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.
A rogue digi - tamer who has gone to the dark side might be the main antagonist. They might see angewomon as a valuable asset in their evil plans. So they use a dark spell or device to turn her into a keychain and keep her captive until their plans are fulfilled.
It could be a powerful dark wizard or sorcerer who has a grudge against angewomon or wants to use her power in some way, so they turn her into a keychain.
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.
In the 'angewomon was turned into a keychain fanfic', it could start with angewomon being caught off - guard by a strange spell. As a keychain, she is carried around by a human or another character. She can't communicate in the same way as before, but she tries to send signals. Her friends notice her disappearance and start to search for her. Along the way, they discover that the keychain has some special powers that could either be a curse or a way to break the spell. They have to figure out how to use these powers and find the source of the spell to change her back.
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.
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.
Well, perhaps it could be about a magical spell that changes angewomon into a keychain. Then the story might follow her adventures in this new form, like being carried around by different characters and experiencing the world from a tiny perspective.
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.
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.