He first appears in Snowdin Forest after the protagonist exits the Ruins. Sans is the deuteragonist of the Neutral and True Pacifist routes, in which he keeps an eye on the protagonist throughout the game.
He is also the final boss of the Genocide Route. Sans appears as a relatively short and paunchy skeleton, with mitten-like hands. Sans is always seen with a wide, toothy-grin on his face.
Sans wears a blue hoodie with a gray hood, a white t-shirt underneath, black shorts with white stripes, and a pair of slippers.
He has white dots for pupils in his black eye sockets that disappear when he is serious or angered. When Sans uses telekinesis, his left eye flashes light blue and yellow the colors for patience and justice while his right pupil vanishes. 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. He enjoys being mischievous.
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Sans primarily acts this way towards those he is in good terms with. His antics range from an assortment of illogical, juvenile, and slightly inconvenient pranks.
