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.)

Chara has fallen into the Underground and Gaster has found a way out of the Underground and expects The King and Queen to do what it takes to leave but he does not expect what The King and Queen will really do nor does he know The Human's arrival. Come and experience how Chara grows into their new home and how Gaster will try to ruin it. (Rated K plus for now may change to Teen.)

Looking for closure after finishing the game you write a letter to the characters. You never expected a reply.

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.

This is my full AU on Killer Sans. Let me know if you want info of other Sans's or any other Undertale Character! Please note that this is MY AU not canon Killer Sans. My Killer DOES have some canon facts on him though!

And so it began. The SOUL that longed to rest on a bed of buttercups, under the sun Would do the last Fallen a favor, by ending their life as an offering To the ancient magic that locked Monsters on the Underground Charisk Tales - Part I of IV

"Third time is a charm", or so one would say. After their attempt at building Chara's SOUL, Frisk gave up life once more. Floating, guiding their own beloved in what should be a peaceful journey in the Underground. One last time, to SAVE them all. Charisk Tales - Part III out of IV

Eran las primeras vacaciones que se tomaba. Sans pensó que serian relativamente tranquilas, claro, si se ignoraba los gritos de su hermano, Papyrus, y el enamoramiento de este con Frisk; la molesta y deportista Undyne, intentando que se levantase del sofá y moviese el esqueleto; además de la familia Dreemurr, conocia a Toriel, pero sus hijos eran otra cosa. [Chara x Sans] [Chans]

Ever wonder why the legend says, "Those who climb the mountain never return?" This is our tale, the tale of the mages.

Three times below the Surface. It took them three lives to honor their promise. A childish, innocent vow to the one they know and love, to friends, to a newfound family. They know they will be missed, but they cannot go back to the living world At least, not for now. Charisk Tales - Part IV (Final)

Undertale characters react to Man on the Internet's Musical. When something more sinister comes to their attention, what will they do? I do not own Undertale or Undertale the Musical.

Frisk had been pushed into a corner, he was blinded and was chased for a long time, it wasn't supposed to be like this! he was a prodigy that this Era of war needed. Alas, jealousy had killed one of humanity's hopes, Or has it?

The timeline was reset after a Merciless Run. As far as the monsters underground knew, it was just another ordinary day. But beings that no longer existed knew better. The key to either saving or destroying the world in its current state... is Alphys. (Contains elements of the Underswap AU's general concept and the Othertale animation.)

(My own Underfell Take.) A lone human child falls into an underground world out for their blood... and their SOUL. With no friends except for a beaten-up flower, will the child be able to maintain their staunch pacifism? Or will they be forced to accept the motto of their new environment: "Kill or be killed"? (Rated T, just in case.)

Even after the barrier fell and the starved monsters found help and acceptance into the human community, Sans struggles to move on. But maybe things can get better. Even if all you can offer is steadiness and patience. Still, monsters are weird. You can see OC as any gender if you prefer. Kind with perhaps a patient soul. Warnings for panic attacks, PTSD, psychosis, injury.

I left my village to pursue science and magic. I left my village to see a better life than that of my own. I see the cities, I see the new technologies. Cars, lights, electricity. I see it all. And now, just a few weeks into my new life here in this big city, I wake up again living in my objective poverty. Now I must wake up again, to see more of this beautiful world.

Chara gets an uninvited, though not unwelcome, guest.

The barrier is broken. Monsters are free. Take a deep breath, because between securing monster rights, integrating into a new society, and reviving the lost art of magic there's a lot to worry about. Meanwhile Frisk and their ghost friend Chara realize exactly what is needed to revive Asriel: no less than seven human souls, all given willingly. Sequel to How to Save a Soul.

Papyrus, despite common belief, notices things. Especially things pertaining to people. Especially-especially things pertaining to the ups and downs of his brother's well-being... even when Sans would prefer he not notice these things.

What if you didn't destroy the reset button, but rather the menu? How does the world work when you cease to exist? What story will it piece together then? Hateful Glitch explores that question with a new set of characters and enemies alongside some well know past characters who are...A little different. Second Story.

It's been a good many years since Frisk freed the monsters from the underground. She is beginning High School and adjusting to life on the surface with her family. Things are going great until a new kid appears in her class. Arin, a loner, trouble magnet, compulsive liar who doesn't seem to have any friends. What will happen when a dark secret from the past rears its ugly head?

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.

It's been one year since Mettaton adopted Luna and the celebrity robot wants to make the anniversary of his daughter's adoption a special day. Done as a request for paradise dazzleshine. :)

Undyne and Asgore reminisce about the past a bit and the fish woman reflects on how much Asgore is like a father to her. Done as a request for The gay geisha. :)

A human falls into the Underground, and quickly realises that everyone there is either drunk, stoned, or completely off their face. Will they succumb to the temptations of the Underground or stay sober? [Contains a lot of drug use, swearing and graphic depictions of violence] {cover image by u/ipoststupidthings on Reddit)