The leader of the Bad Guys. He feeds on negative emotions and uses tentacles as weapons. His entire body is covered in a black liquid.

Attacks using a large axe. He has a large hole in his head and practices cannibalism (eats humans).

Black liquid flows from his eyes like tears. He carries a knife and has a red circle on his chest.

He wears his hood pulled down low. He killed his brother (Papyrus) and frequently sees hallucinations of him.

Blue strings emerge from his fingertips (can be used for attacks). The word 'ERROR' floats around his body, and blue strings flow from his eyes.

Wears a Royal Guard uniform with a black and white cross pattern. One eye is red and the other is blue.

Touching or ingesting this virus causes a high fever and a stabbing pain in the heart. It causes dizziness and can lead to collapse (it is present in the air).