anti-god sans is the chaotic evil of the entire omniverse. he is incapable of dying, as he can always resurrect himself no matter what. everyone knows that he will eventually destroy the entirety of existence, including himself. he is the bringer of hopelessness, having no empathy for what he destroys. he rarely ever talks, mostly just going into the kill as soon as something alive comes into view. he doesn't have a reason for any of this, it's just his nature to be a chaotic evil entity