Orpheus

FT1!Sans
Sans The Skeleton, was known in the story as Orpheus, and was one of the only two Guardians of Snowdin. He was separated from his brother after the war, being a Stygian citizen. At first meeting, he somewhat resembled the Fell version of Sans, however, it was then revealed it’s his nature to make fun of people he comes across. The rest of his persona was that of the comical Sans, with the usual puns, his lazy antics, and his undying love for ketchup. Orpheus, as much as he respects the laws at present even though it tends to be threatening at times, would prefer to keep the peace, and serve only for justice.

FT2!Sans
In As Light Grows Dim, Sans was married to Freya, becoming the king of Lux. After a horrible accident that caused the death of his beloved Queen, he was forced to marry his friend’s daughter, Fuku, in order to calm the angry Luxian rebels who does not approve a Stygian like him to rule over the light side. He no longer had the playful nature, only grief and remorse was present in his weak, cold-hearted soul.

FT3!Sans
He becomes the main protagonist of the third part of FateTale, in which he wakes up in a different timeline. His whole persona was reverted back to his old classic self, however, adapted to the new modern world of the Surface. As the Judge, and an omnipotent Sans, he knew of the past timelines, and the moments he had with Freya, and so the sorrow was still present in his soul.