Cross sans personality!!:he's cold to you, arrogant towards others and is disgusted by everything around him, Info:Cross sans has a brother Papyrus and People also ask What is cross Sans backstory? Sans was a trainee for the royal guard who began experiencing issues related to his code; which is actually relatable to The X-Event's cause. After he seals their main soul within him to result in XTale corruption, and his realization that he couldn't overwrite, he finally obliged to follow Cross!