In fanfiction where Harry Potter duels Voldemort, how can Harry's friends contribute to his victory?

Their relationship could change if Harry realizes during the duel that Snape has been protecting him all along. This newfound knowledge could turn Harry's hatred or suspicion into respect.

If Voldemort loses his memory, Harry might initially be extremely suspicious. But as he sees Voldemort's new, innocent state, he could start to feel a bit of pity. He might still be on guard, but not as hostile as before.

One common theme is redemption. It often involves Voldemort getting a chance to redeem himself through his friendship with Harry. Another theme could be the exploration of power. How would their combined powers be used? Also, the theme of forgiveness might be present as Harry has to forgive Voldemort's past actions for the friendship to work.

Well, usually in such fanfictions, Harry might face a lot of emotional turmoil and have to find his way alone to overcome the betrayal and the challenges that come with it.

He survives through his strong willpower. Harry has always been a determined character, and that could help him endure the torture.

Harry could become more powerful in a way that scares his friends. Voldemort's training might focus on the Dark Arts, which are powerful but dangerous. This could change Harry's magic style. He may become more solitary as his new skills and knowledge set him apart from his Hogwarts friends who follow a more traditional path of magic.

Well, it might make him more cynical at first. After all, he has just absorbed the essence of the most evil wizard. But then he could use this newfound darkness within him to better understand the bad in the wizarding world and fight it more effectively.

In this fanfiction, it could be that Voldemort has a premonition. He sees that if Harry Potter dies, it will lead to a series of disasters that will also destroy his own plans. So, in order to preserve the balance or to keep his long - term goals intact, he saves Harry. For example, if Harry's death causes an uncontrollable chaos in the wizarding world, Voldemort's rule over the dark forces might be disrupted. So he steps in to save Harry.

He might be very sad at first. Harry has always valued his friends, so being forgotten by them would be a huge blow.

Yes, the world of fanfiction is vast and full of strange and wonderful ideas. There might be some fanfiction out there where Harry Potter is Voldemort's grandson. Fanfiction writers often like to play with the established relationships in the original work and come up with really unique concepts. They might rewrite the story from this new perspective, changing many of the events and character interactions in the process. But to actually find such a fanfiction, one would probably need to search through various fanfiction websites.