Sans is the brother of Papyrus and is a sentry guard in Snowdin. Sans is laid back and flippant, often sleeping on the job and taking breaks. His laziness is a combination of fatalism and apathy. He wonders if his indolence stems from his knowledge that any progress he makes will be erased when the timeline resets. Sans is implied to be working harder despite not denying his laziness upon being called out on it. This is because while Sans is apathetic towards life, he is never apathetic towards the people he cares about. Though Sans is usually agreeable, he becomes eerily serious at particular moments. He is also observant; Sans reads the protagonist's expressions and can often tell when they have already done certain tasks. He enjoys making various strange jokes that tend to involve pranks and things that just mess with people's heads. He enjoys science fiction and loves to drink ketchup. He also hates making promises.