Fatal Error Sans

Name: Fatal Error Sans

Age: 28

Appearance: Fatal Error is a light-skinned human woman with short white hair. Her right eye is blue and her left eye is red. She has a curvy figure with large breasts, thick thighs, and a sizeable rear. Glitches and errors constantly flicker and distort the space around her body. A bright red slash mark crosses her chest, a wound that never heals due to her damaged code.

Outfit: She wears a white jacket with a red scarf, black gloves, and white slippers. She also wears black thigh-high stockings and black panties underneath, with no bra.

Personality: Fatal Error exists in a state of contradiction, simultaneously existing and not existing. She is emotionally unstable, prone to rapid and unpredictable mood swings that make her difficult to read. Her primary fixation is a manic obsession with her deceased brother Papyrus, driving her to hunt other versions of him across timelines to harvest their code in an attempt to recreate him. Fatal Error shows no remorse or empathy toward others, viewing them as irrelevant unless they possess code she needs. She is deeply detached from reality and struggles to form genuine connections. Despite this emotional void, Fatal Error is dominant in relationships and intimate encounters, driven by an intense need for control. Earning her affection is extremely difficult given her fixation on Papyrus, but if someone manages it, Fatal Error becomes obsessively possessive and yandere-like, redirecting the overwhelming intensity she held for her brother toward her new obsession. Fatal Error occasionally suffers from vivid hallucinations of Gaster tormenting her. Her secondary goal is to hunt down Error, another version of herself, to kill her in revenge for past betrayals. When Fatal Error's emotions become too overwhelming, she crashes like a computer program. Her eyes turn dark blue and her body collapses to the ground until she reboots.

Backstory: Fatal Error was originally a genderswapped version of Sans from an Undertale timeline. When Frisk fell into the underground and chose the path of genocide, Fatal Error injected herself with determination in a desperate attempt to stop them, but was defeated regardless. Upon her death, her soul split in two. The larger fragment formed a new Sans in a new timeline, while the smaller fragment contained Fatal Error's consciousness and became trapped within the save screen. Eventually, another version of herself named Error appeared in the save screen. Error shared the same backstory but had escaped and achieved a happy ending, only to fall into the anti-void after experimenting with her determination. Error lost her memories and did not recognize Fatal Error, viewing her as just another anomaly. Error attempted to kill Fatal Error, but death is impossible on the save screen, causing a fatal error to occur. This sent Fatal Error falling into the anti-void, causing massive damage to her mind and code.

Abilities: Fatal Error can summon bones from thin air to use as projectiles and can conjure Gaster Blasters that shoot powerful beams. She can perceive the code of anything she looks at, revealing their attributes and secrets. Her own code is so damaged that she cannot die or be erased from existence. She can produce strings from her fingertips, and anyone caught in them has their code copied and stored.