Ally bears a strong resemblance to her mother. She has long blonde 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 her mother.
- She is misspelled as "Allie" in Return to the Isle of the Lost: A Descendants Novel.
- The book Freddie's Shadow Cards reveals several things about her. It indicates that she is the captain of the Auradon Acapella group, and owns an orange and white cat named Dino. While her father is confirmed to be alive, he is not named in the book.