Project "Gade"

Project "Gade" is the placeholder name for an AU that changes the story in a way that almost makes it function as a role switching AU. The history of Undertale undergoes some major changes.

Changes

 * Asriel was too afraid to take Chara's SOUL and it shattered in front of him. He's still alive, living with Asgore, and as he's still alive, Asgore is aging, making him want to retire and have Asriel take over as the Underground's king. Asriel still lives with the burden of not knowing what would've happened if he did take Chara's SOUL. Nothing good, bud.
 * Toriel is less stable than in Undertale, she feels her life just kinda sucks more I guess.
 * Alphys built a robot with a SOUL, and this gave Asgore the idea to have the Underground's military service run by these robots. Mettaton is the royal guard's captain guarding Hotland and the CORE, Napstablook oversees Waterfall, and the two somewhat less competent robots patrol Snowdin. Having been declared a hero for singlehandedly creating the new Royal Guard, Alphys has a bit more self-confidence than her Undertale counterpart.
 * Undyne tried to join the Royal Guard, but due to not being a robot, she couldn't, and fighting was really the only thing she was good at, so one thing lead to another and now she lives with two of her friends working at an illegal hotdog stand. She's still very adamant about wanting to wipe out humans, but in general she's somewhat less extreme than her Undertale self. She also doesn't know Alphys at all.
 * Sans and Papyrus are, obviously, who Undyne was living with. No one really knows how they met, though. Papyrus was inspired by Undyne's passion for joining the Royal Guard and aspired to join it himself with her, but was also rejected. Now he wears cardboard armor and declares himself one anyway. Sans is more or less the same, if anything a bit sloppier but a bit happier. He also fights you at the same time as Papyrus.