One common element is the moral ambiguity of the necromancer. Are they good or bad? In many stories, they are seen as evil, but some stories explore their potential for good. Another element is the use of ancient spells and rituals. These are often used to perform necromancy. The presence of a supernatural threat is also common. It could be a powerful undead creature that the necromancer has accidentally unleashed or a rival necromancer causing trouble. And, of course, there's always the sense of the unknown and the fear that comes with dealing with the dead.
One common element is a sense of isolation. Necromancers are often outcasts in society due to the dark nature of their magic. Another is a thirst for knowledge or power that drives them to explore necromancy in the first place. For example, they might be rejected by other mages and seek their own path through the forbidden art.
One common theme is redemption. The necromancer, often seen as an outcast in normal society due to their powers, tries to prove that they can use their abilities for good and be redeemed in the eyes of others. Another theme is the balance between life and death. They understand that their actions of raising the dead can disrupt this balance, so they are very cautious about when and how they use their powers.
One unique element is the new power set for Naruto. Instead of just his regular ninjutsu, he has necromancy. This allows him to interact with the dead in ways that are not possible in the original story. For example, he can raise the dead for information or to fight for him.
One common theme is the struggle between the dark nature of necromancy and love. Since necromancy is often associated with death and the undead, it creates a contrast with the life - affirming nature of love.
The concept of the afterlife is another common theme. Since necromancers deal with the dead, the nature of the afterlife, whether it's a peaceful place or a place of torment, and how necromancy affects it are often delved into. It might be that the dead are not supposed to be brought back, and doing so has consequences not only for the living but also for the dead's eternal state.
One common theme is the struggle for acceptance. Since necromancy is often seen as a dark art in the Harry Potter world, Harry usually has to face a lot of opposition from the wizarding community. Another theme is the exploration of power. Harry has to learn to control his new necromantic powers and not let them consume him.
A common theme is the exploration of dark magic. Since the female necromancer deals with the dead, it often leads to stories exploring the boundaries of acceptable magic in the Harry Potter universe. For example, how necromancy is viewed and the consequences of using such dark arts.
Another theme is the idea of the 'forbidden'. Necromancy is often seen as something dark and taboo in these stories, and a romance with a necromancer is also considered forbidden, which adds to the tension and allure.
One common theme is the struggle against prejudice. Since Hermione is a Gryffindor in the original series, in these fanfictions as a Slytherin, she has to face the existing biases towards Slytherin house. And with her necromancy abilities, there's often the theme of the ethical use of such dark magic.
Power and its consequences. Necromancers often gain great power by controlling the undead, but this comes with a price. They are usually shunned by society, so there's a theme of isolation.