One common theme is the exploration of a forbidden love. Since in the original series they were more like friends, fanfictions often make their relationship something that has to be kept secret or is frowned upon by others at Hogwarts. Another theme is the idea of self - discovery. As they navigate this new relationship, they learn more about themselves.
Common themes include rewriting the love triangle. Instead of Ron - Hermione - Harry, it becomes Harry - Hermione. There are also themes of self - discovery for both Harry and Hermione. As Harry realizes his love for Hermione, he might also discover new things about himself. And often, there's a theme of overcoming obstacles, like the disapproval of their friends or the chaos of the wizarding world.
One common theme is the struggle with acceptance. Since it's an unconventional relationship in the context of the Harry Potter world, the characters often have to deal with how others will view them. Another theme is the exploration of love beyond traditional boundaries, as Draco's feelings cross the lines of the typical rivalries and friendships in the series.
A frequent theme is the exploration of their individual traumas and how they support each other through it. Tonks' insecurities about her appearance and Harry's PTSD from his many battles could be explored. Another theme could be the power dynamics, as Harry is seen as a very powerful wizard and Tonks is also a capable Auror. How they navigate this in their relationship can be an interesting theme in such fanfictions.
One common theme is the 'what - if' scenario. Like what if Harry had realized his feelings for Hermione earlier in the series. Another theme is dealing with the challenges of their friendship turning into a romantic relationship while still being part of the wizarding world's battles.
Adventure is also a big theme. They go on all sorts of adventures in the wizarding world, and fanfiction writers like to continue that. Maybe they go on a new quest to find a lost magical artifact or solve a mystery that was left unsolved in the original books. It gives the characters a chance to show their skills and grow even more.
One common theme is redemption. Mundungus is often depicted as a rather unlikable character in the original series, so in fanfiction, he's often on a path to redeem himself, with Hermione sometimes being the catalyst for that change.
Another theme is the subversion of expectations. Since Hermione is typically seen as a strong and independent character in the original series, seeing her in a submissive role in fanfiction challenges the reader's preconceived notions. It makes them think about the character in a different way and can open up new interpretations of her personality and potential relationships within the Harry Potter universe.
Another common theme is empowerment. Hermione is known for her intelligence and Ginny for her courage. Fanfictions usually show them using these qualities to overcome challenges. Like in some stories, they fight against dark magic or unfair school rules. They don't just rely on the boys but take matters into their own hands and prove that they are strong witches in their own right. This can be really inspiring for readers.
One common theme is friendship. It often explores how Harry, Hermione and Malfoy can form some sort of friendship despite their differences. For example, they might start to understand each other's motives better.
Often, there's the theme of betrayal. Since Harry and Hermione have a strong friendship in the original series, this act of 'cheating' would shatter that trust. Also, some fanfictions might explore themes of redemption for Harry if he realizes his mistake. There could also be themes related to the love triangle getting even more complicated and how it impacts the wizarding world around them.