It would be cool to have a mirror that leads to an evil world, in Gravity Falls that Grunkle Stan finds. Then that evil Mabel finds her way out, and throws Mabel into the evil world, and the evil Mabel makes everyone think of the normal Mabel as mean, evil, and someone they all hate,
Ooh I get it, Evil Mable from a parallel universe...Maybe Gideon was good in her dimension and defeated, and now she's coming through the looking glass...Would make for a great episode. Or maybe she got her hands on one of Gideon's little trinkets and it changed her for the worst, still make for a great episode. ^_^
Yeah, I think Evil Dipper would be a villain that would difficult to defeat, and I imagine that Evil Dipper uses evil ways to get Wendy's loves like hypnotizing her or killing Robbie and then kidnapping Wendy. Also it would be interesting if Prime Dipper and Mabel meant the Evil Dipper and Mabel.
Yeah that's definitely an interesting concept, but I don't really see Evil Dipper caring about wealth, I think it would be a lot more interesting if in the alternative universe, Dipper became evil because he was tired of everyone disrespecting him from calling wimp or even Robbie just being a jerk, so he took over Gravity Falls to make everyone feel his pain. I thought that that would make Evil Dipper a different villain from Prime Gideon.