Speaking of the Overworld, I had a thought/idea for a comic/ending or the like.
It's...sorta depressing, though. In some ways, even more so than the Genocide ending. Though I haven't really thought of it's true ending yet, so... I dunno.
Frisk manages the pacifist route. Overworld opens up. But...humanity isn't nice. Chara proves that by existing. It doesn't go right. Papyrus dies, Sans gets even more depressed, the monsters are treated like scum.
So Frisk resets, to try again, and see what can be done to fix it. But there's no ACT function for humans. It's not so simple as that. It doesn't work. So they reset. And each time they fail, they reset again. But...it's hard. While they learn more about what they have to do, you can only hold so much knowledge in your head, especially when you're transitting through timelines. But in one timeline, the Notebook gets tossed into the Core (or something). They can write in it between timelines, now. Keep track of things. Keep a journal, in order not to go insane. When everyone acts the same over and over again...Flowey's viewpoint starts to become understandable. Sans, at least, keeps some vague memory of each timeline, so he acts differently, even if he's not fully aware. Flowey too, though they're more mocking than uplifting.
Frisk knows they can't keep going like this. Chara's getting stronger each time they fail, that little voice saying that there's no such thing as people, just automatons, it's just a roller coaster ride that you can't get off of, with the same puppets every time, the same loops.
So Frisk does research, of a sort. Turns out, if you tell someone with sufficient Determination, they can remember. Sans mostly has that, once Frisk finds the right thing to say by trial and error. It's only been a thousand or so runs so far. With Sans able to remember, to work with Frisk across timelines, keep the mood up a bit more (knowing that he can work to get a happy ending, and remembering that, has improved his mood a bit, though the depression affecting Frisk means it's not all there, and he can't remember as well as Frisk can). They work on it. Failing, again, and again, trying to fail better.
It feels like it's not working. And worse, Flowey's gotten smart to it. He's able to remember across the resets too, though being able to remember being saved means he's not as terrible, he still doesn't have a soul at the start of each reset. Bringing him back as Asriel ends up being the first step in each reset. But he's already been through this business with pointlessness. It's hard to stay optimistic. And once the journal pages get full...what then? They've already spent a run tossing stacks of notebooks into the Core. It didn't work. They don't have the same attachment to someone the Notebook did. Frisk starts writing on the 'Walls'. Starts considering whether Gaster had the right idea, accidental or no. There's three of them with Determination, they can all affect the world enough to keep each other from going insane from the repetition, but it's hard to stay Determined when the happy ending always seems out of reach. And if they do achieve it, what then? If Frisk dies of old age, something he's done once or twice with neutral runs in an attempt to stay sane; will the world reset again? How do they keep it going once they achieve their goal. They can't exactly test a way to keep it going without Frisk if they want to actually get the happy ending yet.
It's run number four thousand and something, we lost count a few dozen or so ago. We...we can't give up, but...Something big always goes wrong, eventually. Sans never remembers anything from after I die in them. I don't know what to do anymore. Sorry. The ones where we can't keep track of what happened, where none of us remember anything...those are the ones that scare me most. What if we never get out of them?