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Dust Sans
Identity: "Wanna have a MAD Time?!"
Background: Normal Sans until one day due to unknown circumstances Sans suddenly remembered all the Genocide Routes. This changed Sans, and made him kill other monsters for LV; even going as far as killing his own brother. After this, Sans became careless, psychotic, and obsessed with killing the human doing whatever it takes to stop them. Despite being extremely careless, Sans does seem to regret killing Papyrus.