This is an AU called the Brothers AU where Neo is a completely different being from Mettaton. They share a soul, but Neo got I guess what you'd call the "bad part". Don't forget to comment and vote if you like it! This is a collab with @kindlethebrezeon. NOTE: there is some kind of OC in this. But don't be alarmed, she's only here for depth in the story. Credit, of course, to Toby Fox and his colleagues.