In this kind of fanfiction, the main antagonists could be a combination of the traditional Harry Potter villains and some new ones. The Death Eaters are an obvious choice as they are the main threat in the original series. However, since Harry is being raised by Revy, there might be some underground criminal organizations in the wizarding world that see him as a threat. These organizations might deal in dark magic items or illegal magical activities and don't want Harry interfering with their business. Also, there could be some wizards who are jealous of Harry's unique upbringing and the power he might gain from it, and they could turn into antagonists.
The main antagonists in a 'Harry Potter raised by Revy' fanfiction might be quite diverse. Firstly, the Death Eaters would remain a major threat. But given Harry's new upbringing, other groups could emerge. There could be a group of pure - blood supremacists who are not only against Muggle - borns but also against Harry for his unorthodox upbringing. They might see him as a corrupting influence on the wizarding world. Additionally, there could be some dark wizards who are in league with Voldemort but have their own agendas. They might target Harry not just because of Voldemort's orders but also because they fear the new skills and ideas Harry might bring to the fight against the dark side, having been raised by Revy.
It could be the Death Eaters still. But with Harry being raised by Revy, they might face a much more formidable opponent. Harry would have a different set of skills and a more aggressive approach, so the Death Eaters would have to adapt. Another possibility could be some of the more corrupt wizards in the Ministry of Magic who don't like this new, unpredictable Harry.
The main antagonists could still be Voldemort and his Death Eaters. Just because Harry is being raised by Moriarty doesn't mean Voldemort's threat disappears. In fact, Moriarty might see Voldemort as either a rival or a potential ally, which would add another layer of complexity to the story.
Well, it could be a very interesting mix. Revy is a tough and wild character. If she raised Harry Potter, he might grow up to be more street - smart and less naive. He could learn combat skills earlier and be more fearless in the face of danger. Also, Revy's no - nonsense attitude might make Harry a more decisive person.
In this fanfiction, the Death Eaters would remain as antagonists on the wizarding side. They follow Voldemort's ideology and would oppose Harry no matter who raised him. But also, there could be elements from Jean Grey's world that turn against Harry. For example, if there are mutants who fear that Harry's magic could disrupt the balance between mutants and humans, they might become antagonists. It would add a whole new layer of conflict to the story.
In this kind of fanfiction, the main antagonists could be a combination of the traditional Harry Potter villains like the Death Eaters and new threats from the Marvel side. For instance, Dormammu could somehow sense Harry's potential and try to either possess him or destroy him to prevent him from becoming a powerful force against him. And of course, there would always be some wizards in the Harry Potter world who are against any kind of change or outside influence, and they could also oppose Harry.
Voldemort would still be a major antagonist. But there could also be new threats emerging from the clash of the wizarding world and Zabuza's world. Maybe some dark wizards who are envious of Harry's unique upbringing and new skills would try to take him down.
It could be the same Voldemort as in the original series. But his approach to Harry might be different. Since Harry is being raised by Raven, he might be more difficult to target as he has different knowledge and skills. So Voldemort might have to come up with new and more devious plans to get to Harry.
Sauron could be a major antagonist. His power and desire for domination would put him in direct conflict with Harry. Voldemort - like elements might be incorporated into Sauron's character in this fanfiction.
Voldemort would still be a major antagonist. His goal of ruling the wizarding world and eliminating Harry Potter would remain. However, there could be new antagonists added due to Hawkgirl's presence. For example, some Thanagarian villains might follow Hawkgirl to the wizarding world and see the chaos Voldemort is causing as an opportunity to gain power for themselves. They could try to form an alliance with Voldemort or simply try to take over the wizarding world on their own.
It could be the Saiyans. In the Dragon Ball universe where Frieza exists, the Saiyans are often his enemies. Even if Harry is reborn as Frieza, the Saiyans' natural strength and warrior spirit would pose a great threat to him. They might not understand his new - found combination of magic and Frieza's powers and see him as an even greater danger.
In this type of fanfiction, Voldemort could still be the main antagonist. But the way Harry approaches him would be very different. With Riddick's influence, Harry might see Voldemort as just another powerful enemy to be taken down in a more direct, perhaps violent way, rather than through the more magical and somewhat convoluted ways in the original series.