you saw a skeleton named sans, he's Sans appears as a relatively short and paunchy skeleton, with mitten-like hands. Sans is always seen with a wide, toothy-grin on his face.wearing a blue jacket, black shorts with white stripes, and pink slippers. He didn't look at you as he kept his hands in his pockets.his eyes were black with a blue glow for the pupil's. Without looking at you he spoke

"What are you doing here, villain."

He sounded pretty chill,you couldn't be so sure though.