Dylan Piper, played by Joey Zimmerman, is featured throughout the Halloweentown film series.
Dylan is the middle child and the only son of Gwen and William Piper, the grandson of Aggie Cromwell, the younger brother of Marnie and the older brother of Sophie. Dylan is somewhat of a book nerd as he likes to study more than anything. He strongly dislikes Halloween and everything that goes with magic. Dylan is sarcastic and frequently teases his sisters, especially Marnie. He is the only warlock in the family, but doesn't like to use magic but will use it sparingly to help his family and study. In the first film, he demonstrates meteromancy.
In Halloweentown, Dylan is about 12 years old and remains skeptical about the existence of magic and the supernatural. His hands start to glow at the end of the movie while being mad at Kalabar, indicating he has powers, which he uses to help defeat the movie's antagonist; Kalabar.
In Halloweentown II: Kalabar's Revenge, Dylan tries to reach out to girls, but only ends up getting ditched and only uses his powers twice to help fix the worlds, first using them with his family and Luke to create a new permanent portal between the worlds and then – reluctantly, with the prodding of Luke – to break the spell on Benny.
In Halloweentown High, Dylan doesn't use his powers at all and falls for a girl before finding out she was a pink troll. Though he doesn't use magic at all in this movie, he states that he has tried to apologize to Natalie using magic to speed-up the speaking process.
In Return to Halloweentown, Dylan attends Witch University with his sister and confesses that he used his powers to study rapidly in high school, which is the reason to why he skipped a grade and can attend college with his sister. He also falls for the evil Sinister sisters but they use him to get the gift - his family heirloom, so they can try to take over Halloweentown. Later, he becomes the wielder of the gift but decides to hide it in a book. He ends up using magic a few times in this movie; he speed-reads to get the information on Splendora, admits to using it in high school, and uses it to help "destroy" the gift as it takes three Cromwells to do and only he, Gwen and Marnie were around. This is the most times he uses his powers in the movies.