Who could be the antagonists in 'harry becomes cold and strong fanfiction'?

Perhaps the very magic that made Harry a god has a sort of negative side - effect. This could manifest as a shadowy entity within Harry that tries to take over his mind and use his powers for evil. So, in a way, this internal struggle could be the main antagonist in the story.

One potential main antagonist could be a powerful pirate captain who sees Harry as a threat to his control over the seas. Maybe this captain has some dark magic powers as well.

The Ministry of Magic could be a major antagonist. Since necromancy is considered a dark art, they would try to stop Harry at all costs. They might send Aurors after him or try to expel him from Hogwarts.

Some jealous students at Hogwarts could also act as antagonists. They might be envious of Harry's newfound allure and use underhanded tactics to try and make his life difficult.

In addition to Voldemort, there might be dark wizards who are jealous of Harry's new Hanyou powers. They could team up with some of the anti - Harry Hanyous to create a powerful alliance against him. This would force Harry to make some difficult choices about who to trust and how to fight back.

In this fanfiction, it could be that some of the Slytherin students who side with Voldemort become the main antagonists. They might be jealous of Harry's new power and try to expose him or cause trouble for him. For example, they could set traps in the forest hoping to catch Harry when he's in his deer form.

The Death Eaters could still be the main antagonists. Even if Harry is Lord Peverell, they would oppose him as he is still a threat to their dark ideology.

The Ministry of Magic could be a main antagonist. They have a history of being discriminatory towards werewolves. They might see Harry as a threat now that he's a werewolf and try to lock him up or restrict his movements. For example, they could pass new laws specifically targeting him, like making it illegal for him to attend Hogwarts as a werewolf.

Perhaps the traditional enemies of Harry in the wizarding world would also become more hostile. They might be scared of his new powers and try to take him down before he becomes too powerful. And there could be some powerful oni demon lords who want to control Harry and use his unique situation for their own gain.

Some dark wizards or witches who are looking for power might see Harry as a tool or a target. If they think they can harness the power of a hollow - Harry, they would try to capture him. This could lead to many battles and challenges for Harry as he grows up in this strange new form.