It could be a group of rogue hackers from the human world who somehow gain access to the Digital World. They see Angewomon as a valuable target and use their technology to transform her into a doll. Their goal might be to study her digital essence or sell her as a rare digital item in some sort of underground digital market.
A powerful and jealous Digimon could be the antagonist. Maybe a Digimon that has always envied Angewomon's grace and power. This Digimon finds a way to turn her into a doll to get her out of the picture and claim her status in the Digital World.
Perhaps an ancient evil that has been dormant in the Digital World for a long time awakens. This evil entity, with its own twisted sense of order, views Angewomon as a symbol of hope and goodness that it wants to destroy. So it uses its dark magic to turn her into a doll, and the rest of the story could be about the battle between the forces of good, led by the other Digimon and Digidestined, against this ancient evil.
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.
In this fanfic, it could be that Angewomon is tricked by a new, seemingly friendly Digimon. This Digimon has a hidden agenda and uses a strange device on Angewomon which turns her into a doll. Her partner Digidestined is devastated and sets out on a journey. Along the journey, they discover that the key to reversing the transformation lies within the memories Angewomon has left behind in the Digital World's data streams. By retrieving and reconstructing these memories, they hope to bring her back.
It could be a dark wizard or sorcerer who has a grudge against angewomon and decides to transform her into a keychain as a form of punishment or to keep her from interfering with their evil plans.
Maybe the story could start with angewomon getting cursed by an evil digimon. This curse slowly transforms her into a keychain. Her friends then embark on a journey to find a way to reverse the curse. They might face various challenges and meet new digimon along the way.
It could be the person who finds the doll - dragon. Maybe a young adventurer who is curious about the strange doll.
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.
Perhaps the main antagonist could be a dark magic user who was the one responsible for turning Harry into a girl in the first place. Their goal might be to disrupt Harry's life and his role in the fight against the dark forces. This antagonist could continue to create obstacles for Harry as a girl, like trying to prevent him from getting the help he needs to change back or causing trouble for his friends who are trying to support him.
It could be a young girl. She might be the one who stumbles upon the tiny - doll - dragon and decides to protect it. Maybe she has a natural affinity for magical creatures and feels a strong sense of responsibility for the dragon's well - being.
Well, it might be that in a magical realm, the dragon, for some reason like disobeying the magic laws, is magically transformed into a doll. A young girl then takes the doll in and starts to notice strange things. As she delves deeper, she discovers the truth about the dragon and tries to help it regain its true form. There could be all sorts of magical creatures and challenges along the way.