Basic Story: Wendy and Soos go on similar adventures to the canon Gravity Falls.
Characters: Wendy and Soos take Dipper and Mabel's place. Dipper and Mabel are teenagers that work at the Mystery Shack. They don't know Dipper and Mabel know about the "mystery stuff."
Pacifica basically takes Robbie's place (and dates Dipper) and Buddy Gleeful takes Gideon's. Robbie is Soos's schoolyard bully.
Wendy and Soos are about 12 while Dipper and Mabel are around 16 years old.
Grunkle Stan and Bill Cipher do not change age/personality/roles.
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Other: Bipper is the same, too. If you have guts, you can look at the Tumblr page for the AU and maybe find some fanart of him and the kids.
