Sans (character)

Prior to the events of Undertale, Sans had moved to the settlement in Snowdin from an unknown location with his brother Papyrus. Papyrus was hired as a royal guard trainee sentry, and forces his brother to help in his quest to capture a human.[4]

Sans first appears in Snowdin, initially appearing as a silhouette approaching the player from behind before shaking the player's hand, setting off a whoopee cushion. He clarifies that he has no interest in capturing humans, unlike Papyrus, who he describes as a "human-hunting FANATIC." After helping the player hide from Papyrus, Sans follows his brother throughout most of the forest, commentating on his puzzles and even contributing a word search, much to Papyrus' dismay. As the story proceeds, Sans continues to be a regular source of comic relief, performing such antics as attempting to sell the player fried snow. Later in the game, Sans invites the player to go eat at a restaurant with him, if they so choose. As he talks, he explains how he befriended a woman behind the large door in Snowdin who shared an equal love for puns as he did. He explains how he made a promise not to kill any humans who come to the Underground and states if he didn't make that promise, the player would have been dead where they stand.

Sans makes one more appearance in the "Last Corridor," where he reveals the true meaning of the "EXP" and "LOVE" values that the player has accumulated through the game: 'Execution Points' and 'Level of Violence', respectively. He judges the player for how high their EXP and LOVE values are before disappearing and letting the player proceed to fight the king, Asgore. After the player defeats Asgore, and Flowey (if he hasn't been fought), they leave the Underground, Sans calls them to inform them of what occurred after their departure, having different dialogue depending on the player's actions in game. If the player finishes the game without killing any monsters, Sans appears after Asgore's defeat along with the other main characters, but his soul gets destroyed by Flowey, and the other six human SOULs disappeared. He is restored after the player loads their SAVE file.

If the player opts to kill every monster in each area, Sans' behavior will be very different. He threatens the player with a "bad time" if they proceed with their actions before the Papyrus' boss fight. If the player ignores Sans' warning and continues slaughtering every monster they need, he eventually confronts the player in the Last Corridor to prevent them from destroying the world, acting as the route's final boss. Sans is revealed to have supernatural abilities and is extremely powerful, but eventually is killed by the player. [5]

Sans appears as a cameo in chapter one of Deltarune, where he is found standing outside his shop, a remodeled version of Grillby's from Undertale. He informs the player he has already met their mother, Toriel, and asks them if they would like to come over to his house and meet his brother.

In Super Smash Bros. Ultimate, a Sans costume for the playable Mii Gunner character was released as downloadable content on September 4, 2019.[6] Sans has also been the subject of many fan works and projects, being featured in numerous games, creations, and video game mods.[7][8][9][10]