Another plot could be that Hermione fakes being a Death Eater. She infiltrates their ranks to gather information for the Order. This would involve a lot of sneaking around, secret meetings, and narrow escapes. It would show her courage and intelligence in a different light compared to the original story.
Often, there are plots where Hermione is a Death Eater as part of a deal to save her friends. Maybe she makes a pact with a powerful Death Eater to spare Harry and Ron in exchange for her loyalty. There are also stories where she becomes a Death Eater due to a family secret or connection that ties her to the dark side. This then leads to a journey of self - discovery as she tries to reconcile her new identity with her old values.
Often, these fanfictions explore the 'what - if' scenarios. If Hermione were a Death Eater, her intelligence would make her a formidable foe. However, the writers also have to be careful not to completely change her core values. Some might show her being forced into the role due to some dark magic or blackmail, which could lead to a story of her redemption later on.
One common plot is that she might be a double agent. Pretending to be a Death Eater to get inside information for the good side. For example, she could be using her intelligence to outwit Voldemort and his followers from within. Another plot could be that she was brainwashed as a child by a hidden Death Eater and only discovers her true identity later. It's a dark and twisted take on her character.
Well, often there's a theme of power struggle. The Death Eater has certain powers and beliefs that might clash with Hermione's. But through their relationship, they might find a balance. Another common theme is the exploration of the grey area between good and evil. Just because the character is a Death Eater doesn't mean he's all bad, and Hermione might start to see that. And of course, there's the theme of trust - can Hermione really trust this Death Eater, and how does that develop over the story?
One common plot twist is that Hermione was actually a double agent all along. She pretends to be a Death Eater spy but is really gathering information for the Order of the Phoenix. This adds an element of mystery and excitement as the other characters in the story are initially unaware of her true motives.
One common theme is redemption. The Death Eater often has to face his past actions and try to atone for them because of his love for Hermione. For example, in some stories, he might start to secretly help the Order of the Phoenix.
One popular fanfiction in this theme might be 'The Darkest Path'. In it, the author creates a tense situation where Hermione is forced to deal with the Death Eaters' schemes in a very immersive way. Another could be 'Forced Alliance' which shows Hermione having to form an uneasy alliance with a Death Eater under duress.
One popular one might be 'Dark Affections'. In it, the complex relationship between the Death Eater and Hermione unfolds in a very intriguing way. It delves deep into the moral and emotional struggles of both characters. The author does a great job of showing how Hermione's intelligence and strong will interact with the Death Eater's dark nature.
Another theme might be the power of knowledge. Hermione is known for her academic prowess. In fanfiction, this knowledge could be the key to either defeating the Death Eater or changing their views. For instance, she might use her knowledge of ancient magic to counter the dark magic of the Death Eater.
Power is a common theme. When Bella is a Death Eater, she often has to deal with the power dynamics within the group. Another theme is the loss of innocence. She has to let go of her previous self - concepts and embrace the dark and often cruel world of the Death Eaters.