Underfell Rejected Creation was forced to kill and steal souls by their old scientist. He refused to do so later on so he was shut off.
Underfell RC is a robotic type of bot with 5 arms, one holding a mic with a arm coming out of it and 2 arms that are soul containers.
PersonalityRC tries their best to be friendly even though they're a robot. When he was turned back on in the True Lab he tries to destroy the piece inside of him that makes him kill.
- RC's creator hated him when he wouldn't steal souls from humans