In the beginning, this really haunted Dipper in particular. His form changed, his capabilities changed, his own inner thoughts and instincts shifted and that on top of everything else is terrifying. Suddenly he wore suits, because nothing else felt right. Some part of him hated this, hated the little bowtie and hat and triangular cufflinks because it wasn’t Dipper, it was Bill, and that was wrong.
Sometimes his mouth seemed to run away from him. He’d greet his sister with an overly-exuberant “Hey Shooting Star!” and not quite realize he hadn’t actually called her by name until he caught the look on her face. He’d want to make deals for things he would have done freely before. He’d want to twist those deals to get as much as he could while giving as little – or at least as cruelly – as possible. He hungered for things he never had before, and it scared him.
He got better at handling this with time. He changed some things and adjusted to others. Eventually he came to own the sorts of things he would say and do and want as part of who he was, because instinct or no, he was in control of them. He was not Bill Cipher. He never was, and he never would be, because he had something the demon lacked – he had a basis in and therefore a greater value for humanity, family, and friendship, and this is how he chose to define himself at the core.
