Well, it could be about Harry in a scenario where he has some sort of connection or transformation related to death. Maybe he gains powers associated with death, or he has to face death in a very different way than in the original story. It might also involve his interaction with death - like seeing death as a character or concept in a new light.
Obviously, Harry would be one of the main characters. Since it's about him becoming death, he's at the center of it. There might also be his friends like Hermione and Ron. They could be reacting to Harry's transformation, either trying to help him or being afraid of the change in him.
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.
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.
Hermione would surely be one of the main characters interacting with Harry. She would be both intrigued and cautious about his new status. She might help him research and understand the full implications of being the master of death.
Sure, in the realm of fanfiction, the possibilities are endless. The 'Harry Immune to Death' concept could stem from a desire to explore what would happen if Harry had some sort of invincible quality. It could change the entire plot of the original story. Maybe it's a result of a powerful spell, a special inheritance, or a new magical ability. You can start your search by using relevant tags on fanfic platforms.
In such a fanfiction scenario, it would completely颠覆 the original story. Harry would be on the side of evil, which means he might be involved in dark magic practices and attacking those he once considered friends and allies. It would be a very dark and扭曲的 version of the Harry Potter universe.
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.
Probably not. The idea of Harry being beaten to death by the Dursleys is extremely dark and goes against the general spirit of the Harry Potter series. Most fans are more interested in positive, adventure - filled, or character - development - centered fanfics.