When you find an old character you made for a video came had the story and the design so you change it meet Pandora and undertale character of mine originally she was a cat monster but now she is a human who fell 6 years before the main game. She keep herself hidden. A head canon I have is that humans slowly turn into monsters the longer they are in the underground.

Undertale is owned by Toby fox
Pandora is owned by me