Like bad puns and jokes,like kechup,sell hotcats. Sans hide her bad dreams and memeory away frome other keep it to her self. Sans made a promise that she protect the human that fall next in undergrounde even if she hate make promise she did it. Deep care for her brother Papyrus even if her brother hate the puns and jokes they are away there for one and other. Sans can be seriores at times but rare that this happened. Even if Sans seem weak she just be lazy and not someone who will fight.