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Marnie Piper, portrayed by Kimberly J. Brown in the first three films, Sara Paxton in the fourth film, is a character throughout the Halloweentown film series.
Marnie is the oldest daughter of Gwen and William Piper, the granddaughter of Aggie Cromwell, and the older sister of Dylan and Sophie Piper. She is the main protagonist of the series, a young witch who has always loved the holiday of Halloween. Marnie is 13 years old in the first part, about 15 years old in the second part, about 17 years old in the third part and 18 years old in the final movie. She is a pretty and headstrong individual, especially when it comes to magic. Like her grandmother and her sister, she has a sixth sense or precognition power as well as being an expert broomstick flyer. She is the character who uses magic as much as she can but also cares about it and tries very much to save Halloweentown and her magic.
In Halloweentown, the 13-year-old Marnie discovers for the first time about her witch heritage and becomes excited to start her training to be a witch.
In Halloweentown II: Kalabar's Revenge, 15-year-old Marnie and her family combine their magic and create a portal that can be opened at any time around the year to stop a warlock from taking over the worlds.
In Halloweentown High, 17-year-old Marnie bets on her family magic to persuade the Halloweentown Council to reunite the worlds of Halloweentown and the mortal world.
In Return to Halloweentown, 18-year-old Marnie attends Witch University in Halloweentown and discovers a great secret about her family. She becomes Queen regnant of Halloweentown for one night, but uses the chance to apparently destroy the gift with the help of Gwen, Dylan and her genie friend, Aneesa, but only passes it on to Dylan, the one person she trusts not to abuse its power.