Ron Weasley often makes an appearance. He might be suspicious of Draco's intentions towards Hermione and try to protect her. His loyalty to Hermione and his hot - tempered nature can add a lot of drama to the story.
One possible plotline could be that Draco, in his 'evil' guise, is initially set on causing trouble for Hermione at Hogwarts. But as the story progresses, he might start to have complex feelings for her, leading to an internal struggle between his dark intentions and new - found emotions.
One popular theme could be the idea of redemption for Draco. In many fanfictions, he is shown to overcome his family's dark past and prejudice. Another theme might be the power of friendship or love that develops between Hermione and Draco, despite their initial differences. It could also explore how they navigate the complex wizarding world together, facing challenges from their respective houses and the general wizarding society.
In a fanfiction with this theme, it could be set post - war. Draco and Hermione find themselves in a situation where they are on the run from some dark wizards who are after them for different reasons. During their escape, Hermione gets wet and cold. Draco, having a change of heart after the war, gives her his warm cloak. This act of kindness begins to break down the barriers between them, and they start to have deeper conversations, realizing they have more in common than they thought.
Perhaps there's a fanfiction where a powerful and dark wizard from outside the school is targeting Muggle - borns. Hermione, being a Muggle - born, is understandably afraid. Draco, who has always had a complex relationship with Hermione, is conflicted. He doesn't want to see her hurt because, deep down, he has feelings for her. He ends up using his Slytherin cunning to outwit the dark wizard and keep Hermione safe.
In a different fanfiction, Hermione could be afraid of a prophecy that involves her and Draco. The prophecy seems to foretell doom and destruction. She's terrified of what might come to pass. Draco, who also hears about the prophecy, tries to comfort her. He tells her that prophecies can be misinterpreted and that they can change their fate together. He starts to work with Hermione to figure out a way to avoid the bad outcomes predicted by the prophecy.
A third good fanfic is 'Manacled'. This one is quite dark and intense. It shows a different side of both characters as they are in a difficult situation. The story is very engaging and the relationship that forms between Draco and Hermione is complex and multi - layered.
Yes, it might seem a bit strange considering their relationship in the original 'Harry Potter' series. They were from rival houses and often at odds with each other.
One great fanfiction about Hermione and Draco in an apartment is 'The Unexpected Roommates'. In this story, they are forced to share an apartment due to some magical mishap. It's really interesting to see how their initial hatred slowly turns into understanding and then something more. The author does a great job of portraying their characters realistically within this new living situation.
Some fanfictions might use the snake necklace as a sign of danger or a connection to the Dark Arts. Draco could be in possession of it, and Hermione, being the brave and intelligent witch she is, tries to understand its power in order to protect Hogwarts or even Draco himself from the possible negative influences associated with the necklace.