Cassidy Purdue is a pre-made Sim who appears in The Sims 4 base game. She is one of six characters in five households who are included in the Gallery that ships with the game. She lives with her brother, Ollie, who may be her twin, as they are both young adults and 20 days away from becoming adults.
Not much is known about her other than her traits and that she has the Musical Genius aspiration. Like all Sims in the Gallery, she is unemployed and has no skills.
Cassidy shares her appearance with one of the default characters in Create a Sim, and appears on the cover art for The Sims 4, along with Ollie.