What are some interesting ideas for 'Harry Potter and Voldemort fanfiction'?

One idea could be a fanfiction where Voldemort has a change of heart due to some ancient magic. Maybe he discovers a spell that shows him the true consequences of his actions and decides to work with Harry to fix the wizarding world instead of destroying it.

One idea could be that Harry, influenced by dark magic, forms an uneasy alliance with Voldemort. They could team up to take over the wizarding world in a different way than Voldemort originally planned, perhaps by ruling jointly. Another plot could involve Harry exploring the darker aspects of his own magic and using some of Voldemort's knowledge to do so, which causes a rift between him and his friends.

One idea could be a fanfiction where Voldemort gets a second chance at life but without his dark magic powers. He has to learn to live as a normal wizard in the wizarding world and Harry Potter has to decide whether to trust him or not.

One idea could be that through the mind link, Harry discovers Voldemort's hidden fears from his past, like his fear of being abandoned as an orphan. This could give Harry an edge in their final battles.

One plot idea could be that the female Voldemort has a change of heart. Maybe she starts to see the error of Voldemort's ways after interacting with Harry Potter. She could start to secretly help Harry and his friends against the Death Eaters, which would create a lot of internal conflict within the Dark side.

One idea could be that Harry, as Voldemort's soulmate, tries to use their connection to redeem Voldemort. He might show Voldemort memories of love and kindness in an attempt to change his dark ways.

In some fanfictions, the soulmate marks might be used to show a hidden connection between them that goes beyond their enmity. It could be a way to explore the concept that they are two sides of the same coin. The marks could also be a source of power for both of them, either by enhancing their existing magic or unlocking new abilities that are only accessible when they are in close proximity to each other.

A plot could involve a magical creature that bonds Harry and Voldemort in an unexpected way. For example, a rare faerie that makes them see each other's memories. Through this, Harry discovers some long - hidden secrets about Voldemort's past that could potentially change the course of their enmity. They then have to decide what to do with this new - found knowledge.

A plot idea might be that the wizarding world initially turns against Harry when they find out he's Voldemort's heir. However, Harry uses this new identity to his advantage by understanding Voldemort's motives better. He could start to study dark magic not to use it for evil, but to find ways to counter it more effectively. For example, he might find a way to use some of the spells Voldemort created to protect the school instead.

One plot idea could be that Harry, as the Master of Death, has the ability to see the true nature of Voldemort's Horcruxes more clearly. He uses this knowledge to track them down in a more efficient way. For example, he can sense the presence of a Horcrux in a place where Voldemort has hidden it well, like an ancient, cursed forest. Another idea is that Harry can communicate with the dead in a more profound way as the Master of Death. He could get advice from the founders of Hogwarts on how to defeat Voldemort once and for all.