A single choice has a huge impact. Not just on one person's life, but on everyone around them. In the Underground, there are many paths one can take. But when Frisk makes a choice that takes them off all the known paths, the world is changed forever, and Frisk becomes intrinsic to the fate of not just Monsters, but the whole world.

In this universe, the timeline is messed up, no one is nice anymore, and they hate humans. But...is the pacifist route really impossible in such a place? Come in if you want to find out

After the barrier is broken and all the Monsters are freed, Flowey finds himself alone in solitude once more. With no Frisk, no friends, no hope of returning to his former self, he languishes in despair. That is... until he meets a new friend. (In Progress) (Post-Pacifist / Warning: OC!)

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

everyone is free, everyone is saved. but what happens when a new soul/soul trait is created to replace frisk's old one, the soul of trust what will happen now?

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.

This is an AI story about Undertale. Almost every text is generated by this, but some of them are modified by me, to make the story have more sense or better format. This may contain weird ships, I'm not sure.

Waking up in a basement surrounded by skeletons that you find extremely familiar is freaky especially when you know you shouldn't be there... ... why do you feel like you're in a fanfiction book right now? (trashy intro)

Parfois Frisk a juste besoin de se rassurer que le garde-manger sera toujours plein. Toriel comprend. (traduction de fanfic)

After Chara is freed from the Void, reunited with her friend, Gaster, and gone through a Reset of time, she must now help guide young Frisk through the Underground, showing her to get by without harming anyone. (Female Adult Chara, Female Frisk)

Chara est morte pour la deuxième fois avec Asriel dans le jardin. Mais ensuite elle se réveille à nouveau, pas dans le jardin, mais dans les Ruines, couchée sur une parcelle de fleurs. Mais où est Asriel? Et qui est la fille inconsciente à côté d'elle? (traduction de fanfic)

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!

The monsters never ended up in the Underground, thanks to a person who was half-human, half-monster. She and Sans keep watch for those foolish enough to enter the magical forest surrounding Mt. Ebbot. What happens when Frisk and Chara enter those same woods?

"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

Monsters surfaced to find themselves in a highly respectable world of governance through cults dedicated to the task. Sans the skeleton has them pet-sit a rock.

[Horrortale AU] After their fight against Omega Flowey, Frisk left the Underground to get help and save their friends. Unfortunately, humans are not as comprehensive as monterkind and they didn't believe them. How to change their mind ? In the Underground, the situation is getting worse. Toriel and Undyne are fighting for the throne, and chaos is taking place in the Kingdom.

[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.

Sans tells the human about his brother. Too bad the human gathers Papyrus is dangerous, from his warning. Oneshot

Rodrigo, who just began playing Undertale for the very first time, has to find out which way is best as he ends up in the actual Underground. But when a Fallen Child's soul inhabiting Rodrigo's body tries to drive him to violence, will someone help guide him down the right path? Contains spanking, and minor mention of death, you don't have to read if you don't like that.

Cheyenne et sa petite sœur, Neelam, prennent leur indépendance après quinze années passées en famille d'accueil. La plus âgée ne réussissant pas à trouver un travail, Papyrus, leur charmant voisin, lui propose de surveiller son frère, Sans, atteint d'une maladie qui lui fait perdre peu à peu la mémoire. Un travail en apparence facile qui pourrait bien être plus trompeur que prévu.

This is just some fluff with the pairing Charisk (Chara x frisk) Rated T for safety.

Will contain lemon and the like, M rated. After a wet dream, Cherry Red awakes to find herself in the beginning of Undertale! But this time, all the characters are female! But with a very problematic issue involving her being a hermaphrodite, Cherry needs to get through the Underground in one piece... and hopefully not get killed or get fucked in the process. Keep it in your pants!

In which Chara Dreemurr sacrifices herself to save the monsters from extinction.

When Dr. Alphys decides to send letters for her Slumber Party, she couldn't wait for all of her friends to Come! But when she was about to give up... A Certain Fish decides to join the Fun.

Light and dark. Positivity and negativity. The latter keeps swarming, and threatens to consume everything. And only the heroes shining with the light of HOPE may vanquish the assailants, bringing peace and balance back to this world and those surrounding it. The Multiverse is vast and wide, infinite and strange. If peace cannot be achieved... Everything shall perish.