Ron would also be important. His loyalty to Harry is unwavering. He might be the one who bravely volunteers to go on the most dangerous part of the rescue mission, perhaps facing off against some of Voldemort's most feared Death Eaters.
One possible plot could be that Harry is captured by Voldemort and his friends have to mount a dangerous rescue mission. They might have to infiltrate Voldemort's stronghold, which could be filled with dark magic defenses.
In such a fanfic, Harry might be tortured for information about the Order of the Phoenix. Voldemort could try to turn Harry to the dark side, using his powerful magic to break Harry's will.
One of the main themes is often the power of friendship. Even when captured, Harry's friends would be fighting for him. Also, the theme of good versus evil is prominent. Harry represents good, and Voldemort is the ultimate evil. The fanfic might show how Harry resists the dark influence of Voldemort. Additionally, themes like hope and perseverance are likely to be there. Harry doesn't give up easily, and that gives hope to the wizarding world that he can still overcome Voldemort, even when in captivity.
One interesting fanfiction could be 'The Dark Captivity'. In it, Harry is held in a magically fortified dungeon by Voldemort. Voldemort's motives for capturing Harry are explored in depth, not just about killing him but also about breaking his spirit. Another could be 'Captive Potter'. Here, Harry endures various mental tortures while being Voldemort's captive, but he manages to secretly communicate with his friends using a very unique and magical way.
Well, if Harry is captured by Voldemort in fanfiction, it could lead to some really dark and intense scenarios. Voldemort might torture Harry to get information about the resistance. Harry, on the other hand, could be secretly planning an escape while pretending to be broken. There could also be a rescue mission by his friends, which would be full of danger and drama.
In some fanfictions, Neville could play a crucial role in rescuing Harry. Neville has grown a lot throughout the series and could surprise everyone with his courage and newfound magical abilities. There could also be some unexpected allies, like a group of centaurs or house - elves who decide to help because they recognize the importance of Harry in the fight against Voldemort. House - elves, for example, are known for their powerful magic that is often underestimated, and they could use it to their advantage to free Harry.
Harry might use his wits and the environment around him while in captivity. For example, if he's held in a place with magical artifacts, he could use them to his advantage. He could break the chains that bind him with a spell - enhanced object and then make his way to Voldemort and defeat him.
In such a fanfiction, Harry might be tortured for information about the Order of the Phoenix. Voldemort could try to turn Harry to the dark side, using threats against his friends.
Another way it could end is with a bittersweet conclusion. Harry may sacrifice something, like a part of his magic or a relationship, in order to stop Voldemort from achieving his ultimate goal. This could be a more complex and thought - provoking ending, showing the cost of victory in the face of such great evil.