Cyd Ripley is one of the main protagonists in Best Friends Whenever. Cyd is Shelby Marcus's best friend, and the two girls live together in Shelby's house due to Cyd's parents leaving for Peru. Cyd and Shelby discover the power to time travel together by messing around with a science machine. Cyd is a tomboyish, gluttonous, rebellious, and aggressive young teen. She likes getting into trouble, and often gets Shelby and herself into tricky situations.
Cyd is portrayed by Landry Bender.