Harry might start to receive more protection at Hogwarts. Snape could put in place some measures to keep him safe from further harm. For example, he might assign some students to keep an eye on Harry when he's in vulnerable situations.
Once Kakashi finds out Naruto is abused in the fanfiction, Naruto's life takes a turn for the better. Kakashi would become a more constant presence in his life. Naruto would no longer have to fear the abuse continuing. He'd be given a chance to focus on his growth as a ninja and as a person. Kakashi would introduce him to positive influences in the village, like wise elders or kind - hearted villagers. Naruto's self - image would improve as he realizes he is worthy of protection and care. His living situation might also change, perhaps moving to a more secure and comfortable place. And his dreams of becoming Hokage would seem more achievable as he overcomes the trauma of the abuse with Kakashi's help.
After Snape discovers the abuse, the relationship undergoes a major transformation. Snape begins to protect Harry from not only the Dursleys but also from any potential threats at Hogwarts. Harry, who has been starved for positive adult attention, starts to trust Snape. Snape, in his own brooding and complex way, starts to care for Harry's well - being. He might even start to teach Harry some advanced magic that he wouldn't have taught him before, seeing Harry's need for strength and self - defense in the context of his abusive home life. This new relationship dynamic is a far cry from their initial animosity.
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.
In the fanfic, Snape's reaction could be multi - faceted. He might start by investigating the abuse more deeply. He could use his skills as a Potions master and a former Death Eater to find out who is behind the abuse. And then, he might take steps to ensure Harry's safety. This could involve enlisting the help of other teachers or even trying to get Dumbledore more involved. He may also start to teach Harry some extra skills or give him potions to help him deal with the emotional and physical trauma of the abuse.
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.
In such a fanfic, Snape might initially be shocked. Given his complex relationship with Harry in the original series, he could struggle between his old grudges and his sense of duty. He might take it upon himself to protect Harry secretly at first, perhaps by using his position at Hogwarts to keep an eye on Harry's abusers. For example, if it's the Dursleys abusing Harry, Snape could find ways to make sure they don't go too far without revealing his true intentions.
The relationship becomes more protective. The Weasleys will be more cautious about Harry's well - being.
Snape's reaction could be quite mixed. On one hand, he might be angry at Dumbledore for not doing more if he knew about the abuse. He may also feel a strange sort of empathy towards Harry. After all, Snape himself had a difficult childhood. So, he could start to be a bit more lenient with Harry in his classes and try to subtly offer support.
In the fanfic 'Malfoy's Revelation', Malfoy is paired with Harry for a project. As they spend time together, Malfoy notices some strange behaviors from Harry, like flinching at sudden movements. After some snooping around, he discovers that Harry has been abused. This new knowledge makes Malfoy more empathetic towards Harry and he tries to help him in his own way, which includes standing up for Harry against some of their mutual enemies at Hogwarts.
Fleur might expose them. If they are students, they could face expulsion from Hogwarts.