Well, it's quite a strange and inappropriate idea. Naruto has always been about growth, love, and unity. A fanfic with such a concept might be someone's attempt at creating a shock factor, but it doesn't really fit with the Naruto universe. It's like taking a heroic and beloved character and twisting him into something dark and immoral that he was never meant to be.
Such a fanfic could cause a divide in the fandom. Some might be curious about the dark twist, but many would be offended. It could also give a wrong impression to new fans who might not know the real Naruto well. It's like polluting the positive image of the Naruto world with something so out of character.
Hard to say. Fanfics can be very diverse and it depends on the creativity of the writers. But you could try looking on popular fanfic websites and using relevant keywords to search.
Even a new character created specifically for the fanfiction could be the serial killer. This character could be someone with a grudge against Beacon Academy, for instance. They might be killing students or professors in a way that ties into some dark secret or vendetta they have against the institution.
Jeffrey Dahmer's story is also among the top. He committed heinous crimes including murder, dismemberment and necrophilia. His actions were so disturbing that it shocked the world when his crimes were discovered. He lured his victims, mostly young men, to his apartment.
Yes, there could be. Some fanfic writers might take the idea of a serial killer in the Harry Potter universe but tone down the disturbing elements to make it suitable for a wider audience. For example, they could create a mystery - solving plot where the characters are trying to catch a'serial killer' in a way that is more about intrigue and less about gore or extreme violence.
I'm not sure if it's popular. There are so many Naruto fanfics out there that it's hard to say which ones are popular without looking at fanfic rankings or community discussions.
Jeff Lindsay's 'Darkly Dreaming Dexter' is a great one. It's about Dexter Morgan, a blood - spatter analyst for the Miami police who also has a dark secret - he's a serial killer who only targets other killers. The book is full of dark humor and interesting characters.
In female serial killer fiction, the motives are often more nuanced. For example, it might be related to issues like motherhood, jealousy in relationships, or a sense of being wronged in a very personal way. In male serial killer fiction, motives can be more about power, control over others, or sexual gratification. Female serial killers in fiction are sometimes portrayed as more covert, using their femininity to deceive, while male ones might rely more on brute force or intimidation.