The abusers might be ostracized by the community. Once Triton finds out and spreads the word, other sea - creatures or characters in the story might shun them. This could lead to them being isolated and having a hard time getting help or resources.
There could be a more official form of justice. Maybe Triton would take the abusers to some sort of underwater council or tribunal. There, they would be judged for their actions. Depending on the laws of the underwater world in this fanfiction, they could be sentenced to hard labor, banishment, or other forms of punishment. And Percy might be given the chance to speak out about his experience during the trial, which would further condemn the abusers.
In the fanfiction world, the abusers may find themselves ostracized by the wizarding community once Viktor reveals what they've done. If Viktor has friends or allies in high places, they could ensure that the abusers are held accountable for their actions. There could also be legal consequences within the wizarding laws if the abuse is of a certain nature. For example, if it involves dark magic or illegal forms of coercion, the abusers could be sent to Azkaban or face other forms of severe punishment.
If the champions decide to take matters into their own hands, they could use magic to teach the abusers a lesson. For example, they could jinx the abusers so that they are unable to harm Harry again. However, if they report to the school, the abusers might face a formal hearing. Depending on the severity of the abuse, they could be banned from certain areas of the school, lose house points, or even be permanently removed from Hogwarts. There could also be social consequences, like being shunned by other students.
Sirius might use magic to punish them. He could hex them or use some other form of magic to make them feel the pain they inflicted on Harry.
Fleur might expose them. If they are students, they could face expulsion from Hogwarts.
The abuser might find themselves ostracized by the whole demigod community. Word would spread about what they did, and no one would want to be associated with them. Also, they could be targeted by other protective figures in Percy's life, not just Poseidon. The gods and goddesses who have some connection to Percy or just have a sense of justice would make sure the abuser pays for their actions. They could be cursed to have a series of misfortunes befall them, like always being in the wrong place at the wrong time and facing various dangerous situations.
They could face expulsion from the wizarding community if the abuse is severe enough. The wizarding world has its own laws and rules, and abusing a young wizard like Harry would be a serious offense.
Percy could become more withdrawn at first. The revelation of his abuse might make him more self - conscious and less trusting.
Triton could be shocked at first. After the initial shock, he might feel a sense of guilt for not having noticed earlier. He could then become very protective of Percy, making sure that Percy is always safe and that no one can harm him again. He might even offer to train Percy so that Percy can defend himself better in the future.
The abuser might face social ostracism. Once Hopper reveals the abuse, the community would likely turn against the abuser. People would stop associating with the abuser, and it could lead to the abuser losing their job or status in the town. Also, there could be legal consequences like having to pay fines or go to jail depending on the severity of the abuse and the laws in place.
There could be a big divide within the village. Some villagers might feel guilty and try to make amends, while others might be defensive. This could lead to internal conflict. The village elders might also have to take steps to reform the village's social structure to prevent such abuse from happening again.