Healing. Both Harry and Ginny have likely been through a lot of trauma during the war. So in the fanfiction, their reunion is also a part of their healing process. They support each other and help each other get over the nightmares and fears of the war.
Rebuilding. After the war, not only do they rebuild their relationship, but often in these stories, they are also involved in rebuilding the wizarding world. Like helping to repair Hogwarts or restoring the trust among the wizarding community.
Another great one is 'A New Beginning'. Harry and Ginny reunite in Diagon Alley. They meet by chance while Ginny is shopping for new robes. At first, there is a bit of shyness, but then all the feelings come rushing back. They quickly realize that they don't want to be apart ever again and start making up for lost time.
Some fanfictions might depict them as having a more adventurous post - war life. They could be involved in rebuilding the wizarding world in a more hands - on way. Harry might use his fame and Ginny her popularity among the younger wizards to bring about positive changes. Their relationship would be based on mutual respect and a shared goal of making the wizarding world a better place.
Harry could become an Auror, as he's always been good at fighting dark forces. Ginny, on the other hand, might continue her career in Quidditch. They would support each other's choices. Harry would cheer for Ginny at her matches, and Ginny would be proud of Harry for his work in keeping the wizarding world safe.
One possible story could be that after the war, Harry suffers from paraplegia due to some dark magic he endured during the final battle. Ginny stays by his side, being his strength. She helps him through the difficult process of physical therapy. Their love becomes even deeper as they face this new challenge together.
One scenario could be that Harry is overly protective of Ginny after the war. While it may seem like a good thing, Ginny is a strong - willed witch. If Harry starts treating her like she's fragile and tries to limit her activities, she would get angry. For example, if he doesn't let her participate in certain dangerous but important magical tasks because he's afraid she'll get hurt. Also, if there are rumors or false accusations about Harry in the post - war wizarding world, and he doesn't share them with Ginny right away, she might be mad that he didn't trust her enough to confide in her.
One common theme is rebuilding. After the war, both Harry and Ginny are often involved in rebuilding the wizarding world, whether it's Hogwarts or the whole magical society. Another theme is love and healing. They help each other heal from the traumas of the war through their love. And family is also a theme. Fanfics usually explore how they start their own family and raise their children in a post - war world.
Love is a very common theme. Most of these fanfictions focus on the deep and abiding love between Harry and Ginny. Another theme is adventure. Since they are from the wizarding world, they often go on adventures together, which are exciting to read about.
In these fanfictions, the theme of loss is prevalent. Harry has lost his former self, his full capabilities, and he mourns that. Redemption is also a theme sometimes. He tries to redeem himself in his own eyes, feeling like he's less of a hero because of his disability. And there's the theme of discovery, as he discovers new parts of himself and new relationships that he might not have otherwise.
One common theme is the struggle of Harry to adapt to his new situation. After the war, he already has a lot to deal with, and the added aspect of mpreg brings more challenges.
One possible plot could be Harry and Ginny settling down and starting a family. They might face challenges like dealing with the after - effects of the war on their mental health. Harry could struggle with PTSD from all the battles and Ginny would be there to support him, while also building her own career as a Quidditch player.