There's a deviation I found about a post-apocolyptic AU involving both of these cartoons as well as Steven Universe and Over the Garden Wall. It implies that the characters not in the picture are dead. I would assume that in this AU, Star and Dipper are romantically interested in each other since Marco and Mabel are likely dead. I bring this up because while I assume Dipper and Star would have good chemistry with each other, both of them have a plethora of other potential lovers. I'm not sure if they would ever think of getting together. By the way, here is the picture I was talking about.