In the 'harry is adopted by voldemort fanfiction', it could start with Voldemort seeing potential in Harry that no one else does. He takes Harry in and raises him in a very different way than the Dursleys did. Harry might be exposed to a world full of dark magic and Voldemort's grand plans. But as he gets older, Harry's sense of right and wrong, which he got from his parents, starts to surface. He might then try to find a way to use the knowledge he gained from Voldemort to defeat him, while also struggling with the emotional bond that has developed between them, if any.
Well, in this fanfiction, perhaps Voldemort adopts Harry because he realizes Harry has some unique power that he wants to control. As Harry grows up, he starts to understand Voldemort's motives and tries to find a way to break free. He could also form unexpected alliances with some of Voldemort's followers who have a change of heart.
One possible plot could be that Harry is somehow tricked into believing Voldemort's cause is just. Maybe Voldemort uses some powerful magic to distort Harry's perception of good and evil. So Harry starts to help Voldemort in his quest for power, thinking he is doing the right thing.
A third plot twist could involve a character we least expect coming to Harry's rescue. Perhaps a Slytherin student who has been secretly against Voldemort all along. This student could have some inside knowledge about Voldemort's lair and manages to free Harry, leading to a change in the dynamic between the houses at Hogwarts.
In this fanfiction, the relationship between Harry and Voldemort would be full of contradictions. Voldemort adopts Harry for his own purposes, but Harry has his own will. In the beginning, Harry may be forced to follow Voldemort's orders out of fear. As time passes, he might start to question Voldemort's actions and ideology. Voldemort, seeing Harry's growing independence, could become more controlling. This could lead to a cycle of rebellion and suppression in their relationship. Harry may also find some common ground with Voldemort in their shared loneliness or desire for power, which would add more layers to their complex relationship.
In such a fanfiction, Harry might be raised with a very different set of values. Voldemort could try to mold Harry into his own image, perhaps teaching him dark magic. But Harry might also secretly hold on to his own sense of good. For example, he could use the knowledge Voldemort gives him to ultimately turn against him.
The plot might go like this. Harry is adopted by Voldemort and is made to believe that the wizarding world outside is full of enemies. But as he gets older, he discovers the truth about his parents' death and Voldemort's true nature. He then has to struggle with his loyalty to Voldemort who raised him and his sense of justice. He could use his unique position to gather intelligence about Voldemort's plans and eventually turn against him to save the wizarding world.
In this type of fanfiction, Hermione would likely experience a great deal of internal conflict. On one hand, she has her own moral compass which is firmly against Voldemort's ideology. On the other hand, she's in his care. This could lead to her developing a stronger will and a more nuanced understanding of good and evil. Voldemort could develop a strange sort of affection for Hermione, which would be a new aspect to his character. He might be more protective of her than his other followers. And for the other Hogwarts students, they would view Hermione with a mix of fear and confusion. Some might try to rescue her, while others would be too afraid to get involved.
A plot twist might be that when Harry goes to Voldemort, he discovers that Voldemort has a secret weakness. Maybe it's related to his family or some long - forgotten magic. Harry then has to decide whether to use this weakness against Voldemort or try to redeem him. This would add a whole new layer of complexity to the story. Another aspect could be that there are other forces at work, like a third - party wizard who is manipulating both Harry and Voldemort for their own gain, and Harry has to figure out who this is while dealing with Voldemort.
Perhaps in this fanfiction, Harry discovers some dark secret about the Order of the Phoenix or Dumbledore that makes him lose faith in the side he has always been on. This, combined with Voldemort's manipulation, could lead him to side with the Dark Lord. For example, if he finds out that Dumbledore has been using him all along without his full knowledge, he might be so disillusioned that he turns to Voldemort as an alternative.
Well, it could be that in this fanfiction, Harry discovers some long - hidden truth about the wizarding world that makes him realize Voldemort's motives aren't entirely baseless. Maybe there's a prophecy misinterpretation that leads Harry to think they can work together to fix the wizarding world's problems.
Well, one way could be through some dark and misinterpreted magic. Maybe Harry stumbles upon an ancient spell that he thinks will defeat Voldemort once and for all but instead, it backfires and revives him. It could also be due to some sort of interference from a powerful dark object that Harry unknowingly uses in the wrong way.