Hermione would be one of the main characters. She might be very skeptical at first about Harry's new friendship with Voldemort. She would constantly be on guard and try to figure out Voldemort's true intentions. Another would be Dumbledore. He would likely be watching the situation closely, trying to guide Harry and also be prepared to deal with Voldemort if he reverts to his evil ways.
Ron could also be important. He would be worried about Harry's safety and would probably be the most vocal about his distrust of Voldemort. He might try to convince Harry to break off the friendship. And Snape could also be involved. He has his own complex relationship with Voldemort, and his interactions with Harry would be even more interesting in the context of this fanfiction. He might see this as an opportunity to finally get rid of Voldemort once and for all, or he might be suspicious of Harry's motives as well.
Neville could play a role too. Given his own growth and courage in the original series, he might be one of the few who is willing to give Voldemort a chance, seeing that Harry believes in him. And Bellatrix, as one of Voldemort's most loyal followers, would be very confused and perhaps enraged by Voldemort's new friendship with Harry. Her reactions could lead to a lot of conflict and drama within the fanfiction.
Harry often becomes more conflicted. He has always seen Voldemort as the ultimate evil, but now being mates, he has to re - evaluate his views. He might start to see the humanity in Voldemort, which makes him question his own beliefs and actions in the fight against the Dark Lord. For example, he may hesitate in battles more than before.
The Weasley family in general would be involved. Ginny, for instance, would be heartbroken seeing Harry on Voldemort's side. The family's loyalty to Harry would be put to the test, and they would be among the main characters as they try to either bring Harry back or fight against him if he goes too far with Voldemort.
There are a lot of Harry Potter doujinshi that you can refer to: 1 Harry Potter and Defense Against the Dark Arts: This is a very popular Harry Potter fanfiction about the confrontation between Harry Potter and Voldemort in Defense Against the Dark Arts. 2 Harry Potter and the Goblet of Fire: This is another very popular Harry Potter fanfiction about the adventures of Harry Potter and Voldemort in the Goblet of Fire. 3 Harry Potter and the Prisoner of Azkaban: This is a darker Harry Potter fanfiction book that recounts Harry Potter's experiences in the Prisoner of Azkaban, including his confrontation with Voldemort. 4 Harry Potter and the Order of the Phoenix: This is another very popular Harry Potter fanfiction about Harry Potter's fight against Voldemort in the Order of the Phoenix to protect Hogwarts. 5 Harry Potter and the Half-Blood Prince: This is another heartwarming Harry Potter fanfiction about the reconciliation between Harry Potter and Voldemort in the Half-Blood Prince.
Hermione is often a very popular character. She's known for her intelligence and resourcefulness, and in fanfiction, she might come up with new spells or strategies to help Harry in his fight against Voldemort.
Draco Malfoy is also quite popular. Fanfiction writers might explore his complex relationship with both Harry and Voldemort. He could be in a situation where he has to choose between his loyalty to his family (who has ties to Voldemort) and doing the right thing by helping Harry.
Snape could play a crucial role. Given his past with both Voldemort and his role at Hogwarts, he might be torn between his loyalty to Dumbledore's cause and his complex relationship with Harry. He could be the one who has to make a difficult decision when Harry starts to side with Voldemort. Additionally, Draco Malfoy could be involved. He might see Harry's change as an opportunity to gain more power within Voldemort's ranks, or he could be jealous of Harry's new - found position with the Dark Lord.
Voldemort's daughter herself would be in a very difficult position. She might be shunned by many in the wizarding world just because of who her father is. But some might be curious about her. For example, Luna Lovegood could be one of the first to approach her without judgment, which could start a chain reaction of other characters slowly warming up to her. And the Death Eaters might try to manipulate her into following in her father's footsteps.
In some stories, their friendship could start from a time - travel accident. Harry gets sent back in time and ends up befriending a young Voldemort. He tries to influence Voldemort's path, and they form an unlikely bond. Harry might introduce Voldemort to different values and ideas that were not present in Voldemort's original upbringing, which causes a major shift in the future of the wizarding world.
Obviously, Harry Potter and Voldemort are the main characters. But there could also be other important characters like Hermione and Ron. Hermione might be trying to understand Harry's decision and Ron could be in shock or even feel betrayed at first. Dumbledore, even in spirit form perhaps, could also play a role as he was always a guiding figure for Harry and his presence could still influence Harry's actions in this strange new situation.
Definitely. You can find some on popular fanfiction websites. They usually take the idea of their shared destiny as soul mates and build stories around it. For example, they might create scenarios where Harry and Voldemort have to work together against a greater evil due to their soul - mate bond, which is a really cool twist on the original story.