Definitely not. Even though it's fanfiction, the idea of Harry killing people goes against the general image of the character in the original works. It can be disturbing and not something that should be accessible to all. For example, young children who are fans of Harry Potter are likely to be shocked or scared by such a concept.
Some writers might want to explore the darker side of the character. They could be curious about how Harry would be if he was pushed to his limits and had to kill in self - defense or to protect others in a very extreme situation.
Yes, it can be. The idea of a character like Harry, who is generally seen as a hero, being portrayed as a killer goes against the core essence of the original character in many ways. It might be disturbing to some fans who love the positive image of Harry from the original works.
There could be. Fanfiction is a platform for fans to experiment with different plot ideas. Since there is a lot of tension between Harry and Lucius in the original books, some writers may have been intrigued by the idea of Harry killing Lucius. You can search on popular fanfiction websites to see if such a story exists.
In the fanfiction, there could be a range of consequences. On one hand, he could be seen as a hero by his fellow students. They might admire his bravery and his ability to take on a dangerous troll. However, the teachers may be more cautious. If Harry used excessive force or magic that was not in line with the school's code of conduct, he could be given detention or even face a disciplinary hearing. Also, depending on how the troll was killed, there could be some magical fallout. For example, if he used a very dark spell, it could have an effect on his own magical core or his relationship with magic in general. Moreover, the death of the troll might also attract the attention of other dark creatures or forces that were somehow related to the troll, putting Harry in further danger.
One consequence could be that he becomes a hero among his peers. Everyone in Hogwarts might look up to him even more. The other students could see him as a real dragon - slayer, which gives him more popularity and respect.
After Harry kills Voldemort in the graveyard in the fanfiction, the magical balance might shift. With Voldemort gone, some of the dark magic that was prevalent might start to fade away. The Hogwarts School of Witchcraft and Wizardry could see a new golden age. New spells and magical theories might be explored as the fear of Voldemort no longer holds back the wizarding scholars. Harry himself might start to travel around the world to spread the news of Voldemort's defeat and also to learn more about different types of magic. His friends would also have new opportunities, like Hermione might be able to further her studies without the constant threat of Voldemort and Ron could finally relax and enjoy a more peaceful life at the Burrow.
One consequence could be that he becomes a hero among the wizarding community. People start to look at him with even more admiration and respect. His reputation as a powerful wizard grows even stronger.
Yes, there might be such fanfictions out there. However, in the original 'Harry Potter' series, Harry is not a murderer. Fanfictions that explore this dark concept often deviate from the canon to create alternate, usually more extreme, storylines. Maybe it could be set in a scenario where Malfoy has gone extremely dark and Harry, out of a sense of justice or self - defense, takes such a drastic step. But this is completely against the moral and ethical framework of the original series.