So, I was browsing the internet like ya do, and found little to NOTHING on the Reverse Grunkles.
So, here's my idea about all that (and extra ideas n stuff)
Stan and Ford switch places. Don't follow yet? Imma explain...
In the show, Ford wrote the journals. In my idea of Reverse Falls, Stanley wrote the journals, and got mixed up in the portal (though it's not Will's idea, Stanley wanted the power for himself and it backfired).
Stanford takes Stanley's identity, living in his old house (The Mystery Shack, though it isn't a shack, just a home).
Stanford is hired at a host for the Tent of Telepathy. (Because he needed work, and Mabel is in
Writing this to explain Demons in Undertale (this is more of a headcanon or theory, but it works so XD )
Demons are Humans with magic. The Mages who created the barrier. However, after a while, Humans began to look at the wizards and witches as freaks, as something worse than Monsters.
It was around this time they were dubbed 'Demons'.
Demon souls are different to Human souls, also, as they can tie themselves to places and posses magic-less Humans (see where I'm going with this?)
Demons also have visible differences, the most common being blood-red eyes. (Catching my drift yet?)
So, what if, a Demon decendant accidently fell into the Und
Mainly writing this to make some sense of this AU XD
Asriel & Chara >> Papyrus & sans
Papyrus & sans >> Toriel & Asgore
Toriel & Asgore >> Undyne & Alphys
Undyne & Alphys >> Mettaton & Napstablook
And finally Mettaton >> Chara and Napstablook >> Asriel
This AU gives Goatchild a happy ending. Life is complete ermahgerd.