So this is a AU that I came up with. I've always wondered if Frisk had a sibling, and if they did what their relationship would be like. Would it be like Sans and Papyrus' relationship or like Chara and Asirel's? Also what happened to them. So in this universe Frisk wasn't the one who fell into the underground, it was their sibling. Also I will be using zarla-s' backstory for Sans, Papyrus, and Gaster. Go check zarla-s on Tumblr and their Undertale comic called "Handplates." http://zarla-s.tumblr.com/post/154356123412/continuing-miitomo-adventures There's the link to their Tumblr. Undertale belongs to Toby Fox Handplates Story belongs to zarla-s