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One consequence could be that Harry becomes withdrawn. He's so used to the abuse that he doesn't trust people easily. He might have nightmares often, reliving the moments of abuse. For instance, if Vernon has hit him before, he could have flashbacks in his sleep.
After saving Harry, Snape may have to deal with a lot of mistrust from some people in Hogwarts who don't understand his motives. However, he might also start to form a closer bond with Harry, which could change the whole dynamic between them. This new relationship could lead to some unexpected alliances and enmities within the wizarding world. And if the Dursleys were to try and retaliate, Snape would have to constantly be on guard to protect Harry from any potential harm they could cause.
The wizarding world would be in shock. The Malfoys are known for their dislike of the Potters, so Draco saving Harry would go against the family's reputation. It could lead to Draco being ostracized by some in the pure - blood community.
They would likely face severe punishment from the wizarding world. The Ministry of Magic would not tolerate such blatant abuse of a wizard, especially one as important as Harry.
He could be doing it out of a sense of justice. Despite his family's views, Draco might see that the way the Dursleys treat Harry is wrong and decides to step in.
His relationships could be affected. Hermione and Ron might have to take on more of a caretaker role, which could change the dynamic of their friendship. Also, he may face discrimination or pity from other students at Hogwarts, which could further isolate him. And in terms of romantic relationships, his self - esteem due to his crippled state might make him less likely to pursue someone like Ginny.
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.
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.
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.
He might become more independent. Without the Dursleys, Harry would have to fend for himself. He could start to discover his true powers faster as he no longer has to hide his magic in the Dursley household. For example, he could practice magic freely and develop his skills more quickly.