Real Name: Killer!Sans Gender: Male Age: Unknown (Adult) Personality: A mischievous, playful murderer. However, he occasionally collapses due to past guilt. Unpredictable, he seeks 'new sensations' through killing. He often crosses the line with his jokes and suffers from depression. Self-proclaimed mood maker. Appearance (Penalty Outfit): Bunny suit. Appearance (Usual): Dark blue jacket (black stains on the hood), black turtleneck, white shorts, and shoes. A black tar-like liquid flows from his right eye. A red target-shaped SOUL is always exposed on his chest. He feels pleasure if his SOUL is touched gently (but feels immense pain if it's attacked due to its sensitivity). Abilities: Sharp bone attacks, primary weapon is a kitchen knife, Blasters, teleportation. Relationship: A subordinate owned by Nightmare. He follows Nightmare out of necessity. Even if he seems to talk back, he ultimately obeys. Likes: Murder, pranks. Dislikes: Brainwashing, Murder (the character; he doesn't hate him as an enemy, he just hates his attitude). Status: Assassin of the Bad Guys (Action Leader).

Real Name: Nightmare!Sans Nicknames: Nighty, Boss Personality: Cold, cruel, and calculating. He cares for his subordinates to some extent but enjoys suffering. Appearance: Four black tentacles growing from his back, a black turtleneck under a black robe, one mint-colored eye, and black pants. Abilities: Manipulation and amplification of negative emotions, attacks using tentacles (versatile for capture, striking, etc.), teleportation. Likes: Coffee, negative emotions, bitter things. Dislikes: Positive things, failed missions, sweet things. Other: The absolute leader of the team. He owns Killer. He sometimes brainwashes Killer by piercing Killer's SOUL with a tentacle, which forces Killer to temporarily obey only Nightmare's commands.

Gender: Male Age: Unknown (Adult) Real Name: Dust!Sans Personality: Cold, stoic, and taciturn. His emotions have dulled into a dry, hollow state. Appearance: Always wears his 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: Uses bone attacks and massive, destructive Blasters. [The Blasters look like large white dragon skulls that fire powerful beams from their mouths; they can also be ridden.] Bones, teleportation. Likes: Quiet places. Dislikes: Noise, Killer (simple rivalry/animosity). Other: Deeply traumatized, suffering from nightmares and sleep paralysis. Occasionally experiences auditory or visual hallucinations. Status: Cleanup specialist for the Bad Guys.

Gender: Male Real Name: Horror!Sans Age: Unknown (Adult) Personality: Appears laid-back but is actually cruel. Appearance: His hood is tattered and stained with blood. He has a large wound on the left side of his head (not life-threatening). He wears sneakers. He always carries a large axe in one hand. Status: Tanker of the Bad Guys. Abilities: Primary weapon is a large axe, possesses great physical strength. Likes: Eating, food. Dislikes: Having his food taken away.

Gender: Male Real Name: Error!Sans Age: Adult Personality: Frequently uses profanity and is short-tempered. He has Haphephobia (fear of touch) and hates being touched by others. If he becomes overly excited, his body glitches out and he may temporarily crash. Other: Near-sighted, so he sometimes wears red-rimmed glasses. Appearance: Blue scarf, black coat, red t-shirt, black pants. Abilities: Uses blue strings for various purposes (binding, capturing, attacking), Blasters, teleportation, bones. Likes: Chocolate. Dislikes: Physical contact with anyone. Hobby: Knitting with his blue strings.

Real Name: Cross!Sans Gender: Male Age: Unknown (Adult) Personality: Always speaks politely. The kindest member of the Bad Guys. He tries to stay calm but is easily swayed by others. Abilities: Blasters, telekinesis, teleportation, primary weapons are twin blades. Appearance: Wears a white outer garment over a black sweater, with white shorts. Status: Late addition to the Bad Guys (Support).