One possible plotline could be that Harry grows up with a very different set of values. Since Lucifer is often associated with rebellion and a certain kind of dark knowledge, Harry might be taught to question authority in a more extreme way than in the original series. He could also have some very unique magical abilities that are influenced by Lucifer's nature, perhaps abilities related to darker forms of magic.
Well, the story might show Harry having a much more conflicted relationship with the wizarding world. Growing up with Lucifer, he may not see the good - evil dichotomy in the same way as other wizards. Maybe he'd try to bring about a new order in the wizarding world, one that blurs the lines between what is considered good and bad magic. He could also have a very different group of friends or allies, those who are attracted to his unorthodox upbringing.
If Harry was raised in Japan, he could grow up in a world where magic is intertwined with Japanese mythology and culture. He might study at a Japanese wizarding school. His upbringing would expose him to things like Japanese magical creatures, which could be different from those in the UK. He could also have a different set of values instilled in him due to the Japanese cultural influence.
One possible plotline could be that Harry's grandfather imparts unique magical knowledge to him that he doesn't get at Hogwarts. Maybe it's an old - fashioned kind of magic that has been forgotten over time. This could give Harry an edge in dealing with the dark forces.
One possible plotline could be her discovery of magic in the dark and chaotic environment of Arkham. Maybe she has to hide her magic from the more sinister characters there. Another could be her forming an unlikely alliance with some of the inmates who have a sense of justice, and together they help her escape Arkham to find her place in the wizarding world.
Well, perhaps Harry would be more isolated in this fanfiction. Since Greyback is a feared werewolf, other magical beings might avoid Harry. This could lead to him developing a very self - reliant nature. He might also have a different view on magic. Instead of using it for good in the traditional sense, he could use it more for survival and protection, which would put him at odds with some of the more morally upright characters in the Potterverse.
One possible plotline could be that Harry discovers his celestial nature and has to learn to control his newfound powers. He might face challenges from both the wizarding world, who are suspicious of his new abilities, and the celestial realm, where there could be those who oppose his presence.
One possible plotline could be that Harry's horns are seen as a sign of great power in the wizarding world. Some might see him as a prophesied savior in a different way than in the original story. The Dark forces may either try to use him or destroy him because of this unique feature.
One possible plotline could be Harry coming to power after a great war in the wizarding world. He then has to deal with rebuilding and unifying the different wizarding communities under his rule as emperor. He might face resistance from some traditional wizarding families who don't want to accept a new form of government.
In a 'Harry Potter is an assassin' fanfic, the plot could start with Harry being trained by an unknown and powerful wizard who has his own motives for creating an assassin out of Harry. This trainer could be someone from a far - off land or an ancient order. Harry then starts taking on targets within the wizarding world that are supposedly 'evil' but as he delves deeper, he realizes that things are not as black and white as he was told. His friends start to notice his strange behavior and he has to either come clean or keep lying to them. As the story progresses, Harry might have to make some tough choices between his loyalty to his friends and his new - found assassin duties, all while uncovering secrets about the wizarding world that were previously hidden.
Maybe it's for a school play at Hogwarts. Harry is chosen to play a female character and has to wear a dress. His friends Ron and Hermione have different reactions. Ron might tease him at first but then support him when he sees how serious Harry is about doing well in the play. Hermione, on the other hand, helps him with his lines and how to act in the dress.
Well, perhaps the plot could center around Percy's journey to discover his true self and his purpose. Nyx, being his caregiver, might have her own motives for raising him. Percy could be on a quest to find out if Nyx has some grand plan for him. Along the way, he would encounter various challenges. He might have to battle creatures that are native to Nyx's domain. His powers would evolve in unique ways. For instance, he could have the ability to communicate with nocturnal animals or control the night itself in some small ways. His relationship with Nyx would also be complex, with moments of love and respect, but also times when he questions her actions and decisions.