Bill Cipher was long term villain of the story. And then he turned to stone after the big fight, a fight that almost destroyed the world.

And then you moved to Gravity Falls. Hearing the story of the cruel man who almost destroyed the world made you curious. So every day you visited him, his stone body stayed in the same position every day. Eventually you fell in love with him, and would sit with him. Telling stories and tales of your every day life and how things were in the small town.