A vision that just came to me moments ago in a dream that I have to get out because HELLO. This summary just flashed before me
"What does one do when despite looking like everyone else, they're still classified as an other? Frisk may seem like a human, but is classified as an everyman. Keeping them barred from being fully human. Chara deals with it by lashing out, attempting to make it so that so few would relate to them that they can no longer be classified as an everyman. Frisk however, can't bring themself to act. Crying and stating docile knowing there's plenty more of them on the assembly line. So when they come across Ink Sans' missing multiversal paintbrush, it seems like they'll finally be forced to act, because the bad Sanses are coming, and for once there's something Frisk is tasked with protecting until it can get back to its owner."
It started with a darkened assembly line of bodies. They start out as Frisk, but when it asks the question, they all turn to Everyman. The sprite from Reaper Bird's amalgamate attacks. It contrasts with Chara jumping from their spot on the conveyor and attacking some. And when it gets to Frisk, it becomes almost more like a storybook. A sad face with tears, a room filled with identical Frisks. Then our Frisk falls from the conveyor belt into a box and the scene changes.
I remember them finding the brush, for? Some reason? In the bottom of an empty meat section of a grocery store.
They grab the brush, not fully knowing what it was, to the disgust of the humans that were in that section of the grocery store. Because it had meat juice on it, so they ask thought it was dirty to touch.
Finding it immediately gives them two companions. Dream Sans (which? Acted more like Swap Sans so I'm gonna say Swap Sans instead) and Swap Papyrus.
Frisk carries it, walking alongside their parent as Swap Sans energetically is running around aisles. Swap Papyrus, being chill as his AU self is, notices that despite it being monochrome, he recognizes that paintbrush as belonging to someone who creates and protects AUs. Ink Sans.
But also says that since it's seemingly misplaced, that means that the "Bad Sanses" (Error, Nightmare, etc) will probably be looking for it just as actively as Ink, since it can be used to destroy AUs too. Since the pen is mightier than the sword.
I think I was just given a prophecy by Toby Fox himself because why did I just have a whole ass storyboard opening in a dream a few minutes ago. I haven't been into undertale since it's height and amino 😭 where is this coming from