Well, in such a fanfiction, perhaps the Famels introduce Harry to a whole new world within the wizarding world that we haven't seen in the original series. It could be a place with different magical creatures and spells that shape Harry in a new way. For example, they might teach him a more ancient form of magic that gives him an edge over his foes in Hogwarts.
Obviously, Harry Potter is a main character. And the Famels, though we don't know exactly who they are in this context yet, are also central.
One interesting concept could be the moral and ethical dilemmas Harry would face. Growing up with Voldemort as his guardian, he might be torn between the dark teachings and his own inner sense of good. Another could be his relationships with the other Death Eaters. He might form strange alliances or rivalries within that dark circle.
One interesting concept could be how Harry's character might develop differently. If he's raised by a 'predator' in the fanfiction sense, perhaps he'd be more cunning or have a different moral compass. For example, he might learn survival skills in a harsher way than in the original series.
The world - building in 'Harry Potter Raised by Devils' fanfiction can be really fascinating. The setting could be a darker Hogwarts, with devilish influences everywhere. The rules of the school might be twisted. For instance, instead of the houses promoting unity and friendly competition, they could be more about power struggles among different devil - influenced groups. Also, the role of the teachers would be different. Some might be in league with the devils, and Harry would have to navigate this treacherous environment.
One interesting concept could be how Harry's magic might be influenced by growing up with werewolves. His view of the wizarding world might also be very different, perhaps more in tune with the wild and untamed nature of werewolves.
Some fanfictions in Harry Potter 2 might play with the idea of the basilisk having different powers or weaknesses. It could also explore the idea of a hidden connection between Ginny and the Chamber of Secrets that goes beyond what was in the original story. There might be fanfictions that change the role of certain characters, like making Neville a more central figure in solving the mystery of the Chamber.
One interesting concept could be exploring more about the Marauders' time at Hogwarts. Fanfiction might expand on their adventures, like pranks they played that were never mentioned in the original book. Another could be different interpretations of Sirius Black's escape and his relationship with Harry during that time.
One interesting concept could be the idea of Spongebob visiting Hogwarts. Imagine him in his square pants, trying to fit in among the wizards and witches, getting into all sorts of comical misadventures in the halls of Hogwarts, like accidentally turning the Great Hall into Bikini Bottom with his nautical nonsense.
Another concept could be mechas that are powered by magic crystals instead of traditional energy sources. These crystals could be mined from magical caves in the Harry Potter universe. The mechas could also have spells inscribed on their armor for added protection or offensive capabilities. For instance, a mecha might have a spell that repels dark magic attacks, which is activated when an enemy's dark magic - based weapon is aimed at it.
In Harry Potter cyborg fanfiction, there might be the concept of a cyborg Quidditch player. This player could have mechanical wings for faster flying or a built - in broomstick control system for more precise maneuvers. There could also be a story where Voldemort creates cyborg Death Eaters with enhanced dark magic capabilities through mechanical implants. And then there's the possibility of a cyborg Hagrid, with a mechanical arm strong enough to handle the most dangerous magical creatures.