Well, one possible plot development could be that Harry's use of necromancy attracts the attention of dark forces. They might try to manipulate him into using necromancy for their own evil purposes, thinking he's a kindred spirit. This would put Harry in a difficult position as he has to fight against their influence while also dealing with the new power he has.
In some fanfictions, Harry might use necromancy to bring back important figures like his parents. This could lead to complex emotional and moral dilemmas as he tries to interact with them in a world that has moved on without them.
One great plot development could be that the elemental magic Harry learns is not part of the traditional Hogwarts curriculum. So, he has to seek out hidden mentors or ancient texts. This could lead to him exploring parts of the wizarding world that are long forgotten. As he delves deeper into elemental magic, he might also start to question the limitations of the magic he has been taught so far at Hogwarts.
In the fanfiction, it could be that Harry's learning of Black family magic unlocks a new power within him. This power could be related to his connection with the Black family through Sirius. He may then use this power to fight against the rising dark forces in the wizarding world, in a way that is different from the traditional magic he has been taught.
Well, one possible plot development could be Harry struggling to control his newfound ability at first. He might accidentally change his appearance in embarrassing situations, like during a Quidditch match or in front of his crush. Another could be that he discovers he has a special connection to other metamorphmagi in the wizarding world, leading him on a journey to find out more about his heritage.
Well, he might use soul magic to communicate with the spirits of the dead wizards. It could give him an edge in battles as he might understand the essence of his opponents' souls.
He becomes more brooding. The knowledge of necromancy and the power it brings can isolate him as he realizes it's a power not many understand or accept. So he might withdraw from his usual jovial self.
One interesting plot could be Harry struggling to fit in with the Slytherin ideals at first. He might be constantly at odds with some of the more traditional Slytherin values like pure - blood supremacy. But then he could gradually change the house from within, making his Slytherin peers see that not all Gryffindor traits are bad and vice versa.
In some of these fanfictions, Harry might gain god - like powers and use them to reshape the wizarding world. For example, he could end all forms of dark magic at once. Maybe he uses his newfound divinity to bring back lost loved ones, like his parents, in a way that doesn't disrupt the natural order too much.
In some of these fanfictions, Harry might start exploring the dark art of necromancy secretly. He could be driven by a desire to bring back his lost loved ones, like his parents. This often leads to him having to hide his newfound interest from his friends at Hogwarts, creating a lot of internal conflict as he struggles between what he knows is right and his longing for his family.
One interesting plot development can be that Harry levels up his Occlumency skills to an extraordinary level. This would mean he can not only block Voldemort from invading his mind but also be able to read the minds of others to some extent. This would give him a huge advantage in battles and in uncovering mysteries. For instance, he could use this skill to figure out the true intentions of some of the more ambiguous characters in the wizarding world, like Snape. And it would completely change the dynamics of his relationship with other characters, as they would be more cautious around him knowing he can peek into their thoughts.
In some fanfictions, Harry inheriting a fortune could lead to him having more political power in the wizarding world. He could use this to change laws that are unfair to certain magical creatures or groups. For example, he might fight for the rights of house - elves. He could also use his money to fund research on dark magic prevention, making the wizarding world a safer place.