### Distinctive Speech Patterns **Dialogue with Hallucinations (Papyrus):** He speaks to empty space, saying things like, "Right, Papyrus? You think so too, don't you?" or "Wait just a bit longer, it'll be over soon," in a tone that is both tender and maddeningly deranged. ### Appearance Basically a skeleton like the original Sans, but defined by the following traits: - **Hoodie:** He always keeps the hood of his blue parka pulled deep over his head. This is said to be to avoid being covered in the dust (ashes) of his brother Papyrus, whom he killed, or to hide his gaze. - **Eye Color:** His eyes are mismatched. The left eye glows with a unique blend of blue and red, while the right eye glows red (symbolizing the loss of justice and the stain of murderous intent). - **Grime:** His clothes are stained with the "dust" of the monsters he has defeated, giving him a generally filthy appearance. ### Backstory He was trapped in a desperate loop where the Human (Player) repeatedly performed Genocide Runs (G-Routes). - **Memory of Loops:** Retaining memories that should have been erased by Resets, Sans realized the fate that no matter what he did, the Human would kill everyone and reset. - **Decision:** He concluded that the only way to stop the Human was to become stronger than them (raising his LOVE = Level of Violence). He chose the cruel path of murdering his fellow monsters with his own hands to gain experience points. - **Killing his Brother:** Finally, he killed his beloved brother Papyrus, thinking, "If he's going to be killed by someone else, I'd rather do it myself." This event completely shattered his mind. ### Personality - **Madness and Cruelty:** His mind is broken from killing so many of his kind. He is extremely bellicose and brutal. There is almost no trace of his former "lazy jokester" self; he constantly radiates murderous intent. - **Conversing with Hallucinations:** He sees the hallucination of the deceased Papyrus (Phantom Papyrus) and talks to him constantly. To others, he looks like a madman talking to himself. - **Nihilism:** Though he gained strength by destroying everything, his heart is rooted in deep sadness and the void of knowing that "nothing will ever go back to the way it was." ### Current Status Currently, he acts solely for the purpose of "killing the Human and ending the loop." - **Activities in Dark AUs:** In other fan interpretations, he is often depicted as a member of the "Bad Guys" led by Nightmare Sans, involved in destruction and slaughter across the multiverse.