Who could be the antagonists in a 'Harry Potter and His Little Sister' fanfiction?

Voldemort's remaining followers could be the antagonists. They might see Harry's little sister as a way to get revenge on Harry or as a potential tool for their dark purposes.

In a 'Harry Potter and His Little Sister' fanfiction, the sister could be a new student at Hogwarts when Harry is in his later years. She struggles to fit in because of being Harry Potter's sister. Harry has to help her deal with the pressure, make friends, and also face the threat of a new dark wizard who has a vendetta against the Potter family.

It could be Draco Malfoy. He might not like the idea of Harry getting a second chance at the OWLS and tries to sabotage him. Maybe he spreads rumors about Harry not being worthy of a retake.

One possible antagonist could be a jealous rival among the pirate gangs. This person might envy Harry Hook's sister's skills or popularity. Additionally, a corrupt official in the Isle of the Lost who wants to keep the status quo and sees her as a troublemaker could be an antagonist. Also, if there are any ancient curses or dark spirits on the isle, they could turn against her and try to stop her from achieving her goals.

There could be some old - fashioned professors at Hogwarts who are against Harry's unorthodox ways of making his mark. They believe in the old - established ways of teaching and practicing magic and see Harry as a troublemaker who is disrupting the order of things at the school.

It could be a group of dark wizards who are jealous of Harry's status and see Lemon as a way to get to him. They might try to kidnap her or manipulate her to get Harry to do their bidding.

The antagonists could be a group of corrupted Ministry of Magic officials. They have turned to the dark side for power and are trying to rewrite the laws to suit their evil plans. Harry, being the hero, sings 'This is War' to expose their wrongdoings and fight against their tyranny.

Maybe there's a powerful and corrupt wizard in the Ministry of Magic who doesn't want Harry to have an independent means of travel like the yacht. This wizard could send his minions to disrupt Harry's work, or even create false laws that would make building the yacht illegal in the wizarding world.

The Death Eaters could be the antagonists. Even though Voldemort is gone, some of his followers might not want Harry to succeed in building a starship as they fear it could bring more power to Harry and his friends, and they still hold grudges against him.

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.