Marnie Piper is a fictional character from the Disney Channel movie series, Halloweentown. She is portrayed by actress Kimberly J. Brown and is known for her adventurous spirit and strong connection to magic. Marnie is the daughter of Gwen Piper, a witch, and she discovers her magical heritage as she navigates the challenges of being a teenager. In the series, Marnie often battles dark forces to protect Halloweentown and its inhabitants. She is characterized by her determination to embrace her witch identity and her desire to unite the magical and human worlds. Marnie's journey highlights themes of family, courage, and self-discovery.