She is voiced by Chantel Strand who also voiced Kelly in Barbie in the Nutcracker, Barbie as Rapunzel, Barbie of Swan Lake, and Kelly Dream Club.
Cassie is a small, pink dragon with light blue spots and yellow spikes. She has blue eyes, visible eyelashes, and a pair of white horns protuding from the sides of her head. She wears a blue, orb-shaped dragon badge.
Cassie is the smartest of the group, often times having a vast amount of knowledge about much of Dragonland (with only Quetzal surpassing her in knowledge).
Being the middle child her family (35th of 72, later 74 siblings), she often takes great responsibility to resolve issues within her family, such as fights, departures of older siblings, and nurturing younger siblings whenever her parents are unavailable.
She is notably shy, and becomes very uncomfortable whenever she meets new friends. However, when she gets to know them more, she becomes much more comfortable around them.
Whenever she gets really upset, she shrinks to the size of a mouse, and often times retreats to cry it out. When she cheers up, she reverts back to her normal size.
- Her actual first name may be "Cassandra", as Cassie is the informal version of the aforementioned name, however she is never mentioned as Cassandra at any point within the series.