I happened to stumble across a fic that I found decent for a while before it jumped off a cliff. It’s an AU where Mabel has bipolar disorder, which prevented her from going to Gravity Falls with Dipper. Somehow, everything happened pretty much the same as in canon despite Mabel’s absence, and Dipper grew up to be a successful paranormal investigator right up until he got murdered. Now Mabel has to investigate.
It is 29 chapters. Buckle up.
Read this if you are sick of Mabel always being the side character in EVERYTHING
Well, you’ve certainly piqued my interest.