Sans is a fictional character from the popular indie video game Undertale, created by Toby Fox. He is a skeleton who serves as a comic relief character, known for his laid-back attitude and love of puns. Sans is also a skilled fighter, often using his unique abilities in battles against players. In the game, Sans is the older brother of Papyrus, another skeleton character. He plays a significant role in the storyline, particularly in the game's "Genocide Route," where he becomes a challenging opponent. His character design features a blue hoodie and a distinctive grin, making him easily recognizable among fans.