It could also change the future of the wizarding world in the fanfic. If Harry and Ginny don't get married, their potential children who were supposed to be powerful wizards in the future might not exist. This could have an impact on the balance of power or the way the wizarding community develops.
For Harry, he may face a lot of criticism from his friends and the wizarding community. They might see him as a heartbreaker or someone who doesn't value his relationships. This could lead to a strain on his friendships, especially with the Weasley family who he is very close to.
One consequence could be that the story takes a different turn. Instead of the typical heroic plot, there might be a more character - centered exploration. Others around him may have to step up and fill the void. For example, his friends might become the heroes instead.
One consequence could be that he loses out on potential rewards or recognition. Maybe he was expected to win, and his refusal disappoints his supporters. Another consequence might be that it changes the dynamics of the story, as other characters may have to step up or the competition may be less interesting without him.
He could be seen as an enemy. SHIELD might not take kindly to someone with Harry's potential abilities refusing to join them, and they could view him as a threat. This could lead to them trying to keep an eye on him or even take action against him if they think he's up to no good.
One possible consequence is that Harry could put himself in danger. Dumbledore is usually very wise, and his advice is often meant to protect Harry. By not listening, Harry may walk into a trap or face a more difficult situation than he expected.
One consequence could be a split in the friendship group. If Harry hates Ginny, Ron, being Ginny's brother, would be in a difficult position. It could lead to a divide between Harry and Ron as well.
Well, in the 'ginny cheats on harry fanfic', a consequence might be that Ginny loses the trust of those around her. Harry might become more guarded in future relationships. Their families would also be affected. For example, the Weasley family might have to deal with the fallout and try to understand why Ginny did such a thing. And Ginny herself could end up feeling very guilty and regretful.
Maybe in the fanfic, Harry has some unresolved personal issues. He could be haunted by his past traumas, like the death of his parents and his battles with Voldemort, which make him feel that he's not in the right mental state to get married.
At first, their relationship might become strained. Harry, being forced into the marriage, could be cold and distant towards Ginny. However, as time passes, they might start to understand each other's situations better. For example, they could share their fears and frustrations about the forced union, which could gradually bring them closer.
One consequence could be a divide in the fan community. Some fans who love fanfiction might feel alienated. They might see this as a lack of acceptance of their creative interpretations.
The relationship might also develop in a more magical way. There could be some sort of magical bond that was created when they were forced to marry. This bond makes them more in tune with each other's emotions. As they learn to understand and control this bond, their relationship blossoms. They start to have feelings for each other that are deeper than just friendship, and eventually, they might truly fall in love.