One plot idea could be that Lady Tremaine has a change of heart. Maybe she realizes how cruel she has been to Cinderella after seeing Cinderella's unwavering kindness. For example, Cinderella saves Lady Tremaine from a dangerous situation in the forest. Another idea is a backstory for Lady Tremaine, showing what made her so bitter and mean in the first place. This could make the readers sympathize with her a bit. A third plot could be a competition of wits between Cinderella and Lady Tremaine, where Cinderella outsmarts her stepmother at every turn, but still manages to keep her grace and dignity.
A possible plot could be that Lady Tremaine is forced to work in the palace as a servant as a punishment. Cinderella, being the kind - hearted person she is, decides to show her mercy. At first, Lady Tremaine is bitter, but over time, she comes to respect Cinderella. They could then have a series of interactions where Lady Tremaine tries to atone for her past misdeeds and Cinderella helps her become a better person.
Their relationship could develop through shared hardships. For instance, if the kingdom is under attack and they have to hide together. Cinderella's kindness during this time might make Lady Tremaine question her past actions. Another way is if Lady Tremaine gets sick and Cinderella takes care of her, slowly breaking down the walls of hatred.
One idea could be that Cinderella has a special power that she discovers while living with the four knights. For example, she can communicate with animals and they help her solve a mystery in the manor.
Well, a plot idea could be that Cinderella and Prince Charming have a big fight right after their wedding. Maybe Cinderella feels suffocated by the royal life and Prince Charming doesn't understand her at first. But then they go on an adventure together outside the kingdom and rediscover their love. Another idea is that there's a curse on Prince Charming that makes him turn into a beast at night. Cinderella has to find a way to break the curse while still loving him in his beastly form. Also, we could have a story where Cinderella is kidnapped by an evil witch who wants Prince Charming for herself. Prince Charming has to rescue Cinderella and prove his love is true.
One idea could be a modern - day Cinderella where she is a struggling artist in a big city and meets her prince at an art gallery. Another could be a Cinderella in a steampunk world, with all the mechanical gadgets and a unique take on the classic story. Or perhaps a Cinderella fanfic where she is a mermaid - like creature in an underwater kingdom and the prince is a sailor who discovers her world.
One idea could be to explore what would happen if Lady Jane's reign was longer and more stable. She could have time to implement more reforms in the kingdom. Another could be a love triangle between Lady Jane, a commoner, and a nobleman, adding a romantic twist to the historical setting.
One plot idea could be that Naruto and Satsuki are on a joint mission in a foreign land. They have to rely on each other to survive and in the process, they discover new sides of each other. For example, Naruto learns about Satsuki's insecurities behind her tough exterior, and Satsuki sees Naruto's determination in a different light.
In the original story, Lady Tremaine is the villain. But in a fanfiction, they could have a more complex relationship. For example, instead of just hating Cinderella, Lady Tremaine might have some hidden motives that are not purely evil. Maybe she was jealous because she herself had a hard past and saw Cinderella as getting all the good things she never had.
One plot idea could be that Bella is transported into the Cinderella story. She uses her modern - day knowledge to help Cinderella in a new way, like teaching her self - defense so she can stand up to her step - sisters. Another could be that Cinderella has some of Bella's traits, like being a bit clumsy at times but still having a heart of gold. A third idea is that Bella discovers that Cinderella's fairy godmother is actually a powerful witch from her own world, and they have to team up to defeat an evil force that threatens both of their worlds.
One idea could be that Cinderella is a secret superhero. By day she endures the cruelty of her stepfamily, but by night she uses her superpowers to help the poor in the kingdom. Another could be that the prince is actually under a curse too, and only Cinderella's true love can break both their curses. Or perhaps Cinderella is an inventor in disguise, creating amazing gadgets that she uses to outwit her stepfamily.