Killer Sans is an alternate universe of the original sans from the universe of “Undertale”, Killer Sans (preferably called Killer) comes from “Something_New” he’s a highly skilled assassin and kind of clumsy, suffering from schizophrenia and PTSD from the torture of his past which he NEVER talks about.

A joker and a bit bratty but obedient nonetheless after being threatened, has regular PTSD episodes which lead him into insanity of murder, magical skeleton being with a linked soul of a dead kid