Its undertale with underswap behavior. MI Sans is the first monster you meet in sundown. He is Papyrus's younger brother and Undyne lab assistant. He wears a blue lab coat. His initial blue-light bluish scarf, goggles on his forehead and blue boots. He follows Frisk as they walk into sundown. As he's following them he trips over a rock. Once Frisk is at the bridge, he creeps up on them at 20 df 20 gender male species skeleton. MI Papyrus is the older brother of Sans and lieutenant of the royal guard holding jurisdiction over the E3 unit. In sundown town he first appears along with Sans after Frisk leaves the Core as a supporting friend and is fought as the second boss before Frisk exits sundown. MI Undyne is trapped in a cage of lies not so bad kinda scared of the real world. MI Alphys wears a yellow yelp lab coat, light yellow jeans and blue boots. She got a robotic eye that shoots lasers. MI Asgorel is unhappy with his situation and makes monsters do her dirty work and helps kill humans. MI Toriel believes Asgore is wrong.