After the split, Harry might find that his life is more chaotic without Hermione's rational thinking. He could start making bad decisions. Hermione, in her solitude, might meet new people who introduce her to different ways of thinking. As the story progresses, there could be a big event, like a dark wizard threat, that makes Harry and Hermione realize they need each other's help again, and they have to work through their differences to face the common enemy.
Perhaps Hermione, feeling hurt, throws herself more into her studies and magical research. She could discover something really important that she initially wants to keep from Harry out of spite. But as time passes, she realizes that the knowledge she has could help Harry in some way. Harry, on the other hand, gets into some trouble with his new friends that makes him question if he made the right choice in leaving Hermione.
The story could develop with Hermione trying to figure out what went wrong. She might start investigating, talking to other friends they have in common to see if they know anything. Meanwhile, Harry could start making new friends who are more in line with his new mindset. But he might start to realize that he misses Hermione's unique qualities.
Often, there's a period of sadness and confusion for both of them. Hermione might try to figure out what she did wrong and reach out to Harry. Meanwhile, Harry might start to realize that he misses her friendship. Then, there could be a reconciliation scene where they finally talk things out and their friendship is restored, stronger than before.
One reason could be a misunderstanding. Maybe Hermione does something that Harry misinterprets, like getting too involved with her studies and seeming to neglect their friendship. Another could be outside influence. For example, if there are other characters who spread false rumors about Hermione to Harry, it might drive a wedge between them. Or perhaps Harry starts to develop different values and beliefs that clash with Hermione's, leading to a breakdown in their friendship.
The story could focus on Ash exploring other aspects of the Pokémon world, like Pokémon research or Pokémon care. He might use his experience as a trainer to help those in need in different ways.
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.
It could also develop in a way that Hermione realizes she made a mistake after Harry leaves. She then sets out on a journey to find him, and along the way, she discovers more about herself and her feelings for Harry. Meanwhile, Harry is going through his own trials and tribulations, and when they finally meet again, they have both changed so much that they need to re - evaluate their relationship from a whole new perspective.
Well, their friendship could start with a common goal. Maybe they find out about a hidden danger in Hogwarts that the teachers are unaware of. Harry's bravery, Hermione's intelligence and Draco's knowledge of the Slytherin side of things could combine to solve the mystery. They might initially be reluctant to work together, but as they face challenges, they start to respect each other more and form a real friendship.
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.
Harry might get really angry at Hermione. This could lead to a rift in their friendship, causing them to avoid each other for a while. Their other friends like Ron would then be caught in the middle, trying to mend the relationship.
Another way it could develop is that it could create a rift among their friends. Some friends might support their relationship, while others, like those who have always shipped different pairings, could be against it. This could lead to some interesting plot twists and drama within the fanfiction story.
For Harry, this would be another chance to prove his heroism and loyalty. He would become more confident in his leadership abilities as he takes charge of the rescue mission. Hermione would grow in her ability to trust her instincts more. Usually so reliant on books and knowledge, she would learn to rely on her gut feelings when it comes to saving Luna. Luna, on the other hand, would become more aware of her own value. After being saved by her friends, she would realize how important she is to them and become more assertive in her own abilities.