Frisk regularly does the Impossible
So... Plot seed~
Frisk regularly does the impossible. This time, the impossible is just a lot more impossible than usual, but that doesn’t stop them from getting it done. Frisk manages to reset the time line far enough back that Chara is still alive and hasn’t eaten the buttercups yet. Asriel is still alive. The monsters still have hope.
THERE IS NO NEW WAR WITH HUMANS. Asgore never declares war on humans... It’s up to the Plotseed adopter (? is there a better word for that?) whether or not the other humans ever fall, or if they stay in the underground or have to find a way home. If they stay in the underground, are they still around when Frisk gets there? Is Chara still alive when Frisk gets there. Personally, I’ll give bonus Kudos to whoever decides that due to some weird quirk of monster adoption and/or Boss Monsters, Chara is aging like a Boss Monster instead of a human (Sooo... rather slowly... so still a teenager and thus around when Frisk shows up 8D)
The kicker to the whole idea? Chara knows about a genocide run timeline, a neutral timeline, and a Pacifist run timeline all from the get go. They remember becoming the demon that comes when you call it’s name, and they remember Frisk arguing for a peaceful route. They remember murdering Flowey, and hugging Asriel before he turns back into a soulless flower, and they’re determined not to let that happen again. Only the time when Chara would have commited suicide rolls around... and Asriel starts acting strange because now he’s remembering too. Then Sans Remembers on the day Frisk came to the underground (or not... o.O Sans is ambiguous on how much he figures out of what’s going on anyways...)
Then Frisk comes back.. and didn’t remember until the day they fell to the underground.
So what happens? Are the other fallen children still around? Did they find a way to get the Fallen children home safely? If so, did anyone believe them about monsters and magic under the mountain? are there new legends or did the humans start working on a way to break the barrier and free everyone? If so Did Frisk meet anyone in new and different ways? If not, did the fallen children stay in the underground, making lives for themselves? Did they end up changing because of living with the magic? Are they still alive? How long did it take for more humans to fall? Did they age and eventually die and donate their souls to the monsters for breaking the barrier? How do the monsters react in either situation?
It would thrill me to see someone write this XD...
I may eventually get to it.. but maybe not.