The main character, Chen Yan, was reborn as a mosquito after his death and obtained the "Infinite Evolution App." He began a path of revenge and eventually became a local god. I hope you like this fairy's recommendation. Muah ~😗
In this fanfiction, Harry might become death in a symbolic sense. He could be the one who decides the fates of others, like a sort of Grim Reaper figure in the wizarding world. He might gain the power to see the life threads of people and has to make difficult choices about whether to cut them or not. This would put him in a very complex moral situation, as he has always been a hero who tries to save lives, but now he has this power that is closely related to ending lives.
In some fanfictions, if Percy Jackson becomes Death, he might gain the power to decide the fates of all beings. He could be seen as a very solemn and powerful figure, no longer the carefree demigod. His relationships with other characters would also change drastically. For example, his friends might fear him at first, but then come to understand his new role and the importance of it in the grand scheme of things.
It could be Voldemort still. Even if Harry becomes associated with death, Voldemort is the ultimate symbol of death and destruction in the wizarding world. Their battle could take on a new dimension as Harry now has a different relationship with death.
Seven Hundred Years After Death: Starting from the City God's Sign In was a book about the protagonist becoming a City God after his death. The sign in system was in his hands, protecting the people and continuing the good deeds. I recommend this novel to you. I hope you like my recommendation.😗
In such a fanfiction, Harry Potter might start to embrace the Dark Arts. He could abandon his friends at Hogwarts and join forces with Death Eaters. His actions would likely shock the wizarding world, and he would become a hunted figure by those who still oppose Voldemort and his followers.
One possible plot could be that Harry is manipulated by a powerful dark force. Maybe Voldemort manages to find a way to break Harry's spirit through a series of cruel and deceptive events. For example, Voldemort could use false visions to make Harry believe that the Order of the Phoenix has betrayed him. Then, Harry, feeling lost and angry, starts to be drawn to the Death Eaters' ideology which offers him a sense of power and belonging that he thinks he has lost on the 'good' side.
The wizarding world would be in chaos. Harry has been seen as the 'Chosen One' to defeat Voldemort. If he becomes a Death Eater, the hope that the wizarding world has placed in him would be shattered. People would lose faith in Dumbledore's judgment for believing in Harry all this time. The Order of the Phoenix would be severely demoralized as they have been fighting for Harry's cause.
Wakaka, it sounds like a very interesting novel! Little Fairy has a novel here called "Portable Space: Reborn Female Immortal Cultivator". It's a modern romance and urban supernatural novel. The protagonist, Su Huaining, was reborn after his death. His background was mysterious, and after a thousand reincarnations, he finally came to fruition. She also had a spatial spirit that could help her solve many problems. Not only that, Su Huaining also had a cold, ruthless, and heartless male lead, and some romantic feelings had developed between the two of them. There were also mysterious races and astonishing willpower in the novel. The protagonist, Su Huaining, used his own strength and wisdom to become one of the best in the cultivation world step by step. I hope you like my recommendation. Muah ~