Part one of my dump of the old concept art and drawings I've done for my Gravity Falls AU called 'Static in the Brain'.

Last three pieces of art are for Bill in the 80s hence why they are wildly different from the big thicc boy in the rest of the art.

The synopsis:

What if all the possession and jumping in and out of the mindscape of Ford had some....long lasting effects? That's what this AU is about; in a nutshell. Ford has brain damage in the form of static rifts causing what is, essentially at its core, dementia. This has created an intense personality shift to the point he's barely recognizable as the loving, if eccentric, Grunkle Mabel and Dipper once knew. Little bits and pieces of Bill left behind are warping him into the exact kind of loyal sadistic maniac Bill wanted him to be....and it results in Ford accidentally summoning Bill out of the Theraprism while in a manic state just so he could see him again, ending with deals having to be struck and both Stanley and Stanford 'married' to the demon and prisoners inside the Fearamid (now hidden in the forest close to the Mystery shack) in exchange for Bill keeping all the weirdness contained within it, and swearing he won't kill or permanently maim any member of the Pines family.

However; just like Ford has changed, Bill has too. His time in the Theraprism, though cut short has taught him a few things about himself and his relationships with others so....while he's made these deals, he's lenient....mostly. He genuinely worries about Ford's condition and feels guilt that he made him this way.