One interesting plot point could be an alternate take on their relationship during the Horcrux hunt. Maybe in the fanfic, they face a particularly difficult Horcrux that tests their bond in a new way, like a Horcrux that plays on their insecurities about each other.
In many fanfics, their relationship develops through shared hardships during the search for Horcruxes. They rely on each other more and more, which deepens their emotional connection.
One great fanfic could be 'The Life After' which shows Ron and Hermione dealing with the post - war wizarding world. They face challenges like rebuilding Hogwarts and starting their own family in this fic.
Well, perhaps in the fanfiction, Ron and Hermione go on adventures outside of the UK. They could be exploring new magical cultures and using their combined skills. Hermione's vast knowledge and Ron's practical magic skills would make them a great team. They might also be starting a family and facing the difficulties that come with raising magical children in a world that's still recovering from the war.
One interesting plot twist could be Hermione discovering a hidden power within herself related to the Deathly Hallows. Maybe she finds out that she has a special connection to the Elder Wand that no one suspected before.
A lot of fanfictions focus on Ron and Hermione's post - Deathly Hallows life. For example, how they adjust to normal life after all the chaos. They might struggle with things like Ron trying to find a proper job in the wizarding world and Hermione helping him. Their relationship might also face some new challenges, like dealing with family expectations, which makes for an interesting read.
One great fanfiction could be where Ron and Hermione face new challenges in the post - Deathly Hallows world that were not explored in the original. For example, they might have to deal with some dark magic remnants that are affecting the wizarding world's new peace. It could show their relationship growing even stronger as they work together to solve these problems.
Their relationship could become stronger. They've been through so much together during the war, and now they can fully focus on each other. They might start to understand each other's little quirks even better and have more patience with one another.
One popular theme is the adventure they might have had that was not in the original book. For instance, they could go on a quest to find a lost magical artifact that has some connection to the Deathly Hallows. This gives them a chance to show their bravery and intelligence.
Another plot could involve Ron's relationship with his family during the events of the Deathly Hallows in the fanfic. His family has always been important to him, and perhaps in this story, he has to make a difficult choice that could impact his family's safety. He might have to decide between following Harry on a dangerous mission or staying back to protect his family, which could lead to some really emotional and tense moments.
One common theme is family. Since they are likely to start a family after the war, many fanfics explore how they raise their children and pass on their values. For example, teaching their kids about the importance of friendship and courage, just like they learned during their own adventures.