The approach was always slapping them into the other shoes, and leaving it at that.
Gideon should've been a fake Magician/stage kid who becomes enthralled with the oddities of GF, and eventually finds a place amongst the town. His character would eventually grow as he becomes a true Magician.
Pacifica could've been the local outcast who most can't stand because she's too happy, and neighbor/friend of Gideon, the new kid in town. She'd eventually resolve the issues with her family, and begin to make friends.
Dipper should've been a distant know it all who gathers the magical items for the Mystery Shack via cruel means. He'd stay in the shadows, and would be at odds with most people he encounters.
Mabel should've been the town favorite, the perfect good two shoes who becomes way too obsessed with Gideon. Basically Canon Gideon but as a girl and a flock of men and girls who wish to be her friends.