It could be the pure - blood supremacists. They might see the relationship between Harry, a well - known wizard, and the Veela Queen as an abomination because they believe in the purity of wizard blood and would not accept a union with a non - wizard being like the Veela.
There could also be some jealous Veela or wizards. Maybe there are other Veela who were interested in the Queen and feel threatened by Harry. Or wizards who were envious of Harry's relationship with such a powerful and alluring being. These characters could create all sorts of problems and obstacles for the couple.
The Death Eaters, if the story is set during the time of Voldemort. They would oppose anything that doesn't fit into their narrow view of the wizarding world order. A relationship between Harry and the Veela Queen would be seen as a threat to their idea of a pure - blood dominated society, so they would try to stop it.
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.
Well, one interesting plot could be that the Veela Queen uses her charm to initially draw Harry in, but as they get to know each other, he discovers she has a kind heart beneath her alluring exterior. They might go on adventures together in the wizarding world, facing challenges like dark wizards who oppose their union.
One possible antagonist could be a corrupt wizard in a high - ranking position in the Ministry of Magic's financial department. This wizard might be trying to cover up his misdeeds and would see Harry as a threat to his scheme.
Another possibility is that it's a character related to the Veela community. A Veela elder or a young Veela who is chosen for this special training. This character would bring the unique Veela culture and magic into the story, and their interactions with the wizarding world outside of the Veela community would be an interesting aspect of the fanfiction.
Scarecrow could also be a main antagonist. His fear - inducing toxins could be a real problem for Harry. Harry would have to use his magic to counter the effects of the fear toxin and also figure out a way to stop Scarecrow from spreading it all over Gotham.
Obviously, Harry Potter is one of the main characters as the title implies he is the Veela Prince. Other likely main characters would be his friends like Ron and Hermione. They would probably be involved in helping Harry understand and deal with his new Veela identity.
In addition to Harry and his adoptive Veela family, there might be some of Harry's friends from Hogwarts who are also important characters. For example, Hermione and Ron. They might react in different ways to Harry's new situation. Hermione could be curious and try to research more about the Veela, while Ron might be a bit more hesitant or even jealous at first. Their interactions with Harry as he navigates his new life with the Veela would add depth to the story.
One possibility could be a group of dark wizards who are jealous of Hogwarts' power and reputation. They want to bring it down and Harry, as the champion, stands in their way. Another could be a former Hogwarts student who turned to the dark side and has a vendetta against the school for some reason. They target Harry specifically because he represents everything good about Hogwarts.
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.
One possible main antagonist could be Voldemort still. Even though Harry is now under Sparda's protection, Voldemort would see Harry as a threat and would try to get rid of him. Another could be some of the demons from Sparda's world who see Harry as an intruder or a threat to their plans in the new world order that Sparda is trying to create with Harry by his side.