Lucius could start by getting closer to Hermione through shared interests in magic, like ancient spells or dark arts knowledge. He may manipulate situations so that Hermione starts to question her relationship with Draco. He might also play on her insecurities or ambitions, making her believe that he can offer her more than Draco ever could.
Well, in some fanfictions, Lucius might use his charm and power. He could be depicted as very persuasive and use his status in the wizarding world to make Hermione see him in a different light. Maybe he offers her opportunities for knowledge or power that she doesn't get with Draco.
She could face isolation within the Hogwarts community. The students might gossip about her newfound relationship with Lucius. Hermione may also become more involved in the darker aspects of the wizarding world if Lucius leads her that way. Her academic focus could shift as she gets caught up in the drama of this new relationship. Moreover, she may end up regretting leaving Draco if she later realizes that Lucius was just using her, and this could lead to a lot of emotional turmoil for her.
Well, perhaps he uses his influence in the wizarding world. Maybe he has some connections or knowledge that allows him to intervene and get Hermione out of the abusive situation. For example, he could use his status among the pure - blood families to put pressure on the abusers.
In many such fanfictions, Sirius might use his magic skills. He could be quicker and more powerful than Lucius in a duel. Maybe he uses a powerful spell to stun Lucius and then whisks Draco away to safety.
Well, it could be that Lucius uses his powerful influence in the wizarding world. Maybe he intimidates Ron with threats related to his family's status or he uses some dark magic to create a distraction and whisk Hermione away.
Well, it changes Draco in many ways. Firstly, he realizes that there are things more important than loyalty to his family's dark cause. Saving Hermione makes him see the goodness in people like her. It could also make him more determined to change the reputation of his family. He may start to work secretly against the Death Eaters, using his knowledge of their plans from being part of the Malfoy family. His relationship with Hermione could also be a catalyst for his character growth, as she challenges him intellectually and morally, pushing him to become a better person.
Hermione could also use her magic skills to her advantage. She is a powerful witch, and in the Malfoy household, she may use her magic to create a space for herself where she can be true to herself. She might also use magic to subtly influence Lucius and make him more accepting of her and her beliefs.
In such fanfictions, Lucius might show his protection by shielding Draco from the Dark Lord's direct orders. For example, he could try to find ways to delay or modify tasks assigned to Draco that are too dangerous. He may also use his influence within the Death Eater ranks to keep Draco out of harm's way.
Lucius has a sense of entitlement that comes from his pure - blood upbringing and family wealth. Hermione, being a Muggle - born (in the original story), has had to fight for her place in the wizarding world. So in fanfiction as siblings, Lucius might initially look down on Hermione's more inclusive views, while Hermione would be appalled by Lucius's prejudice. However, as the story progresses, they could learn from each other. Lucius could become more open - minded and Hermione could understand the pressures of a pure - blood family.
Well, originally Lucius is all about power and loyalty to Voldemort. However, in the fanfiction, he might be more focused on Harry. His motives change from just serving the Dark Lord to having personal interests in Harry. He may use his intelligence and charm in a different way than in the books, not for evil deeds related to Voldemort but to get closer to Harry.
Harry Potter can be an interesting character to pair with them. It creates a lot of conflict and potential for character development. Given their opposing stances in the original story, it can lead to some really intense and thought - provoking scenarios in fanfiction.