who plays grenda from gravity falls
T. J. Miller plays as Robbie Valentino. Frank Welker voices Gompers, a goat who lives in the forest of Gravity Falls. Voice acting veteran John DiMaggio plays Manly Dan, a strong lumberjack and father of Wendy. Niki Yang and Carl Faruolo play Candy Chiu and Grenda, Mabel's two best friends, respectively. Toby Determined, a journalist for Gravity Falls' Gossiper, is voiced by Gregg Turkington, and Will Forte plays Tyler Cutebiker. J. K. Simmons joins the cast as of season 2, episode 12, A Tale of Two Stans, and plays Stan's twin brother, Stanford Fillbrick Ford Pines.