They could become even closer friends. After going through the war together, they have a deep bond. Maybe they start to rely on each other more than ever, sharing every little detail of their lives.
One possible plot could be that Harry and Hermione travel the wizarding world together, documenting all the post - war changes. They might visit Hogwarts, which is being rebuilt, and help in the restoration process, reminiscing about their old school days as they do so.
Their relationship might start with them being comrades in arms. After the war, they would have more time to really talk and understand each other on a deeper level. This would lead to romantic feelings.
One possible plot could be that after the war, Harry and Hermione realize they have a deep bond that goes beyond friendship. They start to rebuild Hogwarts together and in the process, their feelings grow. They get married in a small ceremony at Hogwarts with their closest friends in attendance.
One great fanfic could be where they travel the wizarding world together to help rebuild the places damaged during the war. They use their combined knowledge and skills to bring back the former glory of Hogwarts, for example. Hermione's intelligence and Harry's leadership make them a formidable team in this post - war setting.
Hermione, on the other hand, could become more confident in her leadership skills. In the post - war fanfic, she may take on more responsibilities in the wizarding community. With Harry by her side, she realizes that she can make a real difference. Her character grows from being the brains behind Harry's operations to a leader in her own right. She also becomes more open - minded about different ways of magic, as she and Harry explore new areas of the wizarding world together.
Harry could develop a more peaceful side to his personality. He's seen enough death and destruction, so he focuses on promoting harmony in the wizarding world. Hermione may change in her approach to magic. Instead of just relying on book knowledge, she starts to experiment more, using her creativity. This change in their personalities can lead to new adventures and a different kind of relationship between them in fanfiction, whether it's a stronger friendship, a romantic relationship, or a partnership in making the wizarding world better.
In some fanfictions, they might become closer friends than ever. After the war, they've shared so much trauma and victory that their bond deepens into a platonic relationship where they support each other through post - war rebuilding and dealing with their respective emotional scars.
Another pairing is Hermione and Draco. This is a more unexpected and often interesting pairing. In some fanfictions, they put aside their differences from the war and start to see each other in a new light, and they might work together on some post - war projects for the betterment of the wizarding world.