What if there wasn't AUs but instead they were all personalities in Sans's multiple personality disorder? Well that is the reality Papyrus and the others are currently living in though they've gotten used to it. With the arrival of Frisk some things may change for all of them. Could she be the key to figuring out how to help Sans? Or will that be the surface? Rated M for themes

(Originally posted on AO3 on 5/12/23) An undertale post true pacifist route salphys fic with fluff and some hurt/comfort. Alphys needs help with taking steps to overcome her trauma related to the True Lab, and she knows who's perfect for the job. But things take an unexpected turn after a while...

With a quick use of Sans' magic, we had returned to our home on the surface. The lovely three-story home sat quietly among the trees under the moonlight. Sans always loved to teleport just outside the door and glance at it before walking in. He was a little less lazy since coming to the surface. So much to learn. So much to do. So much to love. SEQUEL TO "TWO WORLDS, TWO SOULS"

Frisk. In one universe, they are a child of the surface, falling to the Underground, to save or to kill. But here, a choice made before they are even born ends with them being a child of the Underground. Follow them through their life as they grow and learn, raised by Monsters and become the shining light in a dark world.

(I started this a while ago and uploaded the first version of the first chapter on another account and have since lost access to that account. I’ve changed a lot of the story since then.) Sans, Frisk, and their AU variants discover each other’s worlds and end up on a high stakes mission to get a valuable item back from a rather dangerous and uncooperative version of Sans.

How would things have gone differently if the six children that fell into the Underground before Frisk were taken care of by the monsters of the Underground? SPECIAL THANKS TO DREAM1990 FOR THE REQUEST!

[Underfell AU] Undyne is weird, and Papyrus doesn't like it. But by the time he tries to understand why, Undyne gives him the lead of the Royal Guard and disappears from his life. But why? Papyrus investigates, as some people try to dissuade him too. Probably because all the tracks are leading to Asgore, and that if he doesn't give up, he might lose way more than his job.

10 years after the barrier was broken, 1 year after the first attempt at peace talks, there is a young woman who is willing to sacrifice her quiet life after 10 years of remaining in the night world of humanity to make sure things go peacefully. However, where there is Light, there is always Darkness.

"The little girl just could not sleep because her thoughts were way too deep, her mind had gone out for a stroll and fallen down the rabbit hole." - A life of fear is not what Frisk ever expected to have. - Warning: this is a dark AU that tackles mature themes and is not recommended for sensitive readers.

After getting through the entirety of Undertale and Undertale Yellow, the latter being able to be beaten on every route, Scarlet Johnson wakes up from a slumber to find himself in the body of Frisk and being joined by Chara. And after learning he's in the Undertale universe, but with nods to Undertale Yellow, he needs to get through or die trying. T rated for language and innuendo.

After doing everything the right way in the first timeline, Frisk was compelled to do the genocide route for what they felt were "good" reasons. In doing so, they have broken utterly and become something new. Something absolutely devoted to Sans, and not remotely sane. Now they are striving to fix everything and find their path forward. What the hell is Sans supposed to do now?

No matter how many times we remake this world, the memories of past friendships still remain. For some of us anyway. These are the tales from the Underground, recalling laughter, tears, and some truly ghastly spaghetti.

Luna ends up in the Underswap universe. Done as a request for paradise dazzleshine. :)

just a few one shots for my OC of ErrorSans, Sol Reapa. one of the few known as a traveler. that means Sol can move though the void between multiverses. I have expanded this to an ability to move around the entire multiverse, regulating undertale AU multiverses to a 'pocket verse'. this way it is easy for him to go to other fandoms. so large crossovers will happen.

A kid falls down a vast chasm into the deep, and is set upon by countless monsters eager to murder whoever falls down and claim their souls. Somehow, this child is the villain in your story.

The world is destroyed. Strange creatures no one has seen before have swarmed the planet, killing everything save a small band of Monsters, and soon, even they will be gone. Their only hope, a thousand years in the past. Traveling back to the war of humans and Monsters, Frisk and their friends hope to change the outcome of the war to avert this horrible future.

"El jugador" ha muerto... Y ahora todos quieren JUGAR. En la peligrosa Ebott City, radica una constante inconformidad por habitar monstruos y humanos en un mismo lugar., desatándose conflictos delictivos que atentan con la vida de los habitantes. Sin importarle las advertencias de su madre, Frisk decide ir a la ciudad y tener su florería junto con su compañero y mejor amigo Flowey

Does not contain the word 'f-ck'. (sh!tpost)

According to all known laws of aviation, a bee shouldn't be able to fly... (sh!tpost)

You know, being dead for a couple of centuries gives you time to think. About your choices. About those you hurt. And for me, it gives me the opportunity to mourn and fester in the guilt of being unable to save the ones you love.

And ends the world. (sh!tpost)

Basically a literary port of a YouTube video, which itself is a parody of the SLACKICiRCUS techno cover of the song by the 4 Non Blondes. Papyrus accidentally absorbs Frisk's soul, and, now bursting with DETERMINATION, grows fabulous hair and cannot hold his urge to SING! (sh!tpost)

Obvious spoilers. My thoughts on Undertale. (sh!tpost)

For Monsterkind, the Surface represented freedom. For Frisk, it's a return to some uncomfortable realities. It all began with a simple wish. When that wish faded, Frisk tried to move on. Except, 'moving on' was not so simple. Emerging from the Underground had put them in a worldwide spotlight. From an unknown child, they had become an icon of great value.

Ce one shot ce situe durant l'époque ou Chara à vécu dans l'Underground, avec sa famille adoptive composé d'Asgore, Toriel et Asgore et ce centrera sur comment c'est passé son enfance parmi les monstres.