Before the events of Underverse begin, seven people disappear from their Multiverse. Dream, Error, Fresh, Stretch, Outer, Core!Frisk and Cross!Chara are trapped in a new world that they can't leave until they watch everything they're given. They get one chance and have to choose carefully what they change, for better or worse...

What would you rather see? A skeleton and a human talking about magic? A king thinking over his decision on if he should let humans live underground? A flower who's hellbent on killing everyone and everything? Or perhaps a young aspiring guard working their patrols diligently. The side stories of their lives, chosen by our readers, reside here. Sequel to Two Worlds, Two Souls.

In a pacifist timeline, where Frisk is pretending to care about the monsters, Frisk goes home and exposes all the monsters' crimes. This has drastic consequences, especially for Sans.

What if two humans were in the Underground at once? What if one human was DETERMINED to stop the other? What if they could both SAVE? What happens when an Unstoppable Force meets an Immovable Object? When a certain scientist pulls enough of himself together, he finally finds a way to stop the destruction of his world. (Undertale AU. Rewrite of DT.)

"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

Mi nacimiento fue la causa de aquella ruptura, la traición infligida la hizo más grande. Los universos alternos colapsan. El tiempo termina, los seres inmortales mueren. El destino se ha sellado. El equilibrio esta roto. ¿Qué es lo que debería hacer? Ser el sacrificio, eso es obvio. Y sin embargo, "El destino es un hijo de puta." Murmuré, mientras trataba de seguir cuerdo. [Yaoi]

An informational guide to the traits, powers, and anatomy of human souls.

A shooting star has landed on Mount Targon, the tallest mountain on earth, rumors say that whoever gains the power of the star will gain unlimited power. Competitions were held every year at the foot of Mount Targon. This year is the year Sans and Papyrus officially participate in the race. Will they rise to the top or will they fall down to their death?

Twenty-one iterations of W.D. Gaster gambled on plucking a human from beyond their reality to stop a vicious cycle of genocide, and changed the multiverse forever. In a scrambled timeline, away from the grand tragedy of The Angel & The Anarchist, a young woman awakens on a bed of flowers in her pajamas...

Hace años que los monstruos han salido a la superficie gracias a Frisk, que se ha sacrificado por la libertad de ellos. Pero a pesar del tiempo Sans no puede superar su duelo. Una día simplemente desaparece alertando a sus amigos, sobre todo a su hermano, que comienzan su búsqueda con un muy mal presentimiento.

After Chara accidentally walks into their best friend undressing whilst searching for something which was theirs, they realize that they do not feel the same way about them as they used to when they were children. Things escalate from here and they both share a night they will never forget. Neither the first time they will experience it... Nor the tenth. (Charisk lemon)

Genocide. Last corridor. Frisk with a knife in his hands, and on the contrary stands Sans. Everything is as always, but according to the law of meanness, everything did not go according to the standard development of events...

Just a short Undertale fanfic story. This story was written by a A.I chat system that someone told me about!

The adopted daughter of the King and Queen of monsters, a young girl who can't handle humanity, both abandoned the civilizations of their birth species, lived a century apart, now they must work together to free the Underground and allow the monsters to see the sunlight once more. But will they be able to succeed, or will a certain flower stop them? Time will tell. Charisk.

Luna has heard a lot about Grillby, but hasn't met him yet. Mettaton decides it's time for his daughter to meet the fire elemental who is her uncle. Done as a request for paradise dazzleshine. :)

Solo era café. Su hermano le habia pedido traerle esa taza de la cafetería que tanto le había atraído durante esos días, sin embargo, termino conociendo al Comediante. Como decía su hermano, "La vida comienza despues del café" [Sans x Chara] [Chans] - Actualización 14/02/2023, Especial San Valentin

The story right after Undertale.

Break of day, the dawn is here, Anny's up and pacing. Compromise or persevere, his mind is racing. Seems like two romantically inept dorks can't confess their obvious as fuck feelings for each other What happens when they can't bottle them up no longer? Doubletale belongs to XWolf26 and Mako belongs to XRabbit

Two essences in one body, it was never meant to last. Two weeks after monsters' freedom, the unlikely cohabitation between Frisk and Chara within one body starts breaking down. Frisk's body pays the price while both of their consciousnesses slowly start blending together. As they become a kind of human amalgamate, the two begin losing themselves more and more with each passing day.

Frisk is coming home after having been gone for a week. Papyrus can't wait to have her in his arms again. Just a fluffy little oneshot I wrote a while back and finally decided to post. Based on the Tumblr prompt "Reunion Hug."

The Rescue Arc continues with more suspense!

Tell me my friend. A story as my eyes fall, one last story of how it ends, how it begins... and once its over let my eyes fall peacefully, and then when we meet again you can tell me everything new. "Well... it all began with a tear."

Papyrus and his wife are watching stars.

A story about Katie and how she will trying to find Frisk and help her

Sans' threat may have not caused any problems with Frisk, but the human in front of him when he makes his threat isn't Frisk. Sans' threat caused a seemingly pacifist to reset into a genocidal timeline.