One common trope is the redemption arc of Voldemort. In these fanfics, he goes from being the evil Dark Lord to a more caring figure. Another is Harry's struggle with his past abuse and how he slowly heals with Voldemort's new - found kindness.
In many of these fanfictions, there's the trope of the 'found family'. Harry, who has been abused, finally finds a sense of family with Voldemort, and this new family dynamic is explored in depth. There are often scenes of Voldemort protecting Harry from those who once abused him, and Harry learning to trust and love Voldemort as a father - like figure. This also sometimes involves the re - evaluation of other characters in the Harry Potter universe in relation to this new family unit.
Yes, there are some fanfictions with this concept. It's an interesting take on the Harry Potter universe as it flips the typical relationship between Harry and Voldemort. In these fanfictions, the story often explores how Voldemort's actions change when he takes on the role of an adoptive figure to Harry, who has been abused. It can lead to some really unique character developments and plot twists.
One popular one might be 'Voldemort's New Heir' where Voldemort discovers Harry's abused situation and decides to take him in for his own purposes. He starts to train Harry in dark magic, but an unexpected bond forms between them.
Another option is to ask other Harry Potter fanfiction enthusiasts. You could join some Harry Potter - related forums or groups. There are usually experienced readers who have a wide range of knowledge about different types of fanfictions. They might be able to point you in the right direction and tell you about some great stories with this particular plot.
Often, Voldemort starts as this purely evil figure. But when he adopts Harry, he begins to show some unexpected softness. For example, he might start to protect Harry from other threats, which is very different from his usual self.
One possible plotline could be Harry initially being very distrustful of Voldemort, but as time goes on, he starts to see a different side of him. Voldemort, on the other hand, might be trying to use Harry for his own purposes at first but then develops a real bond. Another could be that Voldemort has to face the wizarding world's reaction to his newfound role as Harry's protector, which could lead to conflict. And Harry could grow to become a powerful ally to Voldemort in a new way, changing the power dynamics in the wizarding world.
A frequent theme is the re - imagining of the magical world. With Voldemort in a different role as an adoptive father, the power dynamics in the wizarding world change. Also, the theme of identity is prominent. Fem Harry has to figure out who she is in this new situation where she is associated with Voldemort. And there's often the theme of moral ambiguity as she may be exposed to dark magic yet still hold on to her own sense of right and wrong.
Well, the theme of protection is quite prevalent. Sirius is very protective of Harry in these fics. Also, the theme of discovery. Harry discovers a new side of the wizarding world through Sirius. And friendship is also a big part. Harry makes new friends as he starts a new life with Sirius. These themes together create a rich and engaging story.
A possible plot could be that Voldemort adopts Harry after seeing a prophecy that Harry is the key to saving the wizarding world in a different way than just defeating him. So, Voldemort decides to raise Harry in a way that will make him a powerful ally. They go on adventures together, facing ancient magical threats that neither could face alone, and along the way, they form an unlikely bond.
The redemption trope can also be found in some of these fanfictions. Voldemort might start to change his ways because of his relationship with Fem Harry Potter. It's an interesting take as it goes against his established character in the original series. And then there's the trope of the hidden identity. Fem Harry Potter could be hiding her true nature from Voldemort, which adds suspense and mystery to the story.
Perhaps Voldemort adopts Hermione with an ulterior motive at first, like using her intelligence to further his own dark plans. But as he spends time with her, he starts to develop a strange sort of paternal feeling. Hermione, on her part, could try to subtly change Voldemort's views. She might introduce him to the value of Muggle - born magic and the importance of equality, which could gradually make Voldemort question his own pure - blood supremacist ideology.