>>99716086I imagine Gaz and Mable's relationship would be similar to Mandy and Dora's, except less evil. Showing a montage of Gaz and Mabel walking around, having fun, all of it while Gaz is deadpan serious and Mabel is laughing and being her silly self, finishing it up with Gaz, without changing her expression, saying something along the lines of "you're the best friend I've ever had".
I wonder if people on Gravity Falls would fall for Zim's disguise. It's a strange town where everyone has brain damage due to the abuse of the memory gun; they might just see him as a kid with a weird skin condition.