doomsday kills everyone

Probably not. Given that the Harry Potter series is mainly about positive values like friendship and fighting evil, a fanfic where Harry kills everyone goes against those values. It's likely to be a very dark and disturbing story that may not be suitable for all audiences, especially younger fans who are used to the more positive and heroic image of Harry.

Well, it could be a very dark and alternative take on the Harry Potter universe. Maybe it's a fan - created story where the character Harry, for some extreme reason like being corrupted or in a very different version of events, decides to kill everyone. But this is quite a departure from the original story's themes of friendship, love and fighting against evil in a more heroic way.

Yes, it is quite disturbing. Harry is typically seen as a hero, and the idea of him killing everyone goes against his fundamental character. It subverts the positive and heroic image that fans have of him, and it involves a lot of death and destruction which is generally not pleasant to think about.

No. Most Naruto fans are drawn to the original themes of the series like friendship, hard work, and redemption. A fanfic where Naruto kills everyone goes against these core values and is likely to be very unappealing to a large portion of the fan base.

Well, it could be a dark AU (alternate universe) where Naruto is pushed to the brink. Maybe he discovers some great betrayal among his friends and village. So in his rage, he decides to take revenge and starts killing everyone. But this is a very extreme and uncharacteristic concept for the original Naruto character.

One possibility could be that Harry is under some dark magic influence. Maybe he's been corrupted by a powerful and evil spell or artifact that makes him lose his sense of right and wrong, leading him to turn on everyone. Another aspect could be that he's been betrayed so deeply by those he trusted that he snaps and decides to take revenge on everyone, believing they are all against him.

Hero's Prison was a game novel written by Huang Huayi. The plot of this novel was about a prison in the real world that imprisoned the world's top criminals. One day, these criminals were brought to the virtual world's "Hero Prison", where the most legendary heroes and monsters were locked up. Doombringer, Ancient Demon Emperor, Troll Chieftain, Bounty Hunter, and even the powerful God! How powerful would he be if he carried such a prison with him? The novel meets the requirements. I suggest you take a look. I hope you like my recommendation. Muah ~

One possible plot could be that Naruto is somehow corrupted. Maybe he's been influenced by a powerful dark force or a powerful enemy has tricked him into believing that everyone is a threat to the world he wants to protect. So, he decides to take extreme measures and kill everyone to 'create peace' in his warped sense.

In some doomsday novels, many different professions were often involved. Some people might choose to become a warrior to protect themselves and others from the enemy. Others might choose to become a doctor to help themselves and others treat illnesses and injuries. There was also the possibility of becoming a thief in search of wealth and treasures in an apocalyptic society. If everyone could have three classes, the plot of the story might be more diverse.

The Naruto universe would be completely desolate. There would be no more ninja villages, no more clans, and no more shinobi way. It would be a world filled with silence and death.