Well, McGonagall is a very caring and strict character. When she discovers Harry is being abused in fanfiction, she would first ensure Harry's safety. She might offer him a safe haven at Hogwarts all year round if possible. Then, she would start an investigation into the abuse. She'd use her influence and connections in the wizarding world to get to the bottom of it and make sure justice was served for Harry.
Once McGonagall discovers the abuse, the story could take many turns. Harry could be given special training or mentorship by McGonagall to build his self - esteem. The wizarding world might also change some of its policies regarding the protection of children in response to Harry's case. Meanwhile, the relationship between Harry and McGonagall would grow stronger as she becomes a sort of surrogate family for him, and he would rely on her for guidance and support in his journey of recovery from abuse.
One great fanfiction in this genre is 'A New Beginning' where McGonagall steps in to rescue Harry from his abusive relatives. It beautifully shows how she nurtures him and helps him grow in confidence.
They might face magical punishment. For example, they could have their magic restricted or be sent to Azkaban if it's a really bad case. McGonagall would not tolerate such behavior and would push for the strictest punishment.
She might be horrified and immediately take steps to protect Sirius. For example, she could confront the abuser or report it to the proper authorities within the wizarding world.
Perhaps Hermione is facing some sort of interpersonal issue. She could have had an argument with her friends, like Ron and Harry. In the wizarding world, friendships are crucial. If there's a rift in their relationship, it would deeply affect Hermione. McGonagall, being a perceptive teacher, might then try to mediate and give Hermione advice on how to handle the situation.
Their friendship would become deeper. Ron would be more protective and more attuned to Harry's emotions. There would be a new level of trust as Harry has shared such a difficult and personal experience with Ron.
The other students could have a range of reactions. Some might be sympathetic and try to befriend Harry more. Others might be afraid, especially if the abuser is still around. But overall, it would create a stir in the wizarding community, and there would be a general outpouring of concern for Harry's well - being.
The abuser might face the wrath of the DA. They could be ostracized within the wizarding community. The DA members could use their influence to make sure the abuser is held accountable for their actions.
Well, first of all, the students would probably be shocked. His friends, like Ron and Hermione, would be extremely angry at the Dursleys. They might try to comfort Harry more often. And the school itself could start providing special resources for Harry, such as counseling or extra protection spells. Also, there could be a big change in the way the wizarding community views Harry. Instead of just seeing him as the 'Boy Who Lived', they would see him as a victim who needs support.
Well, if we consider the 'umbridge finds out harry was abused fanfiction', it really depends on the writer's take. One possibility is that Umbridge, being the power - hungry character she is, might try to cover it up to maintain the status quo at Hogwarts. On the other hand, she could also see it as a way to discredit Dumbledore, thinking he failed to protect Harry. There's also a chance that the discovery could lead to a change in Umbridge's relationship with Harry, from being a tormentor to an unexpected ally, though this would be a huge shift in her personality.