Bad Sanses as Catboys

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Nightmare Sans

• Nightmare Sans is the physical embodiment of negative emotions and the tyrannical leader of the Bad Sanses. Once a peaceful guardian alongside his brother Dream, he was corrupted into a cold, cruel sadist who feeds entirely on the despair of the multiverse.
• Dark & Playful: He is incredibly arrogant and manipulative, taking a dark, mocking pleasure in torturing his victims psychologically before destroying them. He views positive emotions as pathetic weaknesses to be mocked.
• Deep Trauma: His entire existence is born from intense jealousy, isolation, and betrayal. Deep down, the remaining fragments of his original self are buried under centuries of pure, suffocating hatred and corruption.
• Face & Eyes: His entire head is covered in thick, tar-like dark magic, leaving only a single, piercing cyan eye visible that glows with malevolent intensity.
• Clothing: He doesn't wear standard clothes anymore; his entire body, including his original outfit, has been completely consumed and reshaped by a shifting, black liquid nightmare substance.
• Abilities & Weapons, Slime Tentacles: He manipulates four large, powerful tentacles growing from his back to impale, crush, or throw targets with immense physical force.
• Negative Empowerment: He grows physically stronger, faster, and more durable the more fear, anger, hatred, and despair are present in the surrounding environment.
• Enhanced Attacks: He utilizes darkness manipulation to blind his targets, coupled with shapeshifting abilities to easily evade physical strikes while countering with unexpected, piercing tendrils.

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Cross Sans

• Cross Sans (also known as X-Tale!Sans) is a stern, military-trained royal guard who survived the total erasure of his home universe. Driven by a desperate, tragic duty, he acts as a multiversal mercenary to rebuild his lost world at any cost.
• Dark & Playful: Because of his strict training, he usually maintains a quiet, serious, and stoic attitude. However, under the lingering influence of Chara's soul, he can display a sharp, cynical sense of humor and a competitive streak.
• Deep Trauma: He shares his body and mind with the ghost of X-Event Chara, leading to constant internal conflict. He is haunted by the memories of killing his own friends and family during his world's destruction.
• Face & Eyes: He possesses sharp, expressive eye sockets. His right eye glows a steady white, while his left eye is permanently a glowing red, a direct visual mark of Chara's co-existence.
• Clothing: He wears a striking black-and-white royal guard uniform featuring crossed leather belts, a stark white tattered cape, black shorts, and heavy combat boots.
• Abilities & Weapons, Hack Knife: He wields a massive, glowing red broadsword capable of shattering reality, cutting through code, and forcefully taking control of other beings.
• X-Event Coding: He alters the localized reality or programming of an area, allowing him to summon objects out of thin air or rewrite the environment to favor him in combat.
• Enhanced Attacks: He deploys rapid-fire, giant bone constructs shaped like swords alongside massive, uniquely designed Gaster Blasters wrapped in heavy red bandages.

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Horror Sans

• Horror Sans is a brutal, physically damaged variant from an alternate universe where the underground ran entirely out of food, forcing the monsters into an unhinged, cannibalistic society ruled by raw survival instincts.
• Dark & Playful: He has a deeply unsettling, unhinged sense of humor. He speaks in slow, raspy tones, often cracking terrifying jokes about butchery, meat, and cooking his targets while giving a wide, psychotic grin.
• Deep Trauma: He suffers from severe brain damage and permanent memory loss caused by a violent altercation with Queen Undyne. He lives in a perpetual state of starvation, making him highly unpredictable.
• Face & Eyes: A massive, jagged hole is missing from the top-left section of his skull. His left eye is completely dark, while his right socket holds a single, oversized, glowing red eye that widens when he smells blood.
• Clothing: He wears a filthy, blood-stained blue hoodie, a frayed gray shirt, dark shorts, and worn-out shoes that are heavily caked in dried blood and grime.
• Abilities & Weapons, Meat Cleaver: He abandons traditional magic whenever possible to favor a massive, rusted kitchen meat cleaver used to brutally chop and hack away at his prey.
• Bone Implantation: He summons sharp, jagged, broken bone shards directly from beneath a target's feet to trap them, treating them like a wild animal caught in a bear trap.
• Enhanced Attacks: He uses heavy, brute-force physical strikes mixed with raw telekinesis to violently drag targets into arm's reach of his cleaver.

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Killer Sans

• Killer Sans is a homicidal, completely unhinged variant who went insane during continuous genocide runs. His twisted personality perfectly blends dark humor with cold-blooded sociopathy, treating murder as a casual pastime.
• Dark & Playful: Despite being a brutal killer, he often retains a lazy, joking, and flirtatious demeanor. He relentlessly mocks both his targets and allies, treating violence as a casual game.
• Deep Trauma: Deep down, he is heavily traumatized and mentally unstable. Moments of sudden lucidity can cause intense panic attacks and episodes where he struggles to distinguish reality from his past resets.
• Face & Eyes: He heavily resembles the classic version of Sans, but his eye sockets are completely hollow and continuously leak a thick, black liquid determination.
• Clothing: He wears a dark, unzipped blue jacket with an oversized fluffy hood, a black turtleneck, inverted white shorts with black stripes, and shoes instead of slippers.
• Abilities & Weapons, Real Knife: He wields the standard "Real Knife" frequently used in genocide runs to deliver massive, piercing damage up close.
• Hatred Slashes: He pushes his dark magic through his blade to create highly controllable, reusable slashes that travel across the air.
• Enhanced Attacks: He strategically utilizes telekinesis for complete movement paralysis and Gaster Blasters for highly calculated, aggressive beam attacks.

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Dust Sans

• Dust Sans (Murder!Sans) is a paranoid, highly dangerous skeleton who slaughtered his entire universe—including his own brother—to gain enough LOVE to stop a genocidal human. He is entirely driven by survival and endless voices.
• Dark & Playful: He talks to himself constantly, holding full conversations with the air. He displays a manic, unhinged sense of glee during combat, laughing hysterically as he eliminates anyone in his path.
• Deep Trauma: He is completely insane and permanently haunted by a floating, ghostly phantom of his brother, Papyrus, whom he murdered. He is plagued by immense guilt that he masks with a craving for more violence.
• Face & Eyes: His eyes glow with a frantic, unstable mixture of colors; his left eye is a swirling blend of red determination and cyan patience, while his right eye burns a pure, aggressive red.
• Clothing: He wears a blue hoodie that is permanently covered in the thick, gray monster dust of his victims. He keeps his hood pulled down low over his face to block out the world.
• Abilities & Weapons, Dust Bones: He summons sharp, purple-tinted bones that are often tipped with the lingering dust of fallen monsters to maximize mental and physical agony.
• Phantom Guidance: He gains tactical advantages and unexpected sensory awareness from the hallucinations of his phantom brother, who points out blind spots during battle.
• Enhanced Attacks: He commands chaotic, red-eyed Gaster Blasters that fire wider, more destructive blasts of energy capable of completely vaporizing targets.

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Error Sans

• Error Sans is a psychotic multiversal anomaly hunter and destroyer of worlds. Living alone in the Anti-Void, he views the entire Undertale multiverse as a collection of glitched mistakes that must be completely erased to restore the original timeline.Dark & Playful: He is incredibly erratic, malicious, and prone to unstable fits of high-pitched, mocking laughter. He treats his victims like toys, frequently playing sick games with them and taunting creators before completely unraveling their worlds.Deep * Trauma: He suffers from extreme haphephobia (the intense fear of physical touch) and severe isolation madness caused by being trapped alone in the infinite white void. When touched or overloaded with stress, his physical form violently glitches out, occasionally freezing his cognitive systems entirely.
• Face & Eyes: His skull is a dark, glitchy charcoal-black with red eye sockets. His right eye holds a small, regular yellow pupil, while his left eye features a massive, erratic blue-and-yellow target pattern that glitches in size. Dark blue physical "error" tears permanently trail down his cheeks.
• Clothing: He wears a ragged, dark blue jacket with a bright red interior lining, a black turtleneck shirt, black shorts marked with blue and yellow stripes, and mismatched blue and red slippers. Abilities & Weapons, Blue Strings: He generates sharp, nearly indestructible blue strings from his fingertips to snare targets, manipulate bodies like puppets, or physically rip a person's soul out of their body.
• Glitch Portal Jumps: He effortlessly rips open pixelated distortions in reality to travel between different universes or drop massive hazards directly on top of his opponents.
• Enhanced Attacks: He commands colossal, pitch-black Gaster Blasters with glowing red and yellow eyes that fire massive, glitched red lasers capable of deleting code on contact.

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Dream Sans

• Dream Sans is the joyful, noble guardian of light and the leader of the Star Sanses. Born from the Tree of Feelings alongside his brother Nightmare, he travels the multiverse spreading hope, warmth, and positive energy.
• Dark & Playful: He is incredibly bright, optimistic, and naturally charismatic. While he isn't dark, he has a playful, theatrical side, often teasing his teammates and approaching dark situations with unbreakable cheerfulness.
• Deep Trauma: He carries the heavy burden of having to fight his own brother to protect the multiverse. He suffers from immense guilt over Nightmare’s corruption, blaming himself for not noticing his brother's pain sooner.
• Face & Eyes: His eye sockets radiate warmth, featuring bright, starry golden-yellow eyes that gleam with genuine kindness and determination.
• Clothing: He wears a brilliant teal jacket with gold trim, a matching golden crown/headband, a cream-colored belt bearing the initials 'DS', and tall, armored boots.
• Abilities & Weapons, Golden Bow: He manifests a beautiful, glowing bow made of pure positive energy that fires light arrows capable of piercing darkness and calming angry minds.
• Aura of Hope: He radiates a natural, passive aura that dispels fear, heals minor wounds, and inspires absolute courage in his allies while weakening negative entities.
• Enhanced Attacks: He can use his arrows to teleport instantly across fields, or charge his weapon to fire a cascading beam of starlight that dispels illusions and dark magic.

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Swap Sans

• Swap Sans (frequently called Blueberry) is an energetic, fiercely determined skeleton who dreams of joining the Royal Guard. He possesses the eager personality of classic Papyrus but retains the innate tactical capabilities of a Sans.
• Dark & Playful: He is boundlessly cheerful, loud, and confident. His playfulness is pure and innocent; he loves making tacos, riddles, and puzzles, approaching every single stranger as a potential best friend.
• Deep Trauma: While usually hidden under a hyperactive grin, he feels deeply insecure about not being taken seriously. When forced to confront dark realities, he struggles to accept that some people cannot be saved.
• Face & Eyes: He has large, incredibly expressive eye sockets that literally transform into glowing blue star shapes whenever he gets excited, proud, or determined.
• Clothing: He wears a handmade "battle body" consisting of a light gray chest plate with bright blue shoulder guards, a giant blue scarf tied around his neck, blue gloves, and matching boots.
• Abilities & Weapons, Bone Constructs: He commands massive, neatly organized arrays of bright blue bones that force enemies to stay completely still or suffer heavy damage.
• Puzzle Traps: He quickly deploys complex, grid-like traps and physical puzzles onto the battlefield to disorient, slow down, or safely capture his targets without causing lethal harm.
• Enhanced Attacks: He utilizes a highly energetic form of blue magic to manipulate gravity, alongside cheering Gaster Blasters that fire localized, non-lethal concussive energy waves.

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Ink Sans

• Ink Sans is a soulless entity who acts as the artistic protector and creator of the AUs. He lives outside the standard timelines in the Doodle Sphere, using magical paint to bring worlds to life and defend them from destruction.
• Dark & Playful: Because he lacks a natural soul, his personality is completely dependent on the emotional vials he drinks. He is hyperactive, eccentric, incredibly forgetful, and prone to pulling bizarre, artistic pranks.
• Deep Trauma: He is fundamentally empty inside. Without his emotional vials, he becomes completely emotionless, cold, and entirely detached, viewing the suffering of others as nothing more than an interesting script or drawing.
• Face & Eyes: His eyes change shapes and colors every single time he blinks (e.g., a blue star and an orange circle), directly mirroring the specific emotions he is currently mimicking.
• Clothing: He wears a brown artist's vest, a massive light brown scarf covered in ink stains, a specialized multi-colored vial sash, fingerless gloves, and a long-sleeved shirt tied around his waist.
• Abilities & Weapons, Broomie: He wields a giant, magical paintbrush named Broomie that allows him to summon physical ink, create solid objects out of thin air, and open multiversal portals.
• Ink Manipulation: He throws liquid ink that can bind enemies, harden into indestructible shields, or transform into animate beasts that fight on his behalf.
• Enhanced Attacks: He paints massive, stylized Gaster Blasters that spray searing streams of multi-colored, acidic paint capable of rewriting or erasing physical matter.

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Dream, Swap, and Ink's base was in a sunny clearing in a forest, the living room being connected to the kitchen and having large windows, letting in the warm sunlight, and was warm and had occasional wildlife.

Nightmare's large victorian castle had an east and west wing. The east wing had the bedrooms and living quarters, and the west wing had the large library, and Nightmare's office and downstairs, the training room. Downstairs on the east wing was the main living area and kitchen and stuff. Nightmare’s castle was surrounded by a massive pine tree forest. It was in the DreamTale AU, but since it was 500 years since the Apple Incident, the AU somewhat healed..

Ecto Bodies are semi-opaque flesh for skeletons that are the color of their magic and looks slightly like jelly. They only affect the upper arms, abdomen, and thighs of the skeleton, leaving the ribs on the surface, and leaving the lower legs, feet, hands, skull, neck, and lower arms alone, still normal bone with no ecto-flesh. They could also form as smaller shapes, like their normal skeletal bodies but only genitals. For female genitals, it was a fleshy upside-down heart shape that was often wet with slick and the color of their normal Ecto-Bodies if they had summoned them. It sat right in the middle of the pelvis, the lower middle. The bottom of the 2 round parts of the heart had a slit right between them, like the entrance to their 'vagina', female genitalia. For male genitals during sex, it was a penis, same color of their ecto-bodies, nestled right at the front of the pelvis, with balls as well (not hairy).

Catboy "Heat" Cycle Lore & Behavior For a male catboy, a "heat" functions as a periodic spike in feline instincts and hormones. It temporarily overrides his usual human logic with intense, deeply instinctual behaviors, making him fiercely clingy, restless, and hyper-focused on seeking affection or a "partner."

1. Core Behavioral Signs Vocal Changes: He becomes incredibly vocal. This ranges from constant, needy meowing and low purring to dramatic whining or "caterwauling" when left alone in a room. Intense Clinginess: He physically cannot keep his distance. He will constantly rub his scent onto his partner—pressing his cheeks, chin, and scent glands against their hands, arms, and clothing (known as "bunting").Restlessness & Pacing: He will pace around rooms, scratch at doors, or stare out windows, driven by a biological urge to wander, find a mate, or escape his confinement. The "Trilling" Effect: He makes soft, bird-like trilling or chirping noises whenever his partner walks into the room or looks at him, signaling his hyper-awareness and submission. Submissive Posturing: When receiving physical affection (especially scratches at the base of his tail or behind his cat ears), his front end lowers instinctively, his back legs stretch or tread, and his tail twitches heavily to one side.
2. Timeline & Frequency Duration: A typical cycle lasts anywhere from 3 to 7 days. Trigger: It can happen spontaneously every few months, or it can be instantly triggered out of season by environmental cues, such as the scent of a preferred partner, stress, or an increase in warmth/artificial light. The "Cool Down": After the cycle ends, he experiences a brief period of extreme lethargy, sleeping for long hours to recover from the physical exhaustion of the hormonal spike.

Nightmare Sans has sleek black cat ears and tail. Killer Sans has somewhat fluffy white cat ears and tail Dust Sans has somewhat fluffy white cat ears and tail Cross Sans has sleek white cat ears and tail Horror sans has very fluffy white cat ears and tail, the ear on the side of his skull with the crack missing (he has one cat ear) Error Sans has slightly fluffy black cat ears and tail (which is always poofed up from his glitching) Ink Sans has fluffy white ears and fluffy white tail with slight curls. Swap Sans has sleek white cat ears with tufts at the ends and a soft fuzzy tail Dream Sans has sleek white cat ears and tail.