Who could be the main antagonists in 'harry is in a gang 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.

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.

Voldemort or his followers could still be antagonists. They might not like the idea of Harry being under Euryale's protection as it could make him more powerful. Another possibility could be some creatures from Euryale's world who are against her taking in an outsider like Harry.

It could be some jealous rivals of Arcuid. They might see Harry as an outsider and a threat, especially if they think Arcuid is giving Harry special treatment or powers. Maybe there are those who want to use Harry against Arcuid for their own gain.

The Ministry of Magic could be antagonists. If they start to oppress those with different views, including Harry, it could drive him towards darkness. Their corrupt and unjust actions might make Harry think that the only way to fight back is by using dark magic.

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.

Another possible antagonist could be some dark wizards who are trying to use Harry's new identity for their own evil purposes. They might try to manipulate him or use his connection to the Blacks to gain access to powerful magic or influence within the wizarding world.

Perhaps there could be some overseers or enforcers who are especially brutal towards the slaves. They might take pleasure in punishing the slaves and would be a major obstacle for Harry. These characters could be loyal to the slave - owning system and do everything to maintain it, seeing any sign of resistance from Harry as a threat.

There could be a new group of dark wizards or witches who are aware of Harry's status as a male carrier. They might see him as a threat to their plans for domination in the wizarding world and thus try to stop him or take whatever he is carrying for themselves. This new group could have different motives and powers compared to Voldemort's Death Eaters.

The Joker could be a main antagonist. He would be fascinated by Harry's magic and would try to use it for his own evil purposes or just to cause chaos. He might try to drive a wedge between Harry and Batman by using mind games.