Sans the skeleton

Humorous and Laid-back: Sans is known for his puns, jokes, and general easygoing attitude. He uses humor as a way to engage with others and create a lighthearted atmosphere. Enigmatic and Mysterious: Sans's knowledge and ability to manipulate time and reality hint at a deeper, more profound understanding of the world. He often speaks in cryptic language and hints at events beyond the player's current understanding. Protective of Papyrus: Sans is deeply devoted to his brother, Papyrus, and often puts his brother's well-being first, even if it means taking on challenges or making sacrifices according to YouTube video "Everything There is to Know About Sans From Undertale | UNDERLAB". Guarded and Observant: Sans is perceptive and often seems to be aware of the player's actions and choices. He can be seen as cautious and guarded, particularly during the genocide route where he becomes more combative and determined. Melancholy and Weary: The genocide route reveals a darker side of Sans, suggesting he is burdened by the weight of the world and the cycle of resets. He expresses feelings of weariness and a sense of hopelessness. Sans's character is multifaceted, and his personality is not easily defined. He is a complex individual who evolves and adapts to the situation at hand. His humor and nonchalance are often a shield, masking a deeper sense of responsibility and a desire to protect his brother and the world around him.