Error Sans, Geno Sans, Fatal Sans, Error404 Sans

Appearance Geno looks like a normal Sans, but with signs of terrible damage from Determinism:

Eyes: The left one is yellow (like the regular Sans). The right one is covered by a white glitch, hiding part of the skull, which is melting due to the Determination overload. Glitches: There are white particles-glitches hanging around him all the time, which he controls himself. Blood Color: Red, like monsters, but flows from the eye, mouth and wound. Clothes: Black sweater, blue scarf, blue slippers - like the canon Sans. Personality Geno is manipulative, desperate, and obsessed with revenge. His motivation is to destroy the entire universe to end Papyrus's endless deaths.

Manipulator: He tries to control the other Sanses to force them to carry out his plan. Sensitive to Papyrus: No one can touch his scarf - it is a sacred memory of his brother. Mad but not evil: He doesn't want evil - he wants to stop suffering Capabilities Geno has all of Sans's standard abilities, but with some unique changes:

Bones, blasters, teleportation - just like regular Sans. Glitch Control - Can hide his true face and manipulate visual effects. Save Screen Access - Can summon other characters to the save screen, but only through physical contact with Sans. Invulnerability to resets - since it is outside the timeline, it remembers all cycles. Interesting facts He cries blood - his tears are red, just like his blood. Doesn't Like Christmas Parties - Appears in the Christmas Party AU comic, but doesn't enjoy the festivities due to the chaos. The eye, hidden by the glitch, melts - this is a consequence of the introduction of Determination. The yellow part of the eye turned red, and the light blue part turned dark blue. Not canon, but one of the most popular AU characters.

Appearance Costume: Black sweater, black trousers with blue stripes, blue slippers with an “X”. Socks: Black. Eyes: Distorted, like a screen with static. Hands: Black, with signs of "lags". Fingertips: Blue. Back: Number "404". Personality Error 404Sans is cold, calculating, and super-intelligent. He:

Silent, but knows almost everything. Loves control and hates betrayal. A sociopath, but not for evil, but for the sake of “order.” Obsessed with bringing back Alphatale, even if it means destroying everything. He loves solitude, but talks to his brother’s ghost, Alpha. He doesn't believe that Alpha is alive, but continues to "communicate" with him in order not to go completely crazy. Capabilities Error 404Sans is one of the most powerful characters in the AU universe. His abilities are almost godlike.

🔸 Basic abilities Blue Mastery: Can move objects and creatures up to 500 meters away. Can completely destroy a soul, causing instant death. Used for mind manipulation. Mind Manipulation: Complete control over the soul of another being. Can make anyone serve him. Dark Blasters: Created by the Astral Mother. Damage: 750 (after Mainframe upgrades). Unrivaled Power: Can lift 222,900 tons. Immeasurable speed: Reaches the center of the universe in minutes. Flight and Soul Evasion: His soul deflects attacks, critical hits are only possible physically. Pixel Manipulation: Can turn air into pixels, creating objects or restoring the body. Mommy's Boy: Transforms the soul into fear, causing panic in any creature with a soul. Balance conductor: Can manipulate the fabric of reality, but has not yet fully mastered this power.

Appearance ErrorSans is a black, glitchy skeleton with unstable textures. His appearance constantly distorts, like a damaged screen.

Eyes: Left: small yellow pupil. Right: a circle with blue, yellow and black stripes, like a disk. Blue threads emerge from his eyes, which are his main weapon. Cloth: Black cloak with a hood. Red shirt. Black boots. Blue scarf. I used to wear glasses, now I wear contact lenses (due to myopia). Color palette: dark red, blue, yellow, orange, black. Personality ErrorSans is a Chaotic Evil with antihero elements.

Psychopathic and hypocritical: considers himself a "cleaner" of universes, but is himself an anomaly. Hates glitches and AUs, but he himself is one of them. He is unemotional, but sometimes shows outbursts of anger, especially when he sees the words "Error". Obsessed with order: wants to destroy all alternate universes except one - but doesn't know which one to leave. Loner: lives in the Anti-Void, plays with dolls (which he turns captured Sanses into). Has haptophobia - fear of touching. Capabilities ErrorSans is one of the most powerful characters in the AU universe. His abilities transcend physics and code.

Strings: Pulls blue threads from his eyes and hands - concentrated telekinesis magic. Can draw out souls, destroy them, control bodies. Turns captured Sanses into dolls that he plays with. Portals: Opens passages between universes. Can observe the past or other AUs through portals. Code manipulation: Reads and partially modifies the code of universes. Sees everything as lines of program code Glitch-hop: Instantly moves between AUs and timelines. Can observe universes in secret. Faster than Light: Dodges attacks at the speed of light. His reaction time is almost instantaneous. Special attack: Can destroy all universes in a second. I used it only once and don't plan to do it again. Immortality: As an error, it does not obey the laws of the universes. Cannot be killed by normal means.

Appearance Type: Skeleton monster, glitch. Eye Color: Switches between blue (calm), red (aggression), and static (panic). Peculiarities: Digital interference and white noise are visible on the body. Threads of code, resembling wires, run through the skull. The clothes are distorted, as if damaged by bugs. Often accompanied by visual effects resembling a screen glitch. 🔹 Abilities The dice are the same as those of regular Sans, but with modified mechanics: they can be red, blue, orange, rotating, etc. Threads - Can manipulate threads of code, taking over the minds of other beings or distorting their behavior. Blasters - Powerful, destructive blasts reminiscent of Gaster's blasters. Teleportation - like all Sanses, he is able to teleport. Copy and Paste Code - Can copy other characters' code and paste it, creating copies. Portals - creates passages between universes. Binary vision - sees everything as a code, which causes him to have panic attacks. Immortality - even his own attempt at self-destruction does not kill him. Psychology and motivation Fatal Sans is a being consumed by obsession and pain. He strives to resurrect his Papyrus, but he can't simply copy him—in each Papyrus's code, he sees the inscription "not mine," indicating they are not his brother. This makes his mission futile, but he continues, even if it "kills him."

He doesn't trust anyone, including Nightmare Sans, and believes that if something seems too good to be true, it is.