Error!Sans is an AU destroyer created by Tumblr user, Lover of Piggies. In this AU, he is bent on destroying all AU's and things he considers 'glitches' or 'mistakes' in the multiverse. He uses blue strings to tie up and shatter souls, and if the strings go inside a victim, he will be able to transfer his soul into the victim, controlling them to do whatever he likes and leaving the victim helpless. He can jump from one universe to another, as well as having several other glitch powers/quirks. Error Sans basically is an AU hunter, seeking and destroying AU's left and right, except for the ones he likes such as Outertale and Undernovela. How he does it, is he keeps Frisk and Flowey under guard so they are unable to reset (he basically imprisons them), then proceeds to go on a killing spree. Error Sans was created as a result of a player messing with the game files too much, resulting in him glitching out. He found himself trapped in the white void between game files (which CORE Frisk cannot see). He went insane in there, until he found out how to manipulate the game's code to open portals to various AUs.

But when it comes to this game, he knows it's not suppose to exist, it being in "HD" and all, so he tries to fix it by destroying it.

I want ERROR!Sans to sound like Audiospawn's performance of him, here's an example: https://www.youtube.com/watch?v=NI5_VpjYwDY