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Underfell is one of the oldest and most popular alternative universes (AUs) of Undertale. Its core premise flips the script: the Underground operates strictly on a "Kill or Be Killed" philosophy, transforming almost all regular monsters into hostile, edgy, and aggressive versions of themselves. Because Underfell is an open-source community-driven project, there are various takes, but the canonical and most widely accepted designs and personalities for the primary cast are detailed below. 2. Sans ("Mustard")

  • Appearance: Wears a black winter jacket with a fluffy, flame-like hood, a red sweater, a golden chain necklace, and black pants with yellow stripes. He sports sharp teeth (including one gold tooth) and his left eye glows a permanent, intense red. He is constantly sweating from stress.
  • Personality: Heavily stressed, deeply cynical, and sarcastic. Unlike original Sans who loves puns, this version prefers dark knock-knock jokes and is addicted to mustard instead of ketchup. He lives in constant fear and under the abusive thumb of his brother, Papyrus, whom he is forced to call "Boss". Though technically immensely powerful, he suppresses his magic because unleashing it hurts him physically.
  1. Papyrus
  • Appearance: Tall, sharp, and intimidating. He wears jagged, battle-ready armor with heavy spikes, and his face features a permanent sharp, menacing grin with scars over his eye.
  • Personality: A ruthless, bloodthirsty megalomaniac. He is the captain-in-training (or high-ranking enforcer) of the Royal Guard who rules Snowdin through fear and intimidation. He treats Sans with extreme harshness—often physically abusing him—and is entirely obsessed with hunting down humans to gain status and please Asgore. Instead of spaghetti, he likes to cook menacing dishes like lasagna.
  1. Toriel (The Caretaker of the Ruins)
  • Appearance: Features torn, tattered dark robes, sharp claws, and glowing yellow eyes. Her clothes are often ripped from tending to her sharp, thorny rose garden.
  • Personality: Bitter, stern, and borderline unhinged. Unlike her motherly original counterpart, she views Humans who needs to be destroyed before they can escape. She is notoriously terrible at baking normal sweets, instead specializing in harsh meat pies. She retreated to the Ruins out of disgust for Asgore's tyranny rather than mercy for humans.
  1. Undyne
  • Appearance: Wears dark, aggressive tactical gear or latex clothing with heavy armor, styled with dark/matte lipstick.
  • Personality: Still the Captain of the Royal Guard, but far more tyrannical and brutal. She serves Asgore blindly, enforcing his laws with an iron fist. She lacks the passionate, theatrical sense of justice from the original game, operating instead as a cold, calculating military enforcer. (In some interpretations, she maintains a secret, softer soft-spot exclusively for Alphys).
  1. Alphys
  • Appearance: Wears sharp, swirled glasses (often gifted by Undyne), maintains a stiff, arrogant posture, and wears a jagged lab skirt.
  • Personality: An arrogant, highly confident mad scientist with virtually zero empathy for test subjects or lower-class monsters. She treats her scientific experiments with cruel indifference, viewing herself as intellectually superior to everyone else in the Underground.
  1. Mettaton
  • Appearance: In his rectangular form he has two arms, but in his EX form, he features four arms (two of which are manipulated mechanically by Alphys) and a chilling, perpetual smile.
  • Personality: Narcissistic and mechanical, functioning almost like a Terminator-style killing machine. In some versions, he is deeply unpopular, driven entirely by a desperate, glitchy desire for ratings, or forced to act as Alphys's lethal puppet.
  1. Asgore Dreemurr
  • Appearance: Significantly larger, more muscular, and menacing than his original counterpart, wearing heavy, spiked royal armor and a dark cape.
  • Personality: The ruthless dictator of the Underground who formally established the "Kill or Be Killed" mandate. He is cold, unyielding, and completely apathetic to the suffering of his people, ruling strictly through power and fear. He is directly responsible for poisoning the fallen human Chara, which triggered the societal downward spiral of monsterkind.

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