One common theme is redemption. Lucius is often portrayed as a character in need of redemption, and Hermione is the one who can help him see the error of his ways. This can involve him gradually changing his views on Muggle - borns and the Dark Arts.
One common theme is redemption. Since Lucius has been a Death Eater, many fanfics explore his journey towards redemption with Hermione often being a catalyst for this change. For example, her values and her belief in second chances can inspire Lucius to turn his life around.
In this type of fanfiction, it could start with Hermione being an orphan for some reason. Lucius, seeing her magical abilities and intelligence, decides to take her in. At first, Hermione would be very much out of place in the Malfoy Manor. However, as time passes, she might start to change the Malfoy family's views little by little. Lucius would have to deal with the reactions of other pure - blood families, and Hermione would face challenges from both the Malfoy family's expectations and the outside world's perception of her being in the Malfoy household.
One idea could be that they are forced to work together on a magical research project. Hermione's vast knowledge and Lucius's experience in the wizarding world create an interesting dynamic. They start off hating each other but gradually come to respect one another's abilities.
Hermione's character would likely experience a great deal of conflict. On one hand, she has her own strong values and beliefs which are in direct opposition to the Malfoy family's pure - blood ideology. But on the other hand, she might be forced to adapt to her new living situation. She could become more guarded and learn to play the political games within the wizarding society as she tries to survive in the Malfoy household.
In some fanfictions, they start as enemies. Lucius, being a Death Eater, initially sees Hermione as a Mudblood and treats her with disdain. But as the story progresses, they might be forced to work together due to some magical plot twists. For example, they could be on a quest to retrieve a powerful magical artifact that requires both their skills and knowledge.
By the end of the quest, their relationship could be completely transformed. They might see each other in a new light. Hermione could see that Lucius has more depth than she initially thought, and Lucius could come to respect Hermione's intelligence and tenacity. This could lead to a new understanding between them, and perhaps even a friendship or a more complex relationship that defies the expectations of the wizarding world.
One popular fanfic could be 'The Unlikely Alliance'. In this fic, Lucius Malfoy and Hermione Granger are forced to work together due to some unforeseen circumstances in the wizarding world. Their initial animosity slowly turns into a grudging respect as they realize they have more in common in their fight against a new dark force than they thought.
In fanfiction, it might be due to a redemption arc for Lucius. He realizes the error of his ways in the wizarding war and starts to view Hermione, a muggle - born with great talent, as someone worthy of protection. He could also be protecting her from other dark wizards who might want to harm her because of her intelligence and influence among the light - sided wizards. This protection could also be a form of self - atonement for his past misdeeds against the muggle - borns.
One possible reason could be the contrast between them. Lucius is from an old, pure - blood wizarding family with dark tendencies, while Hermione is a Muggle - born with strong moral values. This contrast creates an interesting dynamic that fanfiction writers like to explore.