Commenting on events from left to right:



Papyrus must've tried to make a Sand Papyrus, but was unsuccessful, so he (reluctantly) followed Sans' example and made a lump with his name on it.

Toriel reminds me of my mother, always worrying about sun block on the babies.

Chara looks to be wanting to give Sans a bad time.

MK has wings?

Undyne is h4wt. (Alphys agrees.)