Look there are a lot of defining moments in Gravity Falls but I think the most defining one was when the exact clone of Dipper was literally dying and said, “Oh boy. Don’t look now. It’s okay, dude. I had a good run.” and honestly, I think that says everything we need to know about Dipper’s personality and I invite you to imagine what would have happened if the real Dipper had actually gotten hurt in the show.
It really impresses me the lengths Alex and the crew go to make Stan out to be a great caretaker. This scene melts my heart, because with all the party hosting and “ripping off suckers” Stan is busy with, he makes sure he’s there to cheer for Mabel when she needs him–not only showing how supportive he is but that he’s been paying attention to her all night.
I can see why she trusted him when Dipper didn’t. Even with what happened in Dreamscaperers, Stan does show a bit more love and support toward Mabel. Maybe that’s because Dipper’s always off doing his own thing, but even so you can tell he’s got a soft spot for the kid.