LostTale!Sans or simply Lost!Sans, is one of the main protagonists and characters in the AU known as LostTale, where he is the older son of W.D Gaster and the older brother of Papyrus, as well as a close friend to Frisk.
Backstory = Lost!Sans originated from the universe known as LostTale, where he is the oldest son of W.D Gaster and the older brother of Papyrus. He grew up in his AU alongside his younger brother Papyrus. At some point, he befriended both Undyne and Alphys, along with becoming close friends with Frisk. Being the first son of Gaster, he worked as one of his father's assistant scientists, alongside his old friend Alphys. Sans shared an extremely close bond with his younger brother Papyrus, who he was very fond of, as he said he taught Papyrus everything he knows. Overall, he lived happily in his AU, till Chara started killing all of the monsters, including Papyrus. So, Sans and Frisk stood against her, with them losing, then Frisk allowed Sans to absorbed her determination soul, boosting his powers and abilities, to combat Chara. While the battle continued, their entire universe was glitched out, with Sans ended up in another universe. Sans named himself Lost!Sans, and he hope to find and rebuild his AU. During his travel through multiple universes, he befriended UnderTale.Last!Sans, AfterTale.Black/White!Sans, UnderFell.G!Sans, SwapFell.BLK!Sans, and many others.
