Dude, what if Adventure Time and Gravity Falls have a linked conspiracy thing?! Gravity Falls' apocalypse theory is caused by fallout... It would create Ooo!!!!!!!!!!Billy!! Explains the six fingers on the book! Lololol!!
Billy survived the war? I have a theory that I have NOT backed up. Gravity falls. Mushroom War. Bravest Warriors. Beth and Chris along with many others move back to Earth. Finn is born as Chris and Beth's son. They are assassinated. Jake adopts Finn. Adventure Time takes place. eh?
I thought of that too, but Finn is blond and blue eyed. A child conceived between a Caucasian person and Asian person tends to have dark/light brown hair and brown eyes. And it was Jake's parents who adopted Finn, as seen in Memories of Boom-Boom Mountain.
I only got hooked on Gravity Falls this week, and as a long term Adventure Time fan, this just made my brain short circuit. How didn't I think about the six finger connection before? Seriously. Awesome. I LOVE IT!