One possible plot could be that the villain recruiters target a young and impressionable character from a new Disney story. They try to convince this character that the villainous way is the path to power and freedom. For example, they might offer the character magical abilities in exchange for joining their ranks. The story could then follow the character's internal struggle between good and the allure of the villains' offers.
Maleficent would be a great character to include. Her powerful magic and commanding presence would add a lot to the story. She could be either a recruiter or a target of the recruiters. If she were a recruiter, she could use her intimidation tactics to persuade others. If she were a target, it would be interesting to see how she fends off the recruiters, as she is not one to be easily swayed.
Cruella de Vil from '101 Dalmatians' has an origin story that might be related to her obsession with fashion. Her desire for a fur coat made from the Dalmatians' skins was extreme. It could be that her upbringing in a fashion - centered world made her view the dogs as mere objects for her to achieve her sartorial dreams, thus making her a villain.
Well, a big theme is the humanization of the villains. In fan fiction, writers might show that the villains have emotions and reasons for their actions that we don't see in the movies. For example, Cruella de Vil might be shown as having a troubled past that led to her obsession with fur. Also, the theme of alternate universes is quite popular. It could be an alternate universe where the villains are the heroes or where they succeed in their evil plans. There's also the theme of love and relationships for the villains. Maybe a fan fiction about Ursula falling in love with someone unexpected.
One common theme is envy. Many Disney villains are envious of the heroes or others' good fortune. Like Scar in 'The Lion King', he was envious of Mufasa's position as king.
One idea could be having Maleficent and Ursula team up. Maleficent could use her dark magic to help Ursula get more powerful in the ocean realm. Maybe they plot to take over both the land and the sea. They could start by causing chaos in the kingdoms near the shore, like making storms and scaring the fishermen.
Sure. One popular Disney villain fan fiction is about Ursula from 'The Little Mermaid'. It imagines her backstory in more detail, like how she became so power - hungry. Another one could be about Maleficent before she put the curse on Aurora, exploring her relationship with the other fairies. There's also some fan fiction focused on Jafar from 'Aladdin', showing his rise to power in a different light.
One reason Disney villain origin stories are compelling is the element of tragedy. For example, Maleficent. She was once a kind fairy who was betrayed. This betrayal led to her transformation into a villain. It shows that often villains are not born evil but made by circumstances.
Create complex relationships between the villains. For example, show how they might initially distrust each other but then find common ground. This adds drama and depth to the story.
Villain origin stories drive the plot. In 'Aladdin', Jafar's ambition and his backstory of always being power - hungry lead to his various schemes against Aladdin. His origin story sets up his goals and actions throughout the movie, which in turn moves the story forward.