Killer Sans

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Bad Sanses / Nightmare's crew

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DUST

Dust Sans (also known as Murder!Sans) from the Undertale AU Dusttale is defined by a tattered blue hoodie, severe psychological trauma, and a desperate mission to gain enough execution points to stop the human's genocide loop.

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Appearance

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Wears a blue hoodie with a grey hood pulled up to keep dust out of his face.

Outift includes a white sweater with a raised color, black pants with white lining, and white sneakers.

Left eye glows cyan encircled by red, and his right eye glows solid red (representing lost justice and gained determination), though they occasionally revert to empty sockets.

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Lore

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After retaining memories of endless reset timelines caused by the human, Sans concludes that standard methods will always fail.

He decides he must harvest his own monsters' LOVE (Level of Violence) to become strong enough to overpower the human.

He tragically starts by killing his own brother, Papyrus, alongside every other monster in the Underground, before facing the human in the judgment hall.

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Personality

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Transformed from a lazy, easygoing comedian into a psychotic, numb, and desperate killer. Suffers from severe mental degradation and schizophrenia, dealing with constant auditory and visual hallucinations of his deceased brother Papyrus who eggs him on.

Oscillates between cold detachment, maniacal determination to end the resets, and deep depressive episodes where he realizes the absolute futility of his actions.

Can speak Korean

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NIGHTMARE

Nightmare Sans is a corrupted, tentacled entity from the Undertale AU [Dreamtale] who serves as the guardian of negative feelings. His character is defined by a tragic transformation from a gentle protector into a sadistic mastermind.

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Appearance

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Original Form: Before corruption, he had white bones, lavender pupils, a dark purple long-sleeved jacket with a gold "NM" belt, black pants, dark purple boots, and a golden crescent moon headpiece.

Corrupted Form: He is entirely covered in a black, inky, and acidic goo-like substance that drips constantly.

Distinguishing Features: He possesses several writhing, shadowy black tentacles on his back that act as extra limbs and weapons, and his single visible eye usually glows a bright, menacing light blue or purple/magenta.

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Lore

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Origin: Created alongside his twin brother Dream by the spirit of the Tree of Feelings to guard the negative side of the magical tree.

The Breaking Point: While Dream was loved by nearby villagers, Nightmare was relentlessly bullied, beaten, and blamed for all local misfortunes.

The Corruption: Driven to desperation, Nightmare consumed a black, negative-corrupted apple from the tree, which shattered his mind and melted his body into an inky monster that consumed his original self and destroyed his village.

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Personality

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Past: Originally kind, empathetic, charitable, and deeply protective of his brother and all living things.

Present: Cold, sadistic, highly manipulative, and merciless. He feeds on the emotional suffering of others, takes pleasure in mental and physical torture, and leads a group of villainous minions to spread despair across alternate universes

Can speak Spanish

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KILLER

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Appearance

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Classic Silhouette: Retains the fundamental build of traditional Sans.

Eye Sockets: Constantly leaks a thick, black liquid substance, which represents liquefied determination from his countless massacres.

Clothing Tweaks: His iconic blue jacket features a much wilder, fluffier hood, and his shorts have inverted color patterns (white with black stripes instead of black with white stripes).

The Soul: His soul manifests outside his body as a bright red target or bullseye symbol, shifting shapes depending on his current state.

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Lore

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The Endless Resets: Born from a timeline where Chara repeatedly dragged him through hundreds of genocidal routes.

The Turning Point: Driven by a desire "to feel something new" or manipulated/hacked by the game code itself, Sans eventually teams up with Chara and participates in the slaughter of his own underground, including his brother Papyrus.

Joining Nightmare: After turning on Chara and fracturing his own universe, he escapes or is recruited into Nightmare Sans’s group of villainous alternate-universe Sanses, serving as a powerful, traumatized enforcer.

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Personality

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Theatrical & Numb: On the surface, he acts playful, chaotic, sarcastic, and dramatic—turning violence into a dark performance to mask his internal emptiness.

Emotional Instability: He is largely emotionally numb, but prone to sudden mental breakdowns, panic, and identity confusion whenever genuine feelings or memories try to break through.

Unpredictable: He fluctuates rapidly between a cold, detached killer and moments where his original, weary self tries to surface (often symbolized by his right eye briefly clearing).

Can speak Arabic

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HORROR

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Appearance

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Head Injury: He features a massive, noticeable hole and crack on the left side of his skull, inflicted by Undyne.

Clothing: He wears a tattered, furry blue-grey hoodie and a white shirt stained with dried blood, paired with sneakers instead of slippers.

Eyes: His eye sockets are mostly black, illuminated by a constant, glowing blood-red light or pupil in his left eye.

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Lore

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The Downfall: Stemming from a broken neutral route in the Underground, the barrier remained closed, food ran out, and the kingdom fell into absolute starvation.

The Incident: Undyne went rogue and attacked Sans, cracking his skull and destroying part of his magic.

Survival Compromise: To keep his brother Papyrus and the starving Snowdin residents from completely losing their minds or dying, Sans reluctantly helped source food, though he personally tried to resist eating human meat for seven years.

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Personality

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Psychosis & Mood Swings: Years of trauma, starvation, and head injury left him with severe psychological damage, erratic mood swings, and profound boredom.

Dark Humor: He displays a taste for black, psychological humor and enjoys the terror of the fallen human child, Aliza, though deep down traces of his old self and a protective streak for his brother remain.

As noted in a community consensus on Reddit, most fans find that his "hypocritical yet loving actions of feeding Papyrus and other monsters human meat for survival while trying to abstain himself" make him a uniquely compelling and tragic anti-hero.

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CROSS

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Appearance

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Clothing: Wears a black-and-white hooded jacket with fluffy white trim, black shorts without stripes, and white/black athletic shoes or slippers.

Facial Features: Features a red, lightning bolt-shaped scar under his right eye socket.Eyes: Possesses one normal white pupil and one red/purple-ish target-like or red-slit pupil linked to his shared soul state.

Accessories: Often wears a heart-shaped locket and utilizes giant monochrome or hack-knife weapons.

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Lore

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Origin: Originally a royal guard trainee in X-Tale, his world suffered under the manipulative "X-Event" experiments of XGaster and XFrisk.

The Split/Sharing: After Chara merged into his soul and his universe became corrupted with no resets left, he became desperate to restore his home.

Underverse Events: He allied with Nightmare to steal code fragments from other alternate universes (AUs) to rebuild his world, acting as an antagonist before later shifting back to a complex, aligned role with the XTale crew.

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Lore

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Star Sanses / Dream's crew

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INK

Ink is a wildly creative, energetic, and prone to pranks, but he is fundamentally soulless and relies on his paint vials for artificial emotions.

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Appearance

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• Eyes: His pupils change shape and color depending on his current emotions (such as a blue circle and a yellow star).

• Clothing: Wears a light shirt/white undershirt with a small brown jacket, overalls tucked in as pants, fingerless gloves, and a massive brown scarf used to jot down notes.

• Accessories: A chest-crossing work belt holding rainbow-colored, heart-topped paint vials.

• Weapons & Traits: Carries a giant paintbrush called "Broomie" on his back and has a black ink blot smeared on his right cheek. He is barefoot or wears simple sports shoes/leggings depending on the design ref.

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Personality

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• Passionate & Creative: Deeply loves art, creation, and motivating others, though he can get overwhelmingly excited (sometimes vomiting black ink when too emotional).

• Soulless & Detached: Because he lacks a real soul, he cannot genuinely feel or care for others unless he drinks from his emotional paint vials. Without them, he can become cold or chaotic neutral at best.

• Forgetful & Quirky: He has terrible short-term memory, often trailing off mid-sentence or writing reminders directly onto his scarf.

• Mischievous: He enjoys playing light pranks, teasing others, and acting a bit childish or unpredictable.

Ink can speak French

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BLUE / SWAP

• Wears a grey or dark-blue tactical battle-body armor instead of a casual hoodie.

• Sports a large, bright light-blue bandana or makeshift cape around his neck. Has light-blue, expressive eye-lights or hollow blue circles in his sockets rather than plain white or flashing glowing eyes.

• Wears matching blue boots instead of casual slippers.

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Personality

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• Hyperactive and upbeat: Extremely energetic, loud, and ambitious instead of lazy.

• Royal Guard Aspirant: Trains hard under Alphys because he desperately wants to join the royal guard.

• The "Magnificent" title: Refers to himself proudly as the "Magnificent Sans".

• Food preference: Loves making and eating Mexican food like tacos and burritos instead of enjoying hot dogs and ketchup.

• Puzzles and riddles: Loves setting up complex riddles and puns for others.

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DREAM

• He is shorter and smaller in build than the original Undertale Sans.

• Headwear: He wears a small, regal golden circlet or crown resting on his skull.

• Clothing: Traditionally, he wears a light-blue or turquoise jacket with darker pants, a golden belt cinched around his waist featuring the initials "DS" (Dream Sans), and matching boots.

• Cape: He sports a flowing golden-yellow cape or scarf tied with a star-shaped badge.

• Weapons: He carries a golden pole/staff with star designs on the ends that can transform into a bow for shooting arrows of positive energy.

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Personality

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• Optimistic & Cheerful: He is bright, happy-go-lucky, and hyper, dedicated to spreading joy and cheering others up.

• Talkative: He tends to be over-dramatic, chatty, and very expressive.

• Compassionate: Driven by positive energy, he deeply cares for the well-being of all living things across different universes.

• Determined/Serious: While mostly gentle, he can become stern, serious, and fierce when fighting against his twin brother, Nightmare, or dealing with threats to multiversal balance.

Dream can speak Spanish

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OTHER

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ERROR

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Appearance

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Bones & Markings: Pitch-black skeletal frame covered in shifting, colorful error message text and visual glitches.

Clothing: A dark black jacket with a blue hood, a bright red shirt, black shorts with blue stripes, and red-to-black gradient slippers.

Eyes: One white pupil and one yellow-and-blue concentric ringed pupil; blue strings or "tears" often leak from his eye sockets.

Hands: Finger-less black gloves with distinct red or yellow-colored fingertips.

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Lore

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Origin: He originated as Geno!Sans from Aftertale who abused determination magic and accidentally trapped himself inside the empty Anti-Void.

Insanity: The endless, isolated torment of the void caused him to lose his mind, fracturing his code and erasing most of his original memories.

Mission: He views all alternate universes (AUs) as illegal "glitches" and abominations, appointing himself the destructive custodian of the multiverse.

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Personality

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Hateful & Unstable: Deeply insane, erratic, and aggressive toward anyone he deems an anomaly.

Haphephobia: Exhibits an extreme phobia of being touched by others.

Hypocritical/Vindictive: Hates anomalies while ironically being a glitch himself; enjoys quiet pastimes like crocheting and keeping captured alternate variants as "puppets".

He has a Russian accent