Arabella is a fashion maven who idolizes Evie and her style. She is glamorous and loves the color lavender.
Arabella copies the outfits Evie wears, but in variants of purple and even has a V-braid hairstyle similar to the one Evie wore in the first Descendants film. She also wears a poison-heart necklace similar to the one Evie owns.
Near the start of the book, Arabella meets Evie and they become good friends. Later, during the Seaside Festival, she steals her grandfather's trident and creates a storm while trying to use it. She is not able to do this and it flies away. The next day Mal, Evie, Carlos, and Jay find Arabella upset and learn that she caused the storm the day before. Hearing this, Mal, Evie, Carlos, and Jay try to find the trident before Uma and her crew can.
Evie designs Arabella a dress for the Collition. She later graduates from Auradon Prep in the novel along with the other VKs and AKs.
- It is unknown which of Ariel's sisters is the mother of Arabella.
- Many theories center around Alana or Andrina being her mother because they are both associated with the color purple, which is Arabella's favorite color.
- Many people believe Arabella is the replacement for Melody since Disney sequels and spin-offs are not canon in the Descendants universe.
- In the web series School of Secrets, someone mentioned in a text message is referred to as Ariel's niece. Whether that person was Arabella is currently unknown.