Neville could be a supporting character. He might be there to offer his unique perspective on things. Since he has his own growth arc in the original series, in the fanfiction, he could be a source of strength and advice for Harry and Hermione. Luna Lovegood is another possible supporting character. Her dreamy and wise nature could provide some interesting insights and help to Harry and Hermione as they navigate their new relationship and the challenges that come with it.
Hermione and Harry are the central figures. However, other characters like Ron also get affected. Ron's relationship with Hermione and Harry is put to the test because of this law. He might feel jealous or left behind. Also, characters like Dumbledore or Snape (if the fanfic includes them in this context) could play roles in either supporting or opposing the law which in turn affects Hermione and Harry.
Their relationship would likely become more complex. They would have to consider each other in new ways. For instance, they'd have to make joint decisions about their living arrangements, finances in the wizarding world (like property in Diagon Alley or Hogwarts' resources they might inherit). Also, they'd need to be more emotionally open with each other. Before, they were just friends, but now they have a legal bond. There might be some awkwardness at first, but as time goes on, they could develop a deeper, more romantic connection.
One possible fanfiction could be that the wizarding world enacts a new marriage law which somehow forces Harry and Hermione to consider marriage. They might initially be resistant as they've always seen each other as friends. But as they start to go through the motions of fulfilling the law's requirements, they discover new aspects of their relationship. They realize that they share a deeper bond than they thought, filled with mutual respect and understanding.
One common theme is the clash of cultures. Hermione is from a more Muggle - friendly background and Blaise from a pure - blood family. Their different views on marriage law often reflect this divide.
The theme of redemption also often appears. Snape has a complex past, and in these fanfictions, his relationship with Hermione can sometimes be a path towards redemption for him. Hermione, with her kind heart and intelligence, might help him come to terms with his past actions and find a new way forward in his life.
A third theme is the exploration of the wizarding world's social structure. The marriage law in these fanfictions often reflects on how the wizarding society functions, how it enforces certain rules on its members, and how Hermione and Fred's relationship challenges or conforms to these social norms.
One common plot is Hermione trying to outwit Voldemort. Since she's so clever, she might use the marriage situation to her advantage to gain information about his plans and weaknesses. Another plot could be the reactions of other characters like Harry and Ron. They would likely be horrified and try to rescue Hermione from this awful situation.
One common theme is the clash of different generations. Sirius is from an older generation compared to Hermione, so there are often differences in values and beliefs that create interesting conflicts.
A major theme is the adjustment to a new life together. In these fanfictions, they usually have to deal with new living arrangements, family expectations, and social pressures due to the marriage law. For example, they might have to face the reactions of their friends and family. Also, self - discovery is a theme. Through the challenges of the marriage law, they learn more about themselves and what they truly want in a relationship. This often leads to a stronger bond between them.
There could also be secondary characters like their friends. For instance, Harry and Ron might be involved. Harry could offer his support and advice to Hermione, while Ron might be a bit more skeptical about the whole Hermione - Oliver relationship. Their reactions and interactions can add depth to the story. Also, Oliver's Quidditch teammates could play a role, perhaps causing some tension between Hermione and Oliver when it comes to his time on the team.