Another interesting plot could involve a conflict between the wizarding world and the underworld. Since Harry is known in the wizarding world, his connection to Hades might create suspicion and fear. He could be forced to prove that he doesn't have malicious intentions towards the wizards while also trying to understand his place in the underworld.
A third plot idea is a journey of self - discovery for Harry. As Hades' son, he may have a different destiny than he thought. He could embark on a quest to find out more about his father's side of the family, meeting various underworld creatures and gods along the way. This would not only be a physical journey but also an emotional and spiritual one as he grapples with his new identity.
One plot idea could be Harry discovering his true parentage and having to deal with new powers that come with being Hades' son. He might struggle to control the power of the underworld, like being able to summon the dead or manipulate shadows.
One idea could be that Harry discovers his unique powers as Hades' grandson. He might be able to control the shadows in a way that no one else can. For example, he could use them to travel quickly between places or hide from enemies. Another plot could involve him having to deal with the other gods and goddesses who are either jealous or afraid of his potential. He may also have to prove himself worthy to his grandfather Hades, who has high expectations for him.
One idea could be Percy having to navigate the Underworld politics due to his relation to Hades. He might face challenges from other underworld creatures who don't trust him. Another could be Percy using his newfound powers as the son of Hades to fight against an ancient evil that threatens both the mortal and underworld realms. Or perhaps he has to deal with the stigma of being Hades' son in the demigod community and prove himself worthy.
Another plot could involve Percy's relationship with his father, Hades. Maybe Hades has some grand plan for Percy that he doesn't fully understand at first. Hades could be trying to use Percy to gain more power in the world of the gods, but Percy resists and has to fight against his father's wishes while also dealing with the internal conflict of not wanting to completely turn his back on his family.
A possible plot could involve a magical object that has connections to both the Harry Potter world and the realm of Hades and Persephone. For example, a magical flower that can only grow in the underworld but has the power to heal the most deadly of curses in the wizarding world. Harry, along with Persephone and Hades, has to protect this flower from those who would use it for evil.
Another plot could be Percy discovering a long - lost relative among the children of Hades. This relative has some sort of power or knowledge that could change Percy's understanding of his own identity and his place in the demigod world. It could lead to a journey of self - discovery for Percy as he navigates this new family connection within the dark and often misunderstood realm of Hades.
A plot could revolve around the son of Hades having to face a new and powerful monster that is specifically targeting him because of his heritage. This would lead to a series of adventures where he has to use his unique powers from Hades to survive and protect his friends. For example, he might be able to control the undead in new and unexpected ways to fight this monster.
Well, a plot could involve Harry having to deal with the memories and legacies of both his fathers. He might discover hidden secrets about James and Sirius that were kept from him. Maybe he uncovers a powerful magic that they were working on together before they died. Also, the relationship between Harry and his friends could change. Hermione might be more intrigued by the new historical and magical implications of his parentage, while Ron could be a bit jealous at first but then come to embrace it as part of Harry's identity.
A third plot idea is that Harry's connection to Regulus Black affects his relationship with Sirius. Instead of being his godfather, Sirius could be more of an uncle figure. And Harry could be more involved in the Black family affairs. He might learn about the family's dark secrets and try to redeem the family name. This could involve dealing with the Black family's old enemies and allies, and Harry would have to navigate this complex web of relationships while still being the Chosen One.
A possible plot could be that Harry's powers are not like the normal wizarding powers. Instead of using a wand in the traditional way, he might be able to draw on the power of Thanatos and Hecate in more instinctive ways. For example, he could use his connection to Thanatos to temporarily halt the aging process of an injured creature or use Hecate's power to create powerful illusions that are not just visual but can also affect the mind. This would make him a target for dark wizards who want to use his powers for their own evil ends, and he has to fight to keep his powers safe while also learning to control them.
A possible plot idea is that Harry discovers secrets about his father's side of the family. He could find out about Gideon Prewett's unfulfilled quests or his relationships with other magical families. This could lead him on a journey to complete something his father started. Also, his magical abilities might be affected. He could have a natural affinity for certain spells that were unique to the Prewett family, which could set him apart from the original Harry Potter in the books.