Perhaps a plotline where Harry's magical abilities are developed in a unique way. Being raised as a pureblood might expose him to different types of magic training or ancient spells that are more commonly known among pureblood families. This could make him a more powerful wizard in different ways compared to his canon self.
Another plotline could be his relationships with other characters. He might have closer ties with pureblood friends and enemies alike. His friendship with Ron and Hermione could be completely different or even non - existent as his upbringing would shape his social group very differently. He may form alliances with pureblood families that have their own agendas, which would lead to a whole new set of adventures and challenges.
One interesting plotline could be how Harry's view of the wizarding world changes. Since he's raised as a pureblood, he might have a different perspective on blood status and the relationships between different wizarding families. For example, he could be more involved in the pureblood social circles and have to navigate the complex politics there.
One popular 'Harry Potter raised by pureblood' fanfiction might be 'The Pureblood Prince'. It often shows how Harry's upbringing in a pureblood family could change his perspective and his relationships within the wizarding world. Another could be 'Raised Amongst the Purebloods', which might explore how different magical traditions influence Harry's development.
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.
In this fanfiction, a possible plotline is Harry's influence on the Weasley family. Since he has his own experiences with Voldemort, he could teach the Weasleys some new defense magic or strategies. Also, the Weasleys' financial situation might change as they take on Harry. They might have to find new ways to support the family with an extra member. And of course, there could be a plotline about how Harry deals with the Weasley parents as his own. Molly Weasley's motherly love could be both a comfort and a challenge for Harry as he grows up in this new family setting.
Well, perhaps in this fanfiction, Harry's snake -raising has given him some special powers related to serpents. For example, he could have the ability to move as silently as a snake or even use some snake -like magic that others don't possess. Also, the story could explore how his relationship with the snakes affects his relationships with his human friends. Maybe at first they're a bit put off, but later come to understand and accept this part of him.
One interesting plotline could be how Harry's personality is shaped differently. With the Marauders' influence, he might be more mischievous and confident. For example, he could learn pranks from them at a very young age and use them to outwit his enemies later on.
One possible plotline could be Harry learning dark magic in Hell but then using it for good in the wizarding world. For example, he might master a powerful spell that can only be learned in Hell to defeat Voldemort once and for all.
Perhaps Harry, being raised by house elves, has a very different view of the wizarding world's social hierarchy. He may see the unfair treatment of house elves as completely unacceptable from a young age and strive to change it. This could lead to him getting into conflicts with some of the more traditional pure - blood families who rely on house - elf labor.
One possible plotline could be Harry being raised by characters from a different magical universe, like the Narnia characters. This might lead to him having a very different understanding of magic and his role in the wizarding world. Another could be if he was raised by characters from a superhero universe, which would likely result in him having some unique combat skills in addition to his wizardry.
One interesting plotline could be how Harry's personality is shaped in a very different way compared to the original series. Maybe he becomes more street - smart and less trusting due to the influence of the'slashers'. Another could be the new magical abilities or skills he might develop under their guidance.
One interesting plotline could be Harry learning unique magic from Firenze. Since Firenze has different perspectives on magic compared to human wizards, he might teach Harry some ancient or forgotten spells. Another could be Harry's relationship with the centaurs. He might have to navigate their complex society and politics while being raised by Firenze, which could lead to all sorts of adventures and conflicts.