Anastasia and Drizella

Anastasia is an antagonist that appears in Castle of Dreams in Kingdom Hearts Birth by Sleep. One of Cinderella's wicked stepsisters, she is loyal to Lady Tremaine, her mother, and will do all in her power to get in cohorts with the handsome Prince Charming by making Cinderella's life miserable.

Kingdom Hearts Birth by Sleep
When a ball is held at the Castle of Dreams, all unmarried women are invited for the prince to find a bride. Anastasia, along with Drizella and Lady Tremaine, attempted to keep Cinderella from going along by giving her endless chores to finish and preventing her from finding a suitable dress.

When Ven and Jaq make it for her, she and Drizella tear it apart saying she had stolen their materials. But their plot failed when the Fairy Godmother makes a new dress for her and a pumpkin carriage to transport her to the ball. She is unable to identify Cinderella during the party because she is too far away from their direction.

After the ball, Prince Charming asks the Grand Duke to search for Cinderella with the glass slipper. When he finally reaches their house, she attempts to make shoe fit her oversized foot, but Cinderella proves to be the one. Lady Tremaine then summons a powerful Unversed to kill Cinderella. This act, however, causes a firebomb to drop on the three women, killing them.

Origin
Anastasia first appeared in the 1950 Disney film, Cinderella. She was cruel and unkind to Cinderella, and does not want her to go to the ball. When the footman tries to fit the glass slipper on Anastasia's foot, she at first thinks her foot fits, but it does not. Anastasia later appears in the film's sequels, Cinderella II: Dreams Come True and Cinderella III: A Twist in Time, as well as the TV series, Disney's House of Mouse.

Trivia

 * Anastasia is one of the few film antagonists featured in the Kingdom Hearts series who is not a boss.
 * As seen in Cinderella II and Cinderella III: A Twist in Time, Anastasia was shown not to be as cunning or wicked as her mother and sister. Both movies show her seeing the error of her ways and instead being Cinderella's friend.