Like my AU list for Gravity Falls this is just a list for all the Undertale AUs that are out there. Trust me there are a LOT..

(book 2/2. last book: secrecy) Sans finally reveals his past. but who is W.D Gaster?

When Ink is exploring the au's, he stumbles upon a new au where he meets a new friend named Nightmare. The both of them create a close bond, and Nightmare explains how the villagers mistreats him and how they treasure Dream. Ink knew Dream for awhile, but Dream never mentions Nightmare. One day Nightmare had enough of the villagers and ate the apple of negativity and leaves Dreamtale empty. When Ink comes to visit Nightmare, he sees that everyone is disappeared, and so did Nightmare. Not mention Dreams new and unusual behaviour towards Ink. [All artworks in this story, including the cover, belong to me. I kindly ask that you DO NOT use them, post them, trace/edit them, or claim them as yours. It's rude and highly frowned upon. Thank you.]

Classic merely wanted for Fell to keep his promise. He wished that they'd always be there for each other. Fell constantly got into his own head, fearing the thought of commitment to his soulmate. Fell convinced himself that he couldn't be the mate that Classic needed. Classic deserved more than that. According to Fell, Sans would eventually grow tired of him just like his own brother Edge had done. But in his heart, he wanted Sans more than anything. Fell's own insecurities within himself only pushed him farther away from Classic. Soon enough, Fell had to go back to his own world. The kid had started another timeline again. Two years passed in the pacifist route. Fell found peace with Papyrus. They had a nice home on the surface. The kid didn't plan on resetting any time soon. Fell finally found hope again. He didn't always have to doubt himself anymore or sleep with one eye open. Fell suddenly remembered his promise. Classic had been waiting on him. Was it too late? Could Fell still go back to him? When he stepped into the au he used to call his second home... Fell found out that he wasn't the only one who had changed... Hi~ It's OreoDaSkeleton! The aus and art presented in this book aren't mine. HoWeVer! The writing is definitely and 100% mine! Thanks for checking it out and I hope you enjoy your reading!

Gaster is the current royal scientist, set with a mission to break the barrier and free monster-kind from their underground prison. His loyalty and persistence to the task is clear, since he'll make whatever sacrifice necessary to complete it. However, even a perfectionist can be blind to some of their own flaws. Gaster has a habit of pushing things or himself too far. An accident occurs in the lab. Whilst trying to save him; one of his lab assistants, Y/N, gets injured. Burdening himself with even more pressure and guilt to fix it, Gaster thinks that doing all of her work for her will cover up the incident. Still, the sad reality is that the damage can't be undone. Well, Gaster ends up spending more and more time with her. As a result, both of them gain an entirely new perspective of the other, they aren't just another monster in a lab coat anymore. Hey! It's Oreo aka Writer~San! Undertale, it's characters, and it's fanart do not belong to me. However, the story does!!! I hope you enjoy it! (^w^)~

One little incident One little act One little tast of his kindness Was all it took for Error to become OBSESSED with the little Gaurdian of Positivity.

Sans has lived through countless timelines. He's seen the kid make friends with everyone, only to give up in the final moments. He's seen the kid killed, over and over and over again. Sometimes, he'd even done the killing himself. And no one ever remembers. Not even the kid herself. It's an exhausting cycle, one that never seems to end. But there's something different about this run. Another human's fallen down... the kid's sister. Please note the the story is primarily on Quotev, so updates to Wattpad may be late, or lag behind that of Quotev. The story also has the potential to become mature. (I haven't decided yet.)

Hi! this is my first post- there will be sin in this story, so please be aware of that and we will we all see the fun ink and error will have!~ enjoy!!!

(Ink is a girl in this,kay?) After another long and hard battle against Ink,Error starts to release he's fallen for the little girl. Error kidnappes Ink,and starts to use her as his maid. read to find out more! (this contains sin btw)

Ink the souless creator isn't trying to find love. he only wants a friend, sooner or later he'll find that he has tons of friends-- Okay wait. The stories derailed Ink is now fighting a multidimensional war his timelines fate is in his hands and his loved ones coiled around that of the new threat. Will Ink be able to stop the ultimate continuous reset of the multiverse from the mysterious sanses and save his love for Error or will he succumb to his new end. --- Story may currently be in rewrite. --- CW//SPOILERS// - Will reference underverse events. Explination for some counter details; The tree of feelings is still damaged, a sapling broke through the stub and a new tree began to grow. Nightmare is reformed and back to Night after previous untold events, and Cross as well is no longer sharing a body with Xchara