The exploration of the dark side of magic is also a theme. We get to see how the dark side can be so alluring. In these fanfictions, Harry may start to explore spells and powers that he would never have considered before. And the theme of betrayal is often there. Harry might feel betrayed by the wizarding world that he once fought for, which makes it easier for Voldemort to turn him.
One way it could be plausible is through the use of dark magic manipulation. Voldemort is a master of dark magic. He could perhaps use some form of mind - altering spell on Harry. If he managed to get Harry in a vulnerable state, like when he was feeling isolated or betrayed, the dark magic could seep in and start to change his nature. For example, if Voldemort made Harry believe that his friends at Hogwarts had turned against him, Harry's sense of justice and goodness might be warped, leading him to the dark side.
Common themes include the exploration of dark magic. If Harry is Voldemort, he would be more involved with dark magic, so the fanfictions often show his journey into that world. Also, the theme of redemption might be present. Even though he's in the form of Voldemort, he might try to atone for Voldemort's past deeds. And there's always the theme of how the wizarding world reacts to this strange transformation of Harry.
Obviously, Harry himself is the central character. Hermione and Ron are also often present. In some stories, they try to save Harry from the darkness, while in others, they become his enemies as he turns dark. Dumbledore may also play a significant role, either trying to guide Harry back to the light or being unable to stop his descent into darkness.
One common theme could be redemption. Maybe the story shows voldemort changing through his relationship with harry. Another theme might be the power dynamics, as both are very powerful in different ways.
One common theme is redemption. Voldemort might be redeemed through his love for Harry. Another is the power of love to change destinies, as their relationship goes against all odds.
A frequent theme is the exploration of a different kind of relationship. Since Voldemort is now female, it could lead to a more complex emotional and psychological relationship with Harry. Also, the theme of identity is common. How does a female Voldemort view herself compared to her male counterpart? And how does Harry react to this new version of his arch - enemy? These are often explored in such fanfiction.
Power is a common theme. Fanfictions often explore how Voldemort amasses and uses his power, and how others react to it. For example, some stories might show characters trying to resist his power grab.
The common themes in 'harry is in love with voldemort fanfiction' are quite diverse. There's the theme of acceptance, as they have to accept each other despite their differences. Forgiveness is also there, as Harry might have to forgive Voldemort for all his wrongdoings. And there's the overarching theme of defying the norm, as this relationship goes against the normal expectations in the Harry Potter world. These themes make the fanfictions thought - provoking and unique.
The theme of identity is often present in 'harry marry voldemort fanfiction'. Both Harry and Voldemort have to re - evaluate who they are in the context of their relationship. Another common theme is the struggle against society's norms. Since their relationship is so unorthodox, they face a lot of opposition from the wizarding world. This struggle adds depth to the story and shows how their love can be strong enough to withstand external pressures.
One common theme is power struggle. Since Harry has his own power and Voldemort is power - hungry, there will be a constant fight for control over Harry's abilities. Another theme is the loss of innocence. Harry, being in such a dark situation, would surely lose his naivete quickly.