Who could be the main antagonist in a 'deku turns into a girl fanfic'?
Perhaps an anti - hero who believes that heroes should be perfect and unchanging. They see Deku's transformation as a sign of weakness and decide to target him. They try to expose Deku's new form to the public to ruin his reputation and make people lose faith in heroes in general. They think that by doing so, they can reshape the hero society in their own image.
It could be a villain who is obsessed with creating chaos through strange transformations. This villain might have targeted Deku specifically because of his status as a rising hero. They want to see how Deku will cope with being turned into a girl and use it to undermine his confidence and hero image.
There could be a mad scientist - type villain who is conducting experiments on quirks and human transformation. Deku accidentally becomes a part of their experiment when they test a new device near him. This villain then becomes the main antagonist as they try to keep Deku in his female form for further study and to use him as a weapon against the hero community.
Who could be the main antagonist in a 'Deku Turns into an Adult' fanfiction?
A new villain could emerge who is specifically targeting adult heroes. Since Deku has now become an adult, he becomes a prime target. This villain might have a grudge against the hero society's adult leadership and see Deku as a symbol of that.
Who could be the main antagonist in a 'gumball turns into a girl fanfic'?
It could be an evil wizard who was the one who actually caused Gumball to turn into a girl in the first place. The wizard has some ulterior motives, like using Gumball's new form to gain power or to cause chaos in the town. He tries to prevent Gumball from finding a way to turn back and keeps creating obstacles for Gumball and her friends.
Who could be the main antagonist in a 'link turns into a girl' fanfic?
Ganon could still be the main antagonist. Even though Link has turned into a girl, Ganon's goal of taking over Hyrule remains the same. He might underestimate Link in her new form, which could give Link an advantage. For example, Ganon might not expect the girl - Link to be as strong or resourceful as the male Link, but she proves him wrong.
Who could be the main antagonist in an 'izuku turns into a girl fanfic'?
Perhaps a jealous classmate who has always been in Izuku's shadow. Now that Izuku is a girl, this classmate sees an opportunity to undermine her. They spread rumors about how Izuku's transformation is some sort of cheat or that she's not the same reliable person she was as a boy. This classmate's actions and attempts to sabotage Izuku would make them the main antagonist.
Who could be the main antagonist in an 'ash turns into a girl fanfic'?
It could be a jealous trainer who doesn't like the attention that girl - Ash is getting. This trainer might try to undermine her at every turn during Pokemon battles.
Who could be the main antagonist in 'Aang turns into a girl fanfic'?
There could be an ancient evil spirit that was released when Aang turned into a girl. This spirit feeds on chaos and the disruption of natural order. It sees Aang's transformation as a sign of the world being out of balance and tries to make it even worse. It might target Aang specifically because he is the Avatar and his new form gives it an opportunity to create more disorder.
Who could be the main antagonist in a 'sonic turns into a girl' fanfic?
Maybe a new character could be the main antagonist. This character could be jealous of Sonic's speed and popularity. So, when Sonic turns into a girl, this antagonist sees it as a chance to frame Sonic for various crimes in this new form. This would make Sonic's friends doubt him and isolate him, all part of the antagonist's plan to take Sonic's place as the hero of their world.
Who could be the main antagonist in an 'Edward Elric turns into a girl fanfic'?
Perhaps a new alchemist who is jealous of Edward's skills, even in his new form. This antagonist might see Edward as a girl as an easy target to discredit. They could spread rumors about how Edward's transformation has made him less capable in alchemy, when in fact it's just their way of trying to undermine him.
Who could be the main antagonist in 'harry turns into a monster girl fanfic'?
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.
What could be the plot of a 'deku turns into a girl fanfic'?
Well, one possible plot could be that Deku accidentally drinks a strange potion created by a villain. This potion has the side - effect of changing his gender to female. At first, he's shocked and confused. But then, he realizes that he can use this new form to his advantage in hero work. For example, he might be able to infiltrate a female - only villain group more easily. He also has to deal with his friends' reactions, some are surprised while others are supportive and help him adjust to his new body while still being a hero.