Frisk wants to make someone's birthday special, even if that said someone doesn't want anything to do with them at all, or anyone for that matter.

Sans has always had a second home at Grillby's, but will that change when a mysterious human sends Sans over the edge? Just who is this guy, anyway?

Monsters are made of magic. Humans are filled with Determination. Giving magic to a human... can have unintended consequences. Whether they want to or not, they will stay determined. (Chara-focused.)

It's all the Au sans X the beautiful reader chan!

Sans and Papyrus are invited to Muffet's picnic, but neither of the two expected the spider girl to be so gassy.

When Frisk runs away from the orphanage, his older sister Jett has to go find him in Mt. Ebott's forest and instead finds herself trapped in the Underground where she is introduced to her soul. Jett soon discovers that she holds a great amount of power and quickly finds out that there are certain Monsters in the Underground that want that power for themselves. (OCxSans)

Compte rendu : Création d'une âme artificielle parfaite grâce au composé chimique ordinairement humain. Résultat : un échec partiel et une réussite complète. (Dernière entrée ajoutée le 28 Octobre 2018 : ENTREE 11)

Papyrus finds an invitation letter addressed to Sans in his overcrowded mailbox.

Seven days out of the underground.

A new timeline, a new creature comes to the underground. Something no one knew existed. The appearance of this creature changes everything. Dark secrets about humanity come to light. Once the barrier is broken...will the monsters even want to leave? Tragedy, horror, love, all combine. Mentions of torture and abuse. Papyrus/OC Sans/Frisk

A predictably self-indulgent ficlet collection feat. my fav UT beans. Charisk, Flowisk, Chariskriel, Flowiskra. (Marked complete but updated occasionally.)

Trapped in never ending resets, unhealthy co-dependency and the knowledge that the only guy who remembers hates them, Frisk and Chara are out of options. So in the minds of traumatised kids, suicide is the last option left. But suicide is a pretty memorable thing and emotions may be stronger than memories. Especially to the person who finds their dead body. (M for violence.)

Chara and Asriel make a new... friend? And that encounter becomes the catalyst for everything that follows.

Everyone knows the tragic tale of the R.M.S Titanic. How this largest ship in history sank on the night of April 14, 1912, where 1,500 people, of both humans and monsters, had lost their lives as the ship fell into the depths of the cold waters of the Atlantic. But no ones knows the story of how a wealthy first-class lady's life was changed after meeting a poor skeleton artist.

You were born with a strange and unusual gift: The ability to see monsters which madness has consume them. You were always told to never interact, never get near them. But when you inherit your grandfather's house an unexpected guest seems interested in you. What could possibly go wrong?

This story has nothing to do with the other Undertale series I'm doing, but both Frisk and Chara are still females, but Chara will be able to do things not possible before.

Sans leaned down over her attempted retreat, his golden canine glinting ominously in the wan light of the hooded lantern he had set outside her cage. He stopped an inch away from the side of her face, glowering and locking gazes with her in silence, before he finally spoke, shattering the void of noise between them as he did. "care to run that by me again, bitch?" Underfell AU

Aliza had always known she was meant for more than her grandmother's abuse, than her exclusion from society. It was only with the finding of Frisk's journal, and the climbing of the cursed mountain, that she truly came to know her purpose, though. The story of Axetale. Axetale AU

"you're right about my manners, officer… i do forget myself sometimes. but i'll have to take exception to the suit jibe. insulting a monster's clothes… that's just downright crass," Sans commented, straightening his cobalt blue tie; he gave her another up and down look, much longer and introspective. "'specially comin' from a woman in a tacky uniform." MobTale AU

A story following Papyrus and Sans as children and just prior to the game. Features older sibling Chara, older brother Asriel, and more.

Alphys has been avoiding Undyne. One-shot.

With a killer coming through the Underground, Undyne realizes that if she wants to confess, she needs to do it now. But perhaps she shouldn't have said anything at all...

Ten years after the events of Undertale, Frisk and Sans have a heart to heart. FemFrisk.

Everyone has a secret. But not all secrets can remain hidden forever. Sooner or later, the truth finds a way to reveal itself. The first ever installment in the Undertale: Chronicle AU.

After Frisk s death, Toriel gives Sans a strange letter. In that letter there s a final message to him from his precious sweetheart. What could be her last wish? Sans x Frisk. One-shot. AU (Flowerfell fic).