and moral one. Light has to constantly come up with new ways to avoid detection by L, and L has to find ways to prove that Light is the one using the Death Note. It's a story full of suspense, moral dilemmas, and psychological battles.
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.