Princess Isabel is a precocious girl who is very creative and loves to draw and invent. She is also shown to love her older sister and spending time with her. Like another precocious Princess, Isabel values keeping promises no matter what to the point where she dislikes people breaking promises they made her. Also like Sofia, she loves doing her research and places a lot of faith in books she's read. Unlike her older sister, Isabel did not like Dia de los Muertos because it reminds her that her parents are dead until Elena explained why she loves it.
At ten years of age, Isabel is a tanned skin girl, with a slender figure and amber-brown eyes, much like her sister's. She is much shorter than Elena, and has long dark brown hair tied back with a blue ribbon.
Her signature outfit is a bright blue dress with short puffy sleeves decorated in flowery patterns. Her skirt measures up to Isabel's knees and tied around her waist is a blue bow. Isabel wears white tights and black shoes with blue bows.
For formal occasions, Isabel is seen wearing a pink ballgown, with a yellow ribbon in her hair.
Isabel will appear in the upcoming special, Elena and the Secret of Avalor. When the evil power-hungry sorceress Shuriki invaded the Kingdom of Avalor, Isabel and her grandparents were placed inside an Enchanted Painting for their protection while her sister, Elena, ended up trapped inside the Amulet of Avalor when she confronted Shuriki alone. Forty-one years later, Isabel and her grandparents were released from the portrait and helped Elena defeat Shuriki and liberate their kingdom.
In the series that serves as the special's sequel, Isabel is a major character alongside with the rest of her family.
- Isabel is an inventor, just like Harley Diaz, Jenna Ortega's character in Stuck In The Middle.
- It is currently unknown what the age gap between her and Elena is.