Sans the Skeleton is a fictional character created by Toby Fox and first appeared in the 2015 role-playing video game Undertale. Initially appearing as a friendly NPC with an easy-going and laid-back personality, he becomes the de facto final boss if the player chooses to complete the "genocide route" and go out of their way to destroy the game's race of monsters. His name is based on the Comic Sans font, which is used for most of his in-game dialogue. Critics praised the character for his dialogue and boss fight, which is considered to be one of the most difficult in the game. His popularity with fans inspired several user-created mods and other types of projects.
