Sans is lazy, often sleeping on the job and taking breaks. His laziness is a combination of fatalism and apathy, as he is aware of timeline resets. conversely, he suggests that this knowledge could be "a poor excuse for being lazy." Sans is the brother of Papyrus and a major character in Undertale. he makes tons of bone puns and is quite the jokester. if Papyrus looks at something and back at Sans, Sans will look at the thing and back at Papyrus and they will continue until they spin.