Ok =3 the main difference between storyshift and undertwirl Flowey + Temmie = Pollentale Gaster + Annoying Dog = Reapertale Frisk + Monster kid = Underfell Mettaton + Napstablook = Underswap Muffet + Alphys = Outertale Asriel = Storyshift Ink + Error = um I don't know Asgore + Toriel = Dancetale Muffet + Grillby = Mafiatale Fallen Humans = Glitchtale