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Shifttale is an Undertale AU by LunaIzMeh.
Flowey is known as Viney, a purple Wisteria. He is calm, opposed to him as Asriel, who was reckless.
Toriel hates humans because every child that fell left the Ruins, leaving her alone. She acts rude to the protagonist, jeering them and not helping them with puzzles.
Sans overworks for both interest and a cover-up for his research, making people think he is working, when in reality he is studying the timelines. He is aware of what happens in SAVEs and resets.
Papyrus tries to be kind, though he is actually pretty hotheaded. He tries to capure the protagonist, knowing that if the barrier is broken, he won't be bugged to join the Royal Guard.
Undyne strategizes a lot, thinking of her moves and occasionaly skipping them by accident. She tries to get Papyrus into the Royal Guard. She also uses daggers in combat.
Alphys is confident and outspoken. She hides her secrets better, but still deals with amalgamates. She made a deal with Mettaton, who wants to be incorporeal again.
Mettaton is a shy robot who wants to be incorporeal. He made a deal with Alphys that if they gain enough support, She will be able to separate him from his body (Separating a ghost from a body takes a lot of work). Mettaton even opens up a TV show just to gain more support.
(ART IS STILL IN PROGRESS.)
(I'M NOT GOOD WITH WIKIA CODING, SO COULD AN ADMIN DELETE THE ORIGINAL UNDERSWITCH PAGE OR MAKE IT REDIRECT HERE? THANKS!)