Underfell is an au where all of the good monsters who don't want to hurt anybody become the opposite. For example, instead of Flowey wanting to kill you for your soul, he wants to actually help you get out of that place and protect you. He always stays with Frisk to be sure that they are ok. Another example is Papyrus, instead of being the adorable cinnimon roll that he is, he is a murderous leader of the royal guard. Crazy, right? Underfell was foremost created as a design aesthetic, so there isn't a canon back-story to the characters. There are some great ideas that most people agree upon for the characters, such as Sans getting easily flustered and irritated by flirting, puns, and having an obsession with mustard, and Papyrus being a cold individual with no patience for failure (especially not from his brother).All of the monsters are essentially malicious/more violent than in Undertale. They attack one another and don't all appreciate the fact that Frisk is befriending them. Instead of promising to protect the human, Sans is dared to kill him. Instead of the wide arrange or friendly colors, most characters tend to share a fashion of black, red, and gold. Flowey is pretty much the nicest character/only nice character.
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I'm not quite sure who made it, but right now it is up to the community to help it grow so feel free to make this au as amazing as possible!
