Well, in such fanfiction, it's fascinating to consider how Voldemort's view of Harry might shift. He might see Harry's memories of facing challenges and growing stronger through them. This could either make Voldemort more determined to defeat Harry as he realizes his strength, or it could potentially make him more hesitant as he sees the full scope of Harry's experiences.
One interesting aspect could be the exploration of Lily's perspective on Snape's past. It might show how she reacts to his hidden feelings, his difficult childhood, and his complex relationship with the wizarding world. For example, she might gain a new understanding of his loyalty to Dumbledore and his true motives.
One interesting aspect could be the power dynamic shift. If Harry is Voldemort's familiar, it completely changes their relationship from the original series. Harry might gain insights into Voldemort's dark magic in a very different way compared to just being his enemy. Also, it could lead to some unique character developments for both of them, as they would be forced to interact in a much more intimate and complex way than in the books.
In the original story, Voldemort doesn't have access to Harry's memories in this way. So in the fanfiction, it creates a completely new scenario. It allows for a different kind of exploration of their relationship. Instead of just their physical and magical battles, we get to see a more psychological interaction.
One interesting plot twist could be that Voldemort actually has a change of heart. Maybe in the fanfiction, he realizes the futility of his dark ways after seeing the strength of Harry's love and friendship. Another could be that Harry discovers a new, unexpected power within himself that is not related to his typical Gryffindor courage or his connection to Voldemort's soul pieces. For example, he might find he has the ability to manipulate time in a way that gives him an edge in the battle.
One interesting aspect could be exploring Snape's unrequited love for Lily in more depth. Fanfiction might delve into his innermost thoughts and feelings during their time together at Hogwarts.
One interesting aspect could be the exploration of Percy's past experiences that were not fully covered in the original work. For example, his early days of training might be delved into more deeply.
One interesting plot point could be that Harry discovers a hidden agenda of Voldemort that was unknown to everyone. Maybe there was a part of Voldemort's plan that was so well - hidden that only by having his memories can Harry find out. This could lead to a new race against time to stop something that Voldemort had set in motion long ago.
Harry might become more cynical. Since Voldemort has seen a lot of dark and cruel things, those memories could taint Harry's view of the wizarding world. He could start to question the motives of people around him more, even those he once trusted, like Dumbledore.
Well, in the fanfiction about Voldemort's memories, there could be revelations about his relationships. For example, his connection with his mother, Merope Gaunt. His memories might also show his first encounters with the idea of immortality and how he started to plan his Horcruxes. It can give a deeper understanding of his motives.
One possible plot could be that the students and teachers at Hogwarts watch Harry's memories of facing Voldemort in the graveyard in 'Goblet of Fire'. They might be shocked and sympathetic, and it could lead to a greater understanding of Harry's burden. Another plot could involve Harry's memories of the Dementors affecting him, and as they watch, they figure out ways to help him better combat the Dementors' effects in the future.