Ally bears a strong resemblance to her mother. She has long blond hair with white/light blue highlights, and like her mother, tied in a black hair ribbon. She has light blue eyes and red lips
Dressed in a similar style to her mother's, Ally wears a baby blue collar dress with black lining around each sleeve and flower-shaped buttons with a flower pattern embroidered on the rim. She wears a black bow tied around her waist and a watch on her left wrist. There is a second layer underneath the dress that is striped black and white. She wears tights striped with baby blue and white coloring and wears black high heels with light purple lacing.
- She is the fourth new character to appear on the show.
- She seems to have the same curious personality as Alice.
- She is misspelled as "Allie" in Return to the Isle of the Lost: A Descendants Novel.