Their parents could be main characters. Blaise's mother, who might be a proud Slytherin - influenced witch, and Hermione's parents, who are Muggles but have a unique connection to the wizarding world through Hermione. Their interactions could add a lot of depth to the story.
Maybe their siblings, if they have any. For Blaise, a younger or older brother or sister who has their own views on the family reunion and Hermione's presence. And for Hermione, perhaps an imaginary sibling in a fanfiction world, who could bring out different aspects of Hermione's personality as she tries to introduce her wizarding world to them during the reunion.
Well, it might involve a big family gathering where Blaise and Hermione's families meet for some special occasion. There could be some unexpected alliances formed. Their families might discover that they have more in common than they thought, like a shared interest in a particular branch of magic. And Blaise and Hermione might find themselves slowly warming up to each other in this family - centered environment.
One of the main characters could be Hermione's old best friend from primary school. Maybe they used to share secrets and now this friend is curious about Hermione's new life. Another could be a former teacher who remembers Hermione as a brilliant student and is excited to see how far she's come. There could also be a bully from her primary school days who has now changed and is trying to make amends.
Obviously, Blaise and Hermione themselves are often the most liked. Their unique relationship as twins in this alternate universe draws readers in. Also, if there are any original characters created to support their story, like a wise old wizard who mentors them, can also be quite popular.
At first, Hermione would be shocked. But then, she would quickly compose herself. She could play along with Draco and Blaise for a while, pretending to be compliant while she actually gathers information about their motives and the place where they are holding her. She might also try to turn them against each other by highlighting their differences in goals or personalities. Given her intelligence, she would surely come up with a clever plan to get out of the situation.
One possible fanfiction could involve Hermione and Blaise coming from different backgrounds in the wizarding world. Their relationship might start as an unexpected encounter. Maybe they are paired together for a special project at Hogwarts. As the story progresses, Hermione discovers she's pregnant. This could lead to a lot of drama as they face the reactions of their friends and families, who might be against their union due to the house rivalries. For example, Hermione's Gryffindor friends could initially be skeptical of her relationship with Slytherin Blaise.
In this fanfiction, the pregnancy could be a result of a magical accident. Hermione and Blaise are working on a powerful spell, and something goes wrong. Now they have to deal with the consequences. Hermione might be scared but also determined to face it. Blaise would need to step up and support her. They might have to go on a journey to find a way to reverse the spell if they don't want the pregnancy, or they could accept it and start building a family. Along the way, they would face many obstacles, like other wizards who might want to use the situation for their own gain.
They're popular because it's an interesting and unexpected pairing. Fans like to explore new relationships that deviate from the original canon. Hermione and Blaise come from different backgrounds in the HP world, so seeing them as twins creates a whole new dynamic to play with.
There are some out there. However, the quality can vary greatly. Some might focus on a romantic obsession where Blaise is constantly pining for Hermione, while others could take a more platonic but still intense interest approach. It really depends on what you're into in terms of story themes and writing styles.
Another theme is the exploration of the wizarding world from their combined perspectives. Fanfictions often use their relationship as a means to show different aspects of magic, Hogwarts, or the wizarding society that might not be as easily explored through other characters. For example, they might go on adventures in less - known parts of the wizarding world.
One possible fanfiction could be about Blaise, Hermione and Draco all studying in the library. Maybe they start off as rivals, but as they spend more time in the library together, they begin to understand each other better. For example, Hermione might be helping Blaise with a difficult spell, and Draco overhears and joins in with some of his own knowledge. This could lead to an unlikely friendship between the three of them.