Some of the pure - blood wizarding families who have been directly affected by the Death Eaters' actions would likely oppose Hermione. They have lost loved ones and may not be able to forgive. Also, there could be some Ministry of Magic officials who are more focused on punishment rather than rehabilitation and would stand against Hermione's efforts.
In this fanfiction, Hermione could rehabilitate Death Eaters by showing them the error of their ways. She may expose them to the harm they've caused to both the Muggle - born and the wizarding community at large. By making them face the consequences of their actions on a personal level, like the families they've torn apart, she might start to change their views.
Well, in some fanfictions, Hermione might use her superior intellect. She could outwit the Death Eaters by setting up elaborate magical traps. For example, she could use transfiguration magic to create objects that suddenly turn into something dangerous when the Death Eaters approach. Another way could be through her extensive knowledge of potions. She might create a potion that incapacitates or kills them when they come into contact with it.
A fanfiction involving Hermione and Death Eaters could focus on a moral dilemma. For example, if Hermione has the chance to save a Death Eater's life, would she do it? This could explore her character's sense of right and wrong. It could also be about how she endures the psychological torture that the Death Eaters might inflict on her, showing her strength and resilience.
One possible motive could be to use her intelligence against the Order of the Phoenix. Since Hermione is so smart, they might think she can be forced to give up important secrets or strategies.
One great fanfiction with Hermione and multiple Death Eaters could be 'The Dark Encounters'. In this story, Hermione finds herself in a situation where she has to outwit several Death Eaters at once. It shows her intelligence and bravery in the face of danger. Another one might be 'Hermione's Trials Among the Death Eaters' which delves into how she uses her magic skills in a unique way to deal with them.
She could face legal issues in the wizarding world. Killing is not taken lightly, even if it's Death Eaters she's killing. There might be a trial to determine if her actions were justified. If the wizarding authorities are corrupt or influenced by the wrong people, she could even be wrongly convicted.
Some of the more traditional pure - blood families might oppose it. They have strict ideas about family and bloodlines, and Harry and Hermione's situation doesn't fit into their narrow view. For example, the Malfoys might initially be against it, seeing it as a break from the 'normal' wizarding family structure.
Draco Malfoy could be a likely character. He was a Death Eater (or on the verge of becoming one), and his relationship with Hermione has always been complex. There's a lot of potential for a story between them as they have a history of rivalry and yet could potentially find common ground or unexpected feelings for each other.
Obviously, some well - known Death Eaters like Bellatrix Lestrange would be likely main characters. Bellatrix is extremely cruel and power - hungry, so she would be eager to get her hands on Hermione. Lucius Malfoy could also be there. He is always looking for ways to gain more influence in the dark wizarding world, and Hermione might be a means to that end for him.
Another theme is power struggle. Hermione, with her knowledge and magic skills, often has to face the power - hungry Death Eaters. It creates a lot of tension in the stories.