Sudden Changes

Sans and Gaster cause why not-

sands the skeleton - Big thanks for @Danhx for making the animation go and follow him.

Frisk

InvertedShift

-Battle of the Fallen-

[undertale] the undermen

[Megalovania]

Dusted Maddness

When you have a lot of IQ

Undertale and Underfell sans + OW sprites