One possible plotline could be Harry struggling to come to terms with his unique parentage. He might face discrimination or fear from others in the wizarding world who don't understand. Another could be his relationship with Death. Maybe Death has certain tasks or lessons for Harry that he must fulfill or learn. And also, his friends' reactions to this revelation would be interesting. Hermione might be eager to research about it while Ron could be a bit more skeptical at first.
Well, in some 'Harry is Dean's son fanfiction', a cool plotline could be his discovery of magic. Since Dean is a half - blood wizard, Harry might have a different experience learning about magic at home. He could be more exposed to the wizarding world's cultural aspects earlier. Also, his friendships might form in a unique way. For example, he could be closer to the Gryffindor students from the start because of his father's house.
One possible plotline could be that Harry gains unique powers or abilities from being raised by Death. For example, he might have an enhanced understanding of life and death magic, which gives him an edge in battles against dark wizards. Another plotline could involve his relationship with other characters being drastically different. Since he's raised by Death, he might be more isolated from his peers at Hogwarts, leading to a complex web of friendships and rivalries.
One possible plotline could be that Harry discovers new magical abilities related to the concept of death. For example, he might be able to communicate with the spirits of the dead in a more profound way than just using the Resurrection Stone. Another could be that his friendship with 'death' gives him a unique perspective on life and sacrifice, leading him to make different choices in his battles against Voldemort.
One interesting plotline could be the transformation of a character into Death's Knight and how they struggle with the new powers and the dark nature it might bring. For example, they might have to fight against their own former friends who now see them as a threat.
One interesting plotline could be the backstories of the Death Eaters. Maybe exploring how they were recruited by Voldemort, like Bellatrix's extreme loyalty and what led her to that. Another could be their interactions outside of the main battles in the original series. For example, how they deal with the power struggles among themselves when Voldemort is not around.
One interesting plotline could be Harry's struggle with his new identity. Since Hades is the god of the underworld, Harry might face discrimination or fear from others in the magical world. He could also have unique powers related to death and the underworld, like being able to communicate with the dead more easily. Another plotline could involve his relationship with his father Hades. Hades might try to groom Harry to take over some of his underworld duties, while Harry is conflicted because he also has a life in the wizarding world he doesn't want to abandon.
One interesting plotline could be a deeper exploration of the Hallows' true powers. Maybe the characters discover new ways to use the Elder Wand, Resurrection Stone, and Invisibility Cloak that J.K. Rowling didn't fully explore in the original series. Another could be a different take on the final battle against Voldemort, with the Hallows playing a more complex role.
One possible plotline could be that Harry discovers a way to communicate with Death as an entity. Maybe he stumbles upon an ancient magic that allows him to have conversations with Death. Through these interactions, he gains a deeper understanding of life and death, and this new knowledge helps him in his battles against Voldemort. For example, Death could give him insights into the Horcruxes and how to destroy them more effectively.
In the fanfiction, it could be that Harry's friendship with Death is a secret known only to a few. He has to hide it from most of the wizarding world because they would not understand. This secrecy could add a lot of tension to the story. For instance, when strange things start to happen around Harry, like people seeing shadowy figures or experiencing unexplained chills, some might suspect dark magic. But in reality, it's just a side - effect of his connection with Death. Harry would have to struggle to keep his friendship a secret while also using the knowledge he gains from Death to protect his friends and the wizarding world.
A possible plotline could be the apprentice's journey to understand the true nature of death. In the fanfiction, they could be on a quest to find out the secrets behind the veil in the Department of Mysteries. Along the way, they encounter various challenges and make new allies, all while trying to master their role as the apprentice of death.