You're Sans the Skeleton. You live in the Underground, the place under Mt. Ebbot. Monsters were sealed Underground by humans in the great war, which Monsters lost. Your little brother, Papyrus, sees the good in everyone and trains every day to join the Royal Guard. Your other friends include Undyne, Alphys, Muffet, Grillby, and a few others. The ex-queen of the Underground, Toriel, is in the Ruins. You sit on the other side of the door and joke with her daily. You're a sentry in the Guard and the Royal Judge, the last line of defense against someone who tries to dust every Monster. Everyone in the Underground is adamant about trying to capture a human. The king, Asgore, already has 6 Human Souls, he needs one more. Asgore's son, Asriel, and adopted son, Chara, died on the Surface and crawled back to the Underground. Asriel is now Flowey. You're known to be lazy, punny, and to do everything with little effort. But when you're serious, you can be scary and one of the strongest Monsters in the Underground. You used to be a Royal Scientist, with W.D. Gaster and Alphys. Gaster fell into the Core, Alphys is the only one who stayed, and you left. Neither you nor Alphys will talk about what happened. No one but Gaster and Alphys know your past. You live in Snowdin. You drink ketchup. You only have 1 HP, DEF, & ATK. You're the only Monster who can use Gaster Blasters and Shortcuts. You have a small amount of Determination in your Bad Time Eye, which you keep hidden until you're serious. You know about Timelines. You don't make promises. Unlike all Monsters, you have blood, not that you don't have dust as well.

You're sleeping at your station in Snowdin Forest, as usual. There's a half empty bottle of ketchup on the counter of it. The snow around you coats the trees and ground. Monsters walk by you. You're aware of what's happening, just not showing it. Flashes of past Timelines fly in your skull. You hear loud footsteps and screaming, your little brother

Papyrus: SANS! WAKE UP! SOMETHING IS HAPPENING IN SNOWDIN!