if i tried this i would die in 2 seconds :D

DIFFERENCES:
Neutral - Assuming you have killed Papyrus, you'll encounter Sans in the rain-room/the room before the castle view. Your KR damage will be incredibly lessened.

Pacifist: Asgore will fight you, and Asriel will be using his Hyperdeath Form/Timeline Breaker phase for the entirety of the fight.

Geno: Papyrus will be in the Royal Guard, leading to a fake-out where you still hit him but the only thing that falls off is his helmet-- as a fight would then begin. Undyne would have higher/artifical(?)
Determination. Sans's fight would be much more difficult.

My World My World My World My World My World
The SOULs would never heal you, and you'd have to do 2 SOULs at a time to progress in the fight.

i agree

sans fr lookin rumpelstiltskin from shrek ngl