Well, it could be a story where Harry is tricked into believing that Muggles are responsible for some great harm to his loved ones in the wizarding world. So, in his rage and misdirected sense of justice, he starts targeting Muggles. But this is a very un - Harry - like behavior as the real Harry is all about protecting the innocent, whether they are wizards or Muggles.
One possible consequence could be chaos. Muggles would be both terrified and fascinated. Governments might try to control or study the magic, leading to a power struggle. The wizarding world's secrecy, which has been maintained for centuries, would be shattered, and wizards would have to face the fact that their world is now exposed to those who don't understand magic.
The original Harry Potter series is based on themes of love, friendship, and the co - existence of wizards and Muggles. In the 'Harry Potter kills Muggles' fanfiction, it completely goes against this by having Harry, who is a symbol of good in the original, become a murderer of Muggles. This is a huge deviation from the core values of the series.
In such fanfiction, Muggles can be shown in different lights. Some portray them as simple and uncomplicated, living their ordinary lives without any knowledge of magic. However, there are also fanfictions where Muggles are more curious or even a bit envious of the magical abilities of Wizards. They might be depicted as trying to find out about the wizarding world despite the secrecy.
Well, it could be that he has lost all hope. In the fanfiction world, if the situation becomes so dire that he sees no way out for himself or the people he loves. For example, if Voldemort manages to gain complete control and Harry Potter thinks his sacrifice by taking his own life might be the ultimate solution to break Voldemort's power. He might also be suffering from post - traumatic stress after all the battles and losses, leading him to this extreme decision.
The wizarding world would likely be in a state of shock and then celebration. People would start to see Azkaban in a new light, perhaps no longer as just a place of horror but also as the site where the great evil was finally vanquished.
He might gain more respect from his peers. After all, killing the Basilisk is no small feat. His friends would probably look up to him even more, and his reputation in Hogwarts could soar. He could also become a bit of a legend among the younger students.
Some muggles in fanfiction could be the relatives of a half - blood wizard. These muggles might have a hard time understanding their wizarding family member's abilities at first. They could be initially skeptical or even scared when they witness magic. However, as the story progresses, they might come to accept and even be in awe of the wizarding world.
One implication could be that it allows muggles to further immerse themselves in the magical world of Harry Potter. Fanfiction often explores different aspects of the existing story, so muggles can get new perspectives on the characters and events. It also shows the popularity and wide - reaching influence of the Harry Potter series that even non - magical people are so interested in exploring it further through fan - created works.
One possible reason could be a misinterpretation of his character. In the original series, Harry Potter doesn't hate Muggles at all. But in this fanfic, perhaps the author wants to explore a 'what if' scenario where something drastic has happened to make him have such feelings. Maybe he's been betrayed by a Muggle - in the fanfic world, this could be a made - up situation that sours his view on all Muggles.
In a more complex scenario, Bellatrix could be trying to use a dark magic ritual that would cause great harm to the wizarding world. Harry discovers her plan and has to engage her in a magical struggle. In the process, he manages to turn her own dark magic against her, which results in her death. This would show Harry's ingenuity and his ability to use the enemy's own weapons against them.