Papyrus: WHO ARE THESE GUYS? Sans: friends. Papyrus: THAT'S WHAT YOU SAID ABOUT THE OTHER ONES. Sans: i know. so..? Papyrus: 3 OF THEM ARE DEFINITELY LITERALLY ALMOST TRIPLETS. Sans: so what if monster friend, 8-bit operator, and determination are triplet sisters, er, brothers, er.... Papyrus: ONE OF THEM IS THAT VIDEO GAME ITALIAN PLUMBER GUY, ONE HAS A GUN, ONE OF THEM IS THE INCOGNITO SYMBOL, AND ONE IS A CAT SKELETON. Sans: ........................... Sans: shut up. Papyrus: WAIT IF MONSTER FRIEND IS THE SISTER AS IF I KNOW TO STAR WARS THEN WOULD THAT MEA- Sans: shut up
So as Papyrus said, Scratch is based off of Scratch Cat, and Cat skeletons. Mystery is the incognito dude. And S. M. B. Wii is Super Mario. As he's the Super Mario Bros Wii Typeface.