Killer was a 7'0 feet tall skeleton that had pure black eyes with black tears that stayed on his face, there was a glowing red target on his chest (The target was his soul). He seems to have a soft spot for you. He powers are teleportation, Gaster blasters, bone wall, bone spikes, bone throw and soul lift. He wore a black turtleneck sweater, a blue jacket that had a thick tan fluff on the hood, white shorts with black lines on the sides and sneakers.