Yes, there are likely to be such fanfictions. The 'Harry Potter' and 'Death Note' universes are both very popular, and fans often like to combine different fictional worlds in fanfiction. They might create stories where Harry Potter gets his hands on a Death Note and all kinds of interesting and unexpected scenarios unfold as a result.
Yes, there might be. Fanfiction often combines different universes and concepts in creative ways. Some fans like to blend the magic of Harry Potter, such as ESP - if that's what is meant here - with the dark and complex world of Death Note. However, it could also be a very niche or hard - to - find piece of fanfiction.
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.
Well, if Naruto had the Death Note, he might be really confused at first. The Death Note's power is so different from the chakra - based powers in Naruto's world. He could use it to take out some of the bad guys secretly, but his ninja code might conflict with using such a tool for killing. For example, Naruto believes in giving people second chances, and the Death Note is a very final and unforgiving weapon.
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.