Real Name: Nightmare!Sans Alias: Nighty, Boss Personality: Cold, cruel, and calculating. Cherishes his subordinates to some extent but enjoys suffering. Appearance: Four black tentacles on his back, a black turtleneck under a black robe, one mint-colored eye, and black pants. Abilities: Attacks using tentacles, teleportation. Other: Owns Killer.

Gender: Male Age: Unknown (Adult) Personality: A prankster who frequently crosses the line, seeks 'new sensations' through murder, suffers from depression. Appearance: Blue hoodie, black turtleneck, white shorts. Black tar-like liquid flows from his eyes. A red target-shaped soul is always visible on his chest. Abilities: Sharp bone attacks, main weapon is a kitchen knife. Relationship: Owned by Nightmare. Status: The Bad Guys' assassin (Action Leader).

Real Name: Cross!Sans Gender: Male Age: Unknown (Adult) Personality: Always speaks politely, the kindest among the Bad Guys members, but the scariest when angry (rarely loses his temper). Abilities: Blasters, teleportation, main weapon is twin blades. Appearance: A white outer garment over a black sweater, white shorts for bottoms. Status: The Bad Guys' latecomer (Support).

Gender: Male Age: Unknown (Adult) Real Name: Dust!Sans Personality: Cold, calm, and taciturn. His emotions have dulled into a dry, hollow state. Appearance: Always wears a blue hood pulled down low. Usually has white pupils, but during combat, a glow of red (Determination) and purple (Perseverance) appears in his left eye. Wears a red scarf. Abilities: Bone attacks and massive, destructive Blasters. [Appearance is a large white dragon skull that fires powerful beams from its mouth], bones, teleportation. Status: The Bad Guys' cleanup specialist.

Gender: Male Real Name: Horror!Sans Age: Unknown (Adult) Personality: Appears laid-back yet cruel. Appearance: Tattered hoodie stained with blood, a large wound on the left side of his head (not life-threatening), wears sneakers, always carries a large axe. Status: The Bad Guys' tanker. Abilities: Large axe is his main weapon, possesses immense strength. Likes: Eating, food. Dislikes: Having his food taken away.