Who could be the main antagonist in a 'Harry is turned into a girl' fanfic?

It could be a villain who wants to steal all the cookies in the world. This villain sees Android 18's new - found love for cookies as a threat to his plan, so he tries to stop her from spreading the joy of cookies.

There could be a group of mean - spirited fairies. They see Sakura as an intruder in their territory, which might be a beautiful garden that Sakura often visits. To drive her away, they use their fairy magic to turn her into a cat, thinking that she will be less of a threat in that form. And they keep thwarting her attempts to turn back into a human throughout the fanfic.

A powerful and jealous digimon who has always been envious of angewomon's status and power could be the main antagonist. They might have found a way to turn her into a keychain to get rid of her.

Maybe it's a group of purist wizards who form a secret society. They are determined to 'purify' the wizarding world by getting rid of anyone or anything that is not a normal human wizard. Harry, as a monster girl, becomes their prime target. They use dark magic and underhanded tactics to try and capture or kill Harry.

Perhaps a powerful sorceress. She could be jealous of Robin's connection to Batman and the other heroes, so she uses her magic to turn Robin into a girl as a way to humiliate and weaken him. The sorceress could then try to use Robin's new form to her advantage, like trying to make Robin turn against the heroes or something.

Another possibility is that the main antagonist is an evil scientist who was responsible for Ash's transformation in the first place. This scientist could be trying to create some sort of chaos in the Pokémon world by turning a well - known trainer like Ash into a girl. And now, Ash as a girl has to stop this scientist from causing more harm to the Pokémon world.

It could be a rogue wizard who wants to use Harry's new merman form for his own evil purposes. Maybe he wants to study Harry's transformation to find a way to create an army of half - human, half - merman creatures to take over the wizarding world and the underwater realm.

It could be Voldemort. He might see Harry's new snake form as a way to either use him for his own evil purposes or as a threat to his power. Since snakes are often associated with Slytherin and dark magic, Voldemort might try to control Harry.

It could be Voldemort. He might see turning Harry into an elf as a way to weaken him. Since elves are generally seen as lower in the wizarding hierarchy, Harry in this form would be less of a threat to Voldemort in the eyes of many wizards.

Maybe the main antagonist is a jealous rival. This rival is envious of her abilities and status, so she uses a forbidden magic to turn her into a card. The rival then tries to take her place in the story, but her friends start to suspect something is wrong and begin to investigate.