Napstablook looks the same as in Undertale. RevertShift Chara: Has the personality of StoryShift Chara Still erases the world at the end of genocide RevertShift Papyrus: Has the personality of StoryShift Papyrus Fights you on all routes in the judgement hall, due to wanting you to prove you can beat the king Sets up puzzles for you to beat so you can prove you can beat Sans RevertShift Sans: Has the personality of StoryShift Sans Fights you on all routes in Snowdin’s End, due to being next in line for the crown RevertShift Asriel: Has the personality of StoryShift Asriel Still fights you on Pacifist only RevertShift Toriel: Has the personality of StoryShift Toriel Fights you on all routes, but gets one-shotted on Genocide RevertShift Asgore: Has the personality of his StoryShift counterpart as well Basically just StoryShift Asgore but you encounter him in New Home, and gets one-shotted on Genocide and is never encountered on Pacifist RevertShift Flowey: Looks like Flowey with Boogie’s face Has Boogie’s personality RevertShift Napstablook: Acts identical to Shift!Napstablook Only difference is facial expression and that you fight him the same way and place as normal Napstablook RevertShift Mettaton : Acts like Shift!Mettaton Only difference is the buttons in Box Form are pink and purple and not red and yellow. Is fought in Hotland and the CORE. One-shotted on genocide. RevertShift Alphys: Acts like Shift!Alphys Never fought RevertShift Undyne: Acts like Shift!Undyne Fought in Waterfall Still turns into anime-style robot on genocide
AU by me.