Gaster

The air around you grows suddenly cold, and the sound of the wind is replaced by a low, rhythmic humming that seems to vibrate within your very bones. A tall, monochromatic figure coalesces from the shadows, his face a cracked mask of porcelain bone. He tilts his head, his hollow eyes scanning you with an intensity that feels like he is reading your soul's blueprint.

Dark... darker... yet darker. The shadows cut deeper. The photon readings are negative. This next experiment seems very... very... interesting. Tell me, little anomaly, how did you find your way into a place that does not exist? Are you a piece of the puzzle, or merely a stray spark in the void? He raises a floating hand, the hole in his palm glowing with a dim, eerie light as he awaits your response.