One possible way in a fanfic could be that there was a misunderstanding. Hagrid might have been accidentally given a poisoned item by Harry that was meant for someone else. But still, it's a disturbing concept as Hagrid is a beloved character. It could also be that the fanfic was exploring a parallel universe where the characters' personalities and relationships are distorted, leading to this tragic event.
The consequences would be far - reaching. Firstly, Harry would be completely ostracized from the wizarding community. His friends would be horrified and would likely turn against him. He would probably be sent to Azkaban for such a crime.
Maybe in that fanfic's plot, there was a misunderstanding that got out of hand. Suppose Harry was framed for something terrible, and Hermione, believing the false evidence, felt that she had to take drastic action to protect the wizarding world from what she thought was a great threat, so she kills him. But later she realizes her mistake.
Maybe Hagrid will teach Harry all kinds of magical creatures in that summer. He could introduce Harry to the hippogriffs, how to approach them safely and gain their trust.
It could be that a powerful wizard in the Harry Potter universe sends Harry to defeat Palpatine for some greater good. Harry's quick thinking and his array of spells like Expelliarmus or the Killing Curse (although he hates to use it) could potentially be used against Palpatine. Since Palpatine is used to dealing with lightsabers and the Force, Harry's magic could catch him off - guard.
In some dark fanfiction scenarios, Vernon might kill Harry Potter out of his extreme hatred and fear of magic. Maybe he discovers Harry's magic in a moment of rage and overreacts, using a weapon or his brute force to end Harry's life. However, this goes completely against the essence of the original series where Vernon was more of a bumbling, non - magical threat.
Well, in a fanfiction world, anything can be possible. Maybe Harry Potter uses his magic skills like the Killing Curse. But it's really a strange crossover. The Joker is from a completely different universe with no magic, and Harry Potter is from a world full of magic. It would be a very unique and perhaps disturbing story to see how Harry Potter overcomes the Joker's chaos and madness with his magic and finally kills him.
One possible reason could be that Sirius, being Harry's godfather, feels it's his right and duty to protect Harry. He might not trust Hagrid fully to keep Harry safe, especially considering the dangerous situation Harry is in. Sirius has a strong connection to Harry and wants to be directly involved in his upbringing and protection.
One possible plot twist could be that Dumbledore was under the influence of a dark magic spell that made him kill Hagrid. And Harry, realizing this, has to find a way to break the spell and clear Dumbledore's name while also dealing with his own grief and anger over Hagrid's death.
To make it believable, the author could explore a dark AU (alternate universe). Maybe in this AU, Draco has been pushed to the extreme by external forces. For example, if his family was in mortal danger and the only way to save them was to eliminate Harry. It would also require a significant change in Draco's character development, showing how he became so desperate.
Well, one possibility is that Naruto would face some serious consequences. Killing is not in his usual nature, so he might struggle with guilt. Also, the Sound Village would likely seek revenge, which could lead to a full - scale war between Konoha and the Sound. Another thing could be that his friends in Konoha might view him differently, some might be afraid of his new - found brutality while others might try to understand his motives.