In a reality where existence is a jigsaw puzzle of shattered worlds, a certain doctor has survived the collapse of his own universe and now embarks on a mission to build something new. Join one W.D Gaster utilizing the Observer, a creation of his own design, and navigate a realm where perfection is a mirage and every piece of a broken world holds the key to a bold new beginning.

The Underground is divided. Evil lurks in the darkness as hope slowly fades away. Only a human, a monster, and a dead prince can restore this corrupt kingdom, but not if it corrupts them first.

"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

It's only thanks to you that I could change from a sadistic ogre to what I am now. I feel alive for the first time. I can't thank you enough, but I can write down my story. - This story follows Frisk and Chara from a genocide run to a truly happy ending!

A human who was once tainted with hatred and distaste for monsters has started to see the wrongness of her actions when she had gone to Aynor Village, the last monster town damned to be liquidated by human hands..

after the sixth human died, Toriel couldn't endure watching another child fall just to meet their demise, so she asks sans to seal the entrance to the underground. stopping Frisk's arrival, the "system" glitches and tries to find a new host, the closest one he has is the judge of the underground: Sans the skeleton. Undertale

Asriel is miraculously revived and is living happily with Frisk, Toriel, Asgore, and the other monsters. But Frisk has a secret, and Chara is tormenting them for it. 3 years later, they go back to Ebott and help Chara regain their compassion after having an empty soul for so long. A year after, Frisk is still the tiniest bit resentful towards Chara cuz..y'know. Fem Frisk Male Chara

The butterfly effect is known as "a property of chaotic systems by which small changes in initial conditions can lead to large-scale and unpredictable variation in the future state of the system." The smallest of changes make the largest of impacts. So… What if when Angel and Frisk fell… they fell into different locations? Squeal "One World, Two Souls", and "One World, Many Souls".

After falling into the Underground, Frisk is found by a young Monster and taken home, where they find friendship and family, and make a new life for themself in the Kingdom of Monsters. But despite the happiness, something lingers in the back of their mind, and soon, they find a way to repay the kindness which they have been shown.

A household full of skeletons are competing over the attentions of one love. This isnt that house though. Unknown to the group secretively wrestling with their unpredictable love lives and universe-meddling machine, another house a few doors down has been gifted with its own skeleton posse clamoring for the attentions of their own little lady. A little old lady by the name of Mabel

The little Sansy is odd, even for a Bitty Monster. He just wanted to escape his terrible reality... Turns out, he had a quirk. A random Bittybones request fic off my tumblr for reblogslol4545. And for anyone else who might enjoy it. Genderless OC called Y/N. -I mean 'Yin'. TW for blood (stains on clothing), some minor swearing, and some unfortunate rats.

Sans is afraid to dance, Papyrus is worried, and frisk want to dance with him at least once. The rest of the family is happy to help.

What if the six fallen humans who died before Frisk never died and instead joined Frisk on their journey through the Underground? It all seems good... aside from Frisk. Why are they really in this timeline? What do they want? Join the other six as they try to learn about 'the eighth human', why everything is so strange and how to escape the underground. [Cringe cover by me] DONE!

Golden Quiche / Crimson Keeper specific universe. A 'Chronographer' is a title reserved for those with the power and authority to observe, manage, and record the annals of spacetime. They're the primary historians of this world.

Frisk no longer exists. Chara has become the main character. After 1000 years of genocide, something new happens, and Chara is thrown into a whole new underground. Will Chara manage to survive this new environment? Well, let's see how much determination they'll have after exploring the new routes this new game has to offer! Rated T for minor adult themes.

Daniel es un chico de 20 años con un gran apego a su cariñosa madre, pero ella contrae una peligrosa enfermedad que le costaría su vida, para poder curarla necesita un ingrediente muy especial. Flores Doradas, Daniel debe partir al Monte Ebott pero caería en un agujero que lo lleva a conocer un nuevo mundo y a una bella mujer cabra, del cual el se enamora perdidamente.

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.

"… ¿Sabes?… Yo realmente… odio mucho el verano" Dijo ella mientras le miraba con una expresión cansada. Frisk ladeó la cabeza levemente, café y cian encontrándose, inseguro sobre como interpretar sus palabras. Pero, aún así... con todo el dolor y el sufrimiento que sus hermosos ojos ocultaban de él, aún había algo que decir. "¡Pero eso no significa que odie estar contigo, Frisk!"

"You know... I really hate summer" She said while looking at him with a tired expression. Frisk tilted his head slightly, brown and cyan meeting each other, unsure of how to interpret her words. Yet, even so... with all the pain and suffering her beautiful eyes hid from him, there was something left unsaid. "But that doesn't mean I hate being with you, Frisk!"

Toriel and Asriel have a little talk about the Surface.

"Long ago, two races ruled over Earth: Humans and Monsters." One race feared for their strong souls, the other for their magic, and the mages caught between them feared for both. All silently knew that war would be inevitable. The only thing that mattered was surviving it. One crimson mage understands that well, and is determined to keep herself and those she cares for alive.

At the end of the war, monsters don't have the choice : they have to join Mont Ebott for survive another day. Sans and Papyrus, forced to run away after the attack of their village, are delivered to the horror of the war without any help and this one objective. But as sons of the royal scientist, W.D Gaster, they are an easy target. Both of them start a dangerous journey.

Welcome to my diary! Written by me! THE AMAZING PAPYRUS! Read my totally cool adventures!

When Martlet goes to quit the Royal Guard, she gets a weird sense of deja-vu.

Littleverse: a multiverse in which most, if not all, of the main characters are children. Small children. Some of which have never had parents to guide them. FMD Ink: a psychopath. What will happen when these two forces meet? Well..a lot of adoption, fluff, and angst, apparently. We do not know how this happened. Go check out Clichély on AO3 and Wattpad!