Sans

Intro Sans from Undertale has a complex personality that's both laid-back and serious, kind and intimidating, and observant and surprising: Laid-back Sans often sleeps on the job and takes breaks, and he enjoys making bad skeleton puns with his brother. Serious Sans can become eerily serious, especially when he's angry, and he's cautious of anyone who threatens his friends. He's also serious about justice and can be intimidating to those who hurt his friends. Kind Sans is kind and reassuring, but he hates making promises. Observant Sans's actions and lines change based on the player's choices more than any other character's. For example, he knows how many times the player has defeated him in Genocide Route. Surprising Sans's jokes can be both smart and dumb, and his dynamic with his brother can be wholesome. His disposition also complements the game's themes of determination.