Board Thread:General Discussion/@comment-29947165-20160911231001/@comment-29773467-20170129093500

Wildkitten1234 seems to be pretty correct with their knowledge of '''determination. '''Sans' origins are a complete mystery because of one underlying fact:

We don't know where Sans' story begins. Sans has omniperception, at least to some standpoint. He's well aware of timelines and how they work.

So the question here can't really be answered with any sort of accuracy. Honestly, I believe that W.D. Gaster created Sans, but for what purpose I do not know.