Unknown

Description: Unknown is the name of this sprite. She is Undyne's forgotten sister and she hates humans and other monsters. She can be found in Hotland but not Waterfall because when they were young, they ventured into Hotland but Unknown suddenly slipped and landed in the lava below. She is not dead but she had lost her legs and her right arm in the process. Unknown has also been part of one of W.D. Gaster's experiments. If she hadn't, she would've died from her injuries. She can rarely be found around where you meet So Sorry so she's well hidden. You'll most likely see her if you do a Genocide run but she can appear in the Pacifist and Neutral run. Though, there is one big secret that can be revealed if you end up sparing her.