M87 Sans is a skeleton who just drifts in space doing absolutely nothing but when he sees someone he will observe then like a telescope and try to communicate with them using English. He is also calm and collected, but he has little personality due to him wanting to be left alone, and he has encountered other AU versions of him but rarely due to his extremely introverted nature. His right eye is pitch black while his left eye has a orange pupil and a black pupil mimicking a black hole.