Piper Hart is the younger sister of Henry Hart on the Nickelodeon TV show Henry Danger. She often worries about her social life and is constantly using all kinds of social media in all aspects of her life. She often taunts or pranks Henry for her own enjoyment and seeks ways to get him into trouble or cause trouble for him at home. She constantly berates and disobeys her own parents as well, getting little to no consequences. She causes so much trouble that even her own parents believe she'll end up in prison one day. Piper is very similar in many ways to Megan Parker from Drake & Josh.
She is played by Ella Anderson.