Some fanfictions might depict that the wizarding community might see her as a hero. However, others could show that she faces backlash from some conservative wizards who think she overstepped her bounds. They might try to isolate her at Hogwarts or spread rumors about her. But her friends like Harry, Ron and Hermione would surely support her through it all.
One scenario could be that Bill uses his charm to charm the Dursleys into letting Harry go. He might be really smooth - talking and make them believe that it's in their best interest to send Harry away with him. Maybe he offers them some sort of compensation in the wizarding world, like a magical object that will keep their house clean forever.
She might face some magical backlash. Saving someone from the veil could be against the natural laws of magic in the fanfiction world, so she could experience some physical or mental exhaustion as a result.
One consequence could be that Bellatrix becomes enraged and sets out to hunt Fred down. This would put Fred in constant danger as Bellatrix is a very powerful and vengeful witch.
Well, if we consider this in the context of fanfiction, it might be a very extreme exploration of the 'dark!Harry' trope. However, it goes against everything Harry represents in the original series. Firstly, the Dursleys, despite their mistreatment of Harry, are Muggles and killing and eating them is an inhumane act. This would cause a huge uproar in both the Muggle and wizarding worlds. Harry would be seen as a monster.
She might lose Harry's trust completely. Once trust is broken, it's very hard to regain, especially in a relationship as deep as theirs. Harry could become distant and cold towards her.
One possible consequence could be that she spends a lot of time reading fanfiction instead of doing other things, like focusing on her own real - life relationships or hobbies. For example, she might miss out on spending time with her friends or family because she's so engrossed in the fictional stories about Harry.
There are many ways it could be written in fanfiction. Ginny might use her knowledge of the wizarding world and Hogwarts' secrets. She could use a special spell that she learned from an old book in the Hogwarts library. This spell could create a portal right inside the Dursleys' living room that only Harry can see. Ginny could then communicate with Harry through a magical device, tell him about the portal, and he can use it to escape from the Dursleys. Ginny would have to be very careful and plan everything precisely to avoid detection by the Ministry of Magic, as using magic around Muggles without permission is strictly prohibited.
One consequence could be that Artemis becomes indebted to Percy. This might lead to her providing him with special favors or assistance in his future adventures. For example, she could offer her hunters to help Percy in a battle.
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.