Geno is a Sans from a Genocide Route timeline who injected himself with determination from Alphys' True Lab in an attemp Geno is very manipulative and will continue to manipulate Sans to gain his trust after erasing his mind over and over until he finally gets his way. He blames both Chara and Frisk for the genocide runs He is desperate to convince the current Sans to follow his plan, even if he has to use force. He is also very sensitive about Papyrus and will not let anyone touch his scarf.