Lore:

One day, before he was eliminated sans, instead of an error occurred happening to him, making him remember that the human kill us all, which is a constant loop of dying multiple times, which sans has enough of it, making him to gain some LV and exp to stop the human and save the fantasy.

Some facts about him:

He has a cloak before anyone sees him.

He has stuffs during picking.

He had a arrow and a crossbow.