idk why i made this but i think it will help you understand this guy better
1. The crack in his noggin is from training with Undyne. The story goes that Undyne was doing training practice with Sans, and Undyne accidently speared him in the face. Ouch. 2. Yes, Papyrus forced Sans to be in the Royal Guard. Sans is a bit more active, but still lazy overall. Papyrus is still not in the Royal Guard. :( 3. Sans does melee attacks with magic attacks, so he can beat you up himself, or with magic. Hence the purple glove. 4. sans drinks liquid concrete now i mean what do i say about that lol 5. There is something in his pocket, but he won't tell us what it is. Dang it. 6. He loves suckers and lollipops, and uses magic to hoist one near his head for "emergency lollipop snacking". 7. Sans has a tie that he wears for the Royal Guard meetings. He doesn't have to wear one, he just likes feeling professional in meetings. 8. His jeans are much too long, but he doesn't care enough to shop for new ones. 9. He is a tad bit shorter than the average Sans because he's getting older.