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Dipper is a 12-year-old (13-year-old by the end of the series) boy who, along with his twin sister Mabel, is sent to spend his summer vacation in his great uncle's tourist trap, The Mystery Shack. He endeavors to uncover the secrets of the fictional town of Gravity Falls and to find explanations for assorted strange situations.
Main characters. 1  Dipper Pines (voiced by Jason Ritter) - The 12-year-old twin brother of Mabel Pines, born 5 minutes after Mabel. He is armed with the journal marked 3 that he discovered in the woods. 2  Mabel Pines (voiced by Kristen Schaal) - The 12-year-old twin sister of Dipper Pines, born 5 minutes before Dipper. Mabel is an eccentric, buoyant, and energetic optimist, who expresses herself through an assortment of colorful knitted sweaters, as well as her skills at various arts and crafts.