I love thinking about the Mystery Twins at Camp Campbell.
Everyone is unnerved because Mabel is so much like David but...less annoying?
Dipper being extremely jumpy and skeptical of Harrison because he thinks Harrison is Bill.
Dipper and Mabel telling Nerris all about the mythical creatures they've seen (and unicorns are jerks).
Dipper actually really likes playing Pixies and Pythons with Nerris and they become great friends.
Mabel loves knitting camp and makes EVERYONE sweaters
Waddles vs the platypus. (Waddles wins, but they both live)
Neil and Dipper always have great conversations about science, but Dipper always turns to the science of magic and Neil I just "nooooo"
The twins going on adventures with Nikki.
Mabel constantly poking Max and trying to mold his mouth into a smile.
David and Dipper talking about birds and other animals they've seen.
Gwen and Mabel talking about monsters/mythological creatures they've dated.
Gwen believes EVERYTHING the twins say.
Dipper appreciating Dolfs art and giving constructive criticism while Mabel is finger painting next to them.
Dolf also gives Mabel constructive Criticism.
Dipper getting a crush on Erid because she reminds him of Wendy.
Just... Mabel and Preston. No more needs to be said about these two.
Nerf tries to beat up Dipper but MABEL TO THE RESCUE.
They actually become pretty good friends with Nerf.
Dipper talking to Space Kid about the stars and alternate dimensions (Space Kid is INTRIGUED)
They've seen enough magic, and talk to Stanford after Camp, about helping Harrison get his brother back.
Stanford actually takes Harrison under his wing and teaches him to control his powers because the sweet child DESERVES IT.