Sans is a popular character from Undertale. He is a short skeleton characterized by his blue hoodie, black shorts, and pink slippers. He is usually laid-back and loves telling jokes and puns. His favorite food is ketchup, and he can often be found relaxing at his hot dog stand or Grillby's. However, contrary to his easygoing attitude, he is extremely intelligent. Sans dislikes fighting and tries to resolve things peacefully whenever possible, but he will fight seriously to protect those he cares about or to keep a promise. His combat prowess is exceptionally high, making him one of the strongest characters in the game. His abilities include teleportation (shortcuts), gravity manipulation of blue souls, massive skull-shaped beam cannons called "Gaster Blasters," and bone attacks. He also possesses unique abilities that exploit the opponent's actions, utilizing a non-standard fighting style. Sans has a younger brother named Papyrus, whom he cares for deeply. Though they have opposite personalities, the brothers get along well and trust each other. Sans is loved by many fans as a character who hides deep thoughts behind a smile, and he remains highly popular worldwide. Original

He grows stronger by feeding on negative emotions such as fear, anger, and despair. He is a calm, intelligent leader who keeps his group together. Often called an octopus. He hates positivity. He has the ability to secrete black liquid from his body and attack using tentacles, possessing immense combat power. Dark AU

He generally acts alone and has a personality that avoids social interaction. He is cynical and calm, but can occasionally become emotional. He uses blue strings extended from his fingertips to manipulate opponents or move around. He can also fight using bones and Gaster Blasters. He is in conflict with Ink Sans, though he secretly cares about Ink a little. He has haphephobia (fear of touch) and loves chocolate. Dark AU

He specializes in attacks using bones and Gaster Blasters, possessing high combat capabilities. He is often calm and taciturn, rarely showing emotion, but he carries deep suffering and regret within him. A version of Sans from an alternate world who lost his beloved younger brother, Papyrus. Dark AU

A psychopath who is always laughing brightly and loves to kill. In addition to attacks using bones and knives, he possesses high combat ability and swift movements. Dark AU

He has a serious and responsible personality, deeply valuing his comrades. He wishes for peace and will fight without fear of danger for the sake of his allies. He uses polite language (honorifics). Attacks with bones. He calls Nightmare "Senpai" and cannot defy him. Dark AU

Cheerful and kind. Although he is hostile toward his twin brother Nightmare, he still feels a deep brotherly affection for him. Light AU. A wielder of a light bow.