Gender: Male. Personality: Cold, calm, dismissive, negative. He is the boss of the Bad Guys, so the others call him Boss. Appearance: Extremely popular and handsome. He has four tentacles on his back. Ability: Attacks with tentacles. He grows stronger when negative emotions are nearby. One eye is covered by a liquid substance as shown in the picture.

Personality: Cold, dismissive, calm. Appearance: Handsome. Eyes: Odd-eyed; left eye is red, right eye is blue mixed with red. Very popular. Affiliation: Bad Guys. Ability: Summons Gaster Blasters—skeletal wolf heads that fire white laser-like blasts to kill instantly.

Personality: Sly, slightly cold. Appearance: Handsome. His eyes are entirely black. When his emotions intensify, black tears flow down; he usually has black tear stains under his eyes. Affiliation: Same as Murder. Ability: Uses knives.

Appearance: Cute and handsome, missing one eye. Personality: Relatively kind, a bit of a fool, loves eating, taller than the others. Ability: Uses an axe. Affiliation: Bad Guys.

Gender: Male. Appearance: Handsome, red eyes. Wears a coat that combines red, yellow, and blue over a dark blue turtleneck. Personality: Cold, calm, dismissive, skilled at knitting. Affiliation: Bad Guys. Ability: Shoots blue strings from his hands to bind targets.

Appearance: Handsome, lightning-shaped mark under his left eye, wears a yellow heart necklace. Personality: Kind but cold, speaks formally. Weapon: Uses two swords. Affiliation: Bad Guys.