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  1. Tags
    Summary

    Once upon a time, a human fell into the Underground. Chara poisoned herself and her brother Asriel used her soul to cross the barrier. But, in the end, their plan failed and it took the lives of six more humans for the monsters to finally go free.

    ...But what if Chara survived, and the other humans fell to find a world that welcomed them? Perhaps freedom without bloodshed is a possibility after all.

    ~Updates on Fridays~

    Language:
    English
    Words:
    15,946
    Chapters:
    10/?
    Collections:
    1
    Comments:
    171
    Kudos:
    53
    Bookmarks:
    9
    Hits:
    927
  2. Tags
    Summary

    When Chara and Flowey find themselves in a familiar-unfamiliar Underground, where everyone’s happy, the air doesn’t taste like dust, the royal children are still alive, and the Royal Scientist is someone they’ve never even heard of before, they have no idea how to handle the strange world they’ve found themselves in or what happened to the one they know. Sans, on the other hand, knows exactly what he’s going to do.

    In which time travel is either going to save the day or end it, Chara is incredibly confused, Gaster is a worried dad, the Great Papyrus is very great, and Alphys is the stuttering voice of reason. Also, the past version of Sans gets to see just how much of a face-heel turn he ends up making, and it’s just business as usual for the future one.

    Set a little bit after Punchline in my Underfell timeline, but you shouldn’t have to read it first. (You totally should, though.)

    Series
    Language:
    English
    Words:
    29,979
    Chapters:
    8/?
    Comments:
    3
    Kudos:
    20
    Bookmarks:
    5
    Hits:
    312
  3. Tags
    Summary

    It's the same story on the surface as it has been for timeline after timeline; universe after universe. Well, maybe not the same as some: those unholy yet satisfying deviants in the norm, such as the universe dubbed 'Underswap'. This universe isn't exactly like the seed universe, either, which has surprisingly little information about it. Instead, this universe falls somewhere in the middle, where the main pack lies: on a world called Earth, and in a town called Ebott. There are humans, and the monsters, in the end, escape their prison and meet the humans. Sounds almost boring, right? Good. I haven't told you about her yet.

    Series
    Language:
    English
    Words:
    6,633
    Chapters:
    5/?
    Kudos:
    10
    Bookmarks:
    1
    Hits:
    92
  4. Tags
    Summary

    You never really know when you'll run into someone who makes your life really worth living...

    A second chance can be a rarity, but you may as well make the most of it.
    Love can take the form of many things, changing your development as a person in different ways. He may not have skin or organs, but you've managed to steal his heart.

    (Inspired by Overgrowth as well as some other fictions depicting alternate universes and endings)

    Language:
    English
    Words:
    743
    Chapters:
    1/?
    Kudos:
    4
    Hits:
    27
  5. Tags
    Summary

    Just when things are finally starting off, Sans and Frisk realize their troubles with Chara are far from over...

    Language:
    English
    Words:
    14,292
    Chapters:
    7/?
  6. Tags
    Summary

    "You will find the fallen children, and bring them home to me."

    ~

    Lost deep within the realm of Monsters, Integrity has forgotten everything: their past, their power, their name.
    They only know that they have one goal, but cannot remember how or why.

    They know that true names hold power, but are they truly powerless if they cannot remember their own?

    The memories once hidden in a cloak of darkness are slowly but surely revealed.
    Integrity finds their identity directly opposes the very virtues and morals that their Soul upholds.
    After discovering one's true self, they have to deal with the consequences.

    ~

    Will you kill for your own freedom, or die to save them all?

    Despite seeming so impossible, perhaps there is a third option.

    Language:
    English
    Words:
    16,052
    Chapters:
    5/?
    Comments:
    15
    Kudos:
    18
    Bookmarks:
    9
    Hits:
    294
  7. Tags
    Summary

    Can something smell golden?

    You wake up in a bed of flowers in the middle of a cave, without any clue how you got there or really anything else. All you know is that your legs hurt and you can't remember anything and there's a talking flower and you're getting serious deja vu.

    Language:
    English
    Words:
    11,226
    Chapters:
    5/?
    Comments:
    19
    Kudos:
    53
    Bookmarks:
    11
    Hits:
    777
  8. Tags
    Summary

    It should go without saying by now that this is a species swap AU (alternate universe), but in case you're new to my work, I use my own human AU. Monsters are on the surface, humans are Underground. Humans still started the war, but they bit off more than they could chew and the monsters locked them down there with a magical barrier. Ya know, typical Undertale stuff, just flipped on its head a little. Our beloved characters from Undertale are now humans, Frisk, Chara, and the other fallen are monsters, obviously.

    Series
    Language:
    English
    Words:
    746
    Chapters:
    2/?
    Kudos:
    1
    Hits:
    12
  9. Tags
    Summary

    = = = > DAVE: Notice the Door opening behind you.

    What?

    The thing that you hear next is a small creak coming from the Door that you just so happen to be standing in front of, back to it so that you can watch all of your friends. Terezi is the first one to notice something, probably sniffing it out with that keen snout of hers, and before long Rose’s head snaps towards your direction too, eyes slowly widening as she let go of Kanaya’s hand, using it to latch onto one needlewand as the other raises to point.

    You think that she says something, maybe something along the lines of, “Behind you!” but you don’t get the chance to see it clearly. As your head turns, you catch a glimpse of a black mass there, one with a white face. You have no time to react. And even if you did, what the hell would you do? This is something from the universe that you all created- this is one of your creations, technically, and it’s apparently strong enough to open up this literal Door to the Void.

    You have no time to react as a skeletal hand clamps over your mouth and drags you back, through the Door.

    (Formerly known as Glitch Tale, Original AU by Homofrost on tumblr. Thanks for letting me do this!)

    Language:
    English
    Words:
    92,262
    Chapters:
    13/?
    Comments:
    185
    Kudos:
    847
    Bookmarks:
    117
    Hits:
    11867
  10. Tags
    Summary

    After his timeline was destroyed along with almost everyone in it, the Sans who would come to be known as ‘Blue’ had an epiphany.

    Everything sucked. Like, all the time.

    It was not, perhaps, a new discovery, but it was the first time he had admitted it to himself. He had always tried to keep a positive attitude in life, even if his recent circumstances had put a sizable dent in his motivation.

    But still, he wouldn’t give up! As long as there were still monsters out there who could use his help, Blue would never give up.

    And so, stuck traveling the multiverse with a child and stuffed toy that were doing their best to kill him at every turn, Blue attempted to help prevent other universes from meeting the same fate as his - and perhaps make some new friends along the way!

    After all, just because life is hell doesn’t mean that he shouldn’t be cheerful about it!

    (in which Underswap Sans survives a no-mercy timeline unlike any other, and ends up losing both his home and his ability to Be Chill™.)

    Language:
    English
    Words:
    9,700
    Chapters:
    8/60
    Comments:
    33
    Kudos:
    75
    Bookmarks:
    11
    Hits:
    541
  11. Tags
    Summary

    What would happen if the monsters were all shrunk down and teleported to an AU after they died in the original timeline? Get found by that universe's Chara of course! The trouble is Chara doesn't want them there and will go to great lengths to get rid of them. However will the tiny monsters warm her heart? Especially a certain goat boy....

    Series
    Language:
    English
    Words:
    1,901
    Chapters:
    4/?
    Kudos:
    8
    Hits:
    282
  12. Tags
    Summary

    The barrier's broken, monsterkind is finally free, and Dr. Gaster is reunited with his two wonderful sons. You'd think everything would be smooth sailing from here on out, but there's one little, teeny,tiny complication the skeleton family has to deal with: the consequences of one missing night after the worst week of Sans's entire life. Fortunately Sans has the support of his friends and family in these trying times. Now if only he could figure out who the father is.

    Language:
    English
    Words:
    11,907
    Chapters:
    6/10
    Comments:
    38
    Kudos:
    68
    Bookmarks:
    11
    Hits:
    700
  13. Tags
    Summary

    Long ago, monsters were banished from the surface and sealed underground. One day, a human found herself in the realm of the monsters and slaughtered those she met. However, she was spared on one condition: that she would break the barrier and help the monsters retake their lost surface.

    With the Happiness and Peace of Mind Committee at her side, Miku seems unstoppable. But for two unfortunate twins under her tyrannical rule, they face some hard decisions about what they stand for. Is it better to survive in a society where you can be executed at the drop of a hat, or to leave behind the only family you have left in the name of freedom?

    (Alternative summary: Miku mentions 'Undine' in a song and we ironically turned it into a crossover, before realising that it's actually kinda good? So now it's a thing...)

    Language:
    English
    Words:
    10,774
    Chapters:
    6/18
    Comments:
    2
    Kudos:
    5
    Hits:
    40
  14. Tags
    Summary

    The daily lives of the monsters after the clusterfucks of HOAG and OUYE.

     

    (Prays that a plot doesn't develop on it's own again.)

    Series
    Language:
    English
    Words:
    5,664
    Chapters:
    1/?
    Comments:
    4
    Kudos:
    2
    Bookmarks:
    1
    Hits:
    27
  15. Tags
    Summary

    The first step in accepting what's happened has been taken. The first of many, but the first one is done. Back among friends, back among family. Now to continue with life, now to continue without looking back!

    This calls for celebration!

    For one special human, that saved them all. However, first it has to made sure that everyone's invited, and that everyone wants to come.

    But why wouldn't they want?

    Series
    Language:
    English
    Words:
    68,410
    Chapters:
    19/?
    Comments:
    59
    Kudos:
    25
    Bookmarks:
    3
    Hits:
    654
  16. Tags
    Summary

    After a miracle, Chara and Asriel Dreemurr are revived a year after the events of Undertale. It's taken a while, but monster society's finally assimilated into humanity. There are ups and downs, but hey, nobody was expecting it to be perfect on the surface. But they have friends who accept them for who they are and allies that are yet to come into the light. It just makes everything much, much easier.

    A PostGame fanfic that makes zero sense.

    Language:
    English
    Words:
    182
    Chapters:
    1/?
    Kudos:
    2
    Hits:
    26
  17. Tags
    Summary

    You've been through shit you shouldn't have to anymore, so, in order to protect yourself, you've been separating yourself from the outside world little by little. Daydreaming, music, novels, fan fiction, video games keep you the most distracted. The last game you played was Undertale, you read a bit about its AUs. You end up inside one of those AUs, but can't remember how you got there. How does it affect you to be there? You're not the innocent and cute teenager that makes Sans or Papyrus fall in love with you, like most fan fiction stories depict. You're a woman, around her 30's, just divorced from an asshole that used you as a shared sex toy for about 10 years.

    Language:
    English
    Words:
    23,325
    Chapters:
    13/?
    Comments:
    15
    Kudos:
    70
    Bookmarks:
    12
    Hits:
    1369
  18. Tags
    Summary

    This is a human AU. Humans are trapped Underground, Frisk, Chara and the other fallen are monsters. Sans and Gaster aren't related, and Chara and Asriel are still alive.

    Sans is a young adult who needs a job, and Gaster is the one to give him one. At first, Sans comes off as lazy, uncaring, and unreliable, but soon the scientist learns that there is more to him than meets the eye.

    Meeting Arc - Chapter One - Thirteen
    Mourning Arc - Chapter Fourteen - Sixteen
    Development Arc - Chapter Seventeen - Thirty
    The Void - Chapter Thirty-One - Epilogue

    Series
    Language:
    English
    Words:
    83,933
    Chapters:
    38/38
    Comments:
    26
    Kudos:
    131
    Bookmarks:
    14
    Hits:
    2149
  19. Tags
    Summary

    This is a human AU. Humans are trapped Underground, and monsters are on the surface. Our beloved characters from Undertale who were monsters are humans in this AU, and the humans are now monsters.

    Sans. is a young adult who needs a job, and Gaster is the one to give it to him. The Royal Scientist has no idea why he hires someone so under qualified to help him run a science facility, but nonetheless, Sans now works under him as his assistant. He has no plans to become friends with Sans whatsoever; but, fate doesn't care about plans.

    THIS IS A REWRITE!! If you're new to my writing, I highly suggest you read this instead of the old one, as it is, in my opinion, put together much more coherently. If you're not new, well, I've been told by a couple of you that you reread the original several times, so I highly doubt you have any issue with reading this rewrite.

    Either way, with all that said, please enjoy.

    Language:
    English
    Words:
    1,694
    Chapters:
    1/?
    Kudos:
    1
    Hits:
    6
  20. Tags
    Summary

    Frisk and Sans suffer from SOUL sickness.

    Language:
    English
    Words:
    9,464
    Chapters:
    5/?
    Kudos:
    20
    Bookmarks:
    3
    Hits:
    295

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