There could be a lot of plot developments. Daphne might form a sort of alliance with Harry's friends to protect him. They could start investigating the roots of the abuse, whether it's something related to the wizarding society's dark secrets or just a personal vendetta against Harry. Also, Daphne may use her knowledge of magic to create some protective spells or wards around Harry. The story could also focus on Harry's recovery process with Daphne's support, showing how he overcomes the trauma of the abuse.
One possibility is that Daphne helps Harry expose the abuser. Another could be that they work together to make sure Harry is in a safer environment.
She might be shocked at first. Daphne could then become very protective of Harry. Maybe she tries to find ways to keep him safe from the source of the abuse.
After the discovery, a possible plot development could be that the champion takes Harry away to a secret location to keep him safe. From there, they might try to heal Harry's emotional wounds. As they do this, they could encounter various obstacles, like the abuser trying to find them or the wizarding authorities not believing their story. The champion might then have to prove Harry's situation, which could involve finding witnesses or evidence. Another development could be that the champion's actions draw the attention of a powerful and mysterious figure in the wizarding world, who either helps or hinders their efforts to protect Harry. This could lead to a whole new set of challenges and adventures in the fanfiction.
One plot development could be Lucius using this information to try and manipulate Harry. He might offer Harry a way out of his abusive situation in exchange for Harry's loyalty or some other form of service. For example, he could ask Harry to spy on Dumbledore for him.
One possible plot development could be that Draco tries to expose the abuser. He might gather evidence secretly and present it to the right authorities at Hogwarts.
One possible plot development could be Nico seeking justice for Percy. He might start to investigate the abuse on his own and gather evidence against the abuser.
Perhaps there could be a plot where Annabeth discovers that the abuse has given Percy some hidden powers or a different perspective on his demigod abilities. So she encourages him to explore and master these new aspects of himself. Or, it could be that the news of Percy's abuse spreads among their friends, and they all come together to form a support system for him, which in turn strengthens their group as a whole.
Harry's life would likely become more stable. He might get proper care and attention, which could improve his academic performance at Hogwarts. Also, he could start to make more friends as he is no longer burdened by the secrecy and pain of the abuse. Dumbledore might arrange for him to have some kind of therapy within the wizarding world to deal with the emotional scars.
Well, Fleur is a complex character. When she finds out about Harry's abuse, she might initially be in disbelief. But once it sinks in, she would feel a deep sense of sympathy. Fleur might use her own experiences to relate to Harry. For example, she has faced prejudice in the wizarding world due to her Veela heritage. She could draw on that strength and determination to help Harry. She may offer him a place to stay away from his abusers, and use her magic to create a safe and comfortable environment for him. Also, she could start training Harry in some defensive magic so that he can protect himself in the future.
There could be a plot development where Remus and Sirius go on a journey to find a new place to start over, away from the abuser. Another development could be that Remus uses his intelligence to outwit the abuser legally. The fanfiction could also show how Remus helps Sirius regain his confidence and self - esteem. As Sirius heals, they might start to explore their relationship in a deeper way, whether it's a stronger friendship or something more romantic. There could also be a sub - plot where other characters get involved in different ways, some trying to help and some causing more trouble.
One possible plot development could be Harry's struggle with his mental health. He might experience symptoms like depression, anxiety, or post - traumatic stress disorder. Another could be his search for justice or revenge against the perpetrator. He may also face challenges in his relationships as he tries to come to terms with what happened.