In such a fanfic, one possible reason could be extreme depression. Maybe he faced overwhelming losses like the death of his closest friends and felt he couldn't go on. Another reason might be that he was under some kind of dark magic influence that made him lose his will to live.
Perhaps in the 'harry kills himself fanfic', he was burdened by the great expectations placed on him. Everyone saw him as the savior, and the pressure became too much. He might have thought that by ending his life, he could escape all the responsibilities and the constant danger he was in.
One possible reason could be extreme despair. Maybe in that fanfic's alternate universe, Harry has lost all his friends and loved ones in a very tragic way, like a second wizarding war that was far more brutal and unforgiving. He might see no way out of the emotional pain and thus choose to end his own life.
One possible reason could be extreme despair. Maybe he faced some overwhelming challenges or betrayals that made him feel there was no way out. For example, if he lost all his friends and felt completely alone in the world of the fanfic.
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.
Well, in such a fanfiction, it could be due to a combination of factors. His isolation in Grimmauld Place might have taken a huge toll on his mental state. He might have felt like a burden to his friends, especially Harry. And the lack of any real future prospects, given his fugitive status and the ongoing battle against Voldemort, could have pushed him over the edge into taking his own life.
Creative exploration. Some writers might want to see how the story would change if Harry had a darker side.
Well, some writers might be interested in exploring alternate timelines or universes. In a different reality, they might think that Harry could be influenced by dark forces in such a way that he would do something as horrible as killing his parents. It could also be a form of creative rebellion against the established story. They want to break the rules and see where it takes them. And maybe, for some, it's a way to deal with complex psychological concepts, like how a person can lose their moral compass completely.
One possible reason could be heartbreak. If Harry was deeply in love with Hermione and she chose someone else, like Ron, the pain of rejection could be too much for him to handle. Another reason might be if Hermione betrayed Harry in some way, like revealing his secrets to the enemy. This sense of betrayal could shatter his trust and push him to the edge.
Some writers might do it for shock value. They want to create a very different and extreme take on the character to get a strong reaction from readers.
One possible reason could be a misdirected spell during a battle. In the heat of a fight, Harry's spell could go awry and accidentally kill Malfoy. Another reason might be if Malfoy was under the control of a dark wizard and was about to do something truly terrible, and Harry had to stop him at all costs, including taking his life.
One possible reason could be extreme self - blame. Batman might cut himself as a form of self - punishment for his failures in protecting Gotham. For example, if a major villain caused great harm despite his efforts, he could turn that guilt inward.