1 - 20 of 3901 Works in Alternate Universe - Underfell (Undertale)

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  1. Tags
    Summary

    What happens when you combine a depressed mess in an abusive relationship with a mix of overprotective and semi emotionally constipated skeletons. Fun times, let me tell y'all.

    Language:
    English
    Words:
    3,885
    Chapters:
    1/?
    Comments:
    1
    Kudos:
    1
    Bookmarks:
    1
    Hits:
    9
  2. Tags
    Summary

    You've worked with difficult people before, but...these skeletons were on a whole other level. If Undyne had warned you just how crazy they were, you probably wouldn't have agreed to help the queen in the first place.

    But due to unfortunate circumstances, Mt. Ebott was the safest place for you to be. And in order to stay, you had to join the Royal Guard.

    Now, with threats of war breaking out, you find yourself torn on whether or not you should help this mixed bag of good and evil monsters.

    But one thing was for sure...you'd sooner die than give up your newfound refuge. You were ready to fight and protect your home.

    And these skeletons didn't seem to understand that you were serious.

     

    An Undertale Reverse Harem Story.
    This fanfic is a fem reader insert.
    NOOO SMUT OR LEMON, just an emotional rollercoaster :)

    Language:
    English
    Words:
    3,306
    Chapters:
    2/?
    Comments:
    2
    Kudos:
    15
    Bookmarks:
    4
    Hits:
    102
  3. Tags
    Summary

    Hello there Reader! Your name is Dee! And you have just moved back to your hometown of Ebott! Though after 17 years it sure looks different! As you return to your beloved hometown, now a capable 24 year old human being, you can't seem to shake the chill of your past and the effects it's having on your mental state. Oh! But maybe those nice skeleton monsters can help chase away these pesky memories.

    *Reader is an AFAB She/Them. Not your cup of tea then move on. :)

    **Updates are ever Friday or Sunday at 5PM EST!

    Language:
    English
    Words:
    91,833
    Chapters:
    23/?
    Comments:
    107
    Kudos:
    130
    Bookmarks:
    43
    Hits:
    4701
  4. Tags
    Summary

    The King of Hell is dead. The Barrier is Broken. This is where most stories would end. A triumphant period marking a long, heart wrenching sentence. However, one story’s ending is another’s beginning. Frisk, a woman who’s survived everything life had to throw at her, is about to embark on a brand new journey as not only a savior to monsterkind, but also their ambassador to the very humans who had locked them underground in the first place. A daunting task, indeed.

    But she’s not alone, not this time. At her side stands Sans Gaster, her most trusted ally and more importantly, her devoted lover. Can their love withstand the trials the world has to throw at them? From the shadows of their past come back to haunt them to the rise of hatred and the fear of Hell on Earth? After months of asking “What Do You Want?” one can only hope that the answer will forever be “You.”

    Series
    Language:
    English
    Words:
    72,575
    Chapters:
    12/80
    Comments:
    59
    Kudos:
    41
    Bookmarks:
    11
    Hits:
    1235
  5. Tags
    Summary

    Waking up as a skeleton surrounded by more skeletons - all of whom you have no idea who they are- is definitely not your cup of tea. Even more unpleasant, the person whose body you stole is still inside and now your stuck with a very unhappy human-hating skeleton! Yikes, sucks to be you...

    Language:
    English
    Words:
    22,001
    Chapters:
    8/?
    Comments:
    44
    Kudos:
    311
    Bookmarks:
    59
    Hits:
    3143
  6. Tags
    Summary

    inspired by a scene in my head about a crazy Bitty-Bones, which grows into a story of craziness and bizarre happenings.

    What happens when you suddenly get a wild idea and adopt three different Bitties? This is a story of just that; of how a single decision can spark an epic tale of adoration, love, soulmates, heart-break and multi-dimensional happenings. At the heart of it all stands a pack of Bitties and their Angel-Cake/Goddess/Lady.

    Language:
    English
    Words:
    64,253
    Chapters:
    19/?
    Comments:
    115
    Kudos:
    366
    Bookmarks:
    69
    Hits:
    9130
  7. Tags
    Summary

    Once every two hundred years, the King of the Monster Kingdom makes an offer too all of the surrounding kingdoms. The strongest warriors shall fight for his entertainment and the winner wins a chance to court one of his many sons.

    Though every single time everyone dies. No-one has ever been able to court a single prince. Though it's not overly surprising, everyone would fight to the death for an omega's hand. Especially from one of the most powerful families in the world.

    To the Kings surprise I lived. Now I have my pick of who I shall take as my husband. Though most of them seem rather interested at the prospect.

    Language:
    English
    Words:
    7,405
    Chapters:
    3/?
    Comments:
    54
    Kudos:
    170
    Bookmarks:
    28
    Hits:
    1036
  8. Tags
    Summary

    "Have you seen this girl? If so please call your local police department immediately for accounts of murder, trespassing and evasion. In other news monsters have been released from what appears to be underground, are they friends or foes"? ....

    Life wasn't always this hard. It used to be quite simple really, go to school, learn nothing, come home, eat, sleep and repeat. That all changed when the monsters were set free. No one even remembered they were real and yet here they are trying to make peace in a world that fights against its self. Where do I fall into all this? The government isn't happy that monsters are on the surface and are trying everything to put them back where they supposedly belong. For that they need magic but humans have forgotten magic for quite some time now so finding out whos got the genes is kinda hard. They followed the lineages of all seven mages that performed the spell before but hit dead ends, literally, until they found mine. The last hope of saving world domination or destroying it. Monsters aren't clueless either they know what the government is trying to do and they want to stop it at all costs. So where does that leave me?

    Language:
    English
    Words:
    2,856
    Chapters:
    2/?
    Kudos:
    1
    Bookmarks:
    1
    Hits:
    32
  9. Tags
    Summary

    You work in an account firm, have plenty of space and love your job. The only problem? Your lonely. What better way to fix that then getting some tiny housemates?

    Language:
    English
    Words:
    12,824
    Chapters:
    12/?
    Comments:
    21
    Kudos:
    32
    Bookmarks:
    8
    Hits:
    364
  10. Tags
    Summary

    You have recently moved into Ebbot city, where monsters and humans live together. Fortunately for you, mobsters and racist humans roam the streets and missing reports are common. It's the perfect place for you to blend in.

    Poor you is jobless here, but you end up finding a pair of mobster brothers in need of staff. How were you going to convince them that you, the ‘human’ woman, was strong enough to be a bodyguard?

    You can't wait to blow them away.

    I forgot to mention that you are a blood sucking vampire by the way.

    Language:
    English
    Words:
    5,154
    Chapters:
    5/?
    Comments:
    3
    Kudos:
    32
    Bookmarks:
    7
    Hits:
    247
  11. Tags
    Summary

    You just moved away from home and into your very own apartment! What will you do with your newfound freedom? Get a pet of course! Or at least that was the plan before you ended up taking in two bitties instead. They're guarded from living less than ideal lives and you don't feel like the right person to be helping them, but you will if you must (at least until you can find them a proper home). Will you hand them over to someone more capable or will you get so attached that you become that capable person yourself?

    Series
    Language:
    English
    Words:
    15,301
    Chapters:
    12/?
    Collections:
    1
    Comments:
    46
    Kudos:
    122
    Bookmarks:
    35
    Hits:
    1785
  12. Tags
    Summary

    A short smutty one-shot about a pissed-off reader decides he has had enough of sans' (underfell) shit and gets with a girl (an original character) in a club, only for sans (underfell) to walk in and angry, public sex ensues.

    Language:
    English
    Words:
    1,418
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    36
    Hits:
    196
  13. Tags
    Summary

    You've fought for years for people who hate and humiliate you, see you as more of a nuisance than a hero. A menace to society, just like your mentor. But you keep going, keep fighting. Keep pushing your limits to save innocent's who get tangled in the cruel web of life that you walk as a shadow. As someone who expects nothing but gives their all.

    But you keep going You'll deal with whatever and whoever threatens the lives and safety of innocents (both monsters and humans) because you are a spider. And spiders will never go down without a fight.

    Tired and injured you go to deal with one of your greatest enemies, a skeleton who like you loves puns but is dangerous. More so than anyone could ever imagine. But instead of wrapping the night up quickly like you want you're faced with something neither of you can understand. A machine that goes haywire leaving you injured and in the mercy of the two skeleton brother's and their clones

    But you won't back down. You will fight even if your hope isn't what it used to be. Maybe this 'other mansion' of skeletons will finally break the walls you were forced to put up in order to survive. Maybe, just maybe-

    You'll finally realise how amazing you are

    Language:
    English
    Words:
    39,736
    Chapters:
    9/?
    Comments:
    145
    Kudos:
    330
    Bookmarks:
    87
    Hits:
    4476
  14. Tags
    Summary

    I fell down into Snowdin after losing my way in the woods. It's all well and good that nothing can hurt me, but now I'm trapped down here. I have to figure out how to survive. My neighbors across the way, the skeletons, have been acting weird the last couple of weeks. It's not my problem because I have to haul garbage to fix my life.

    Language:
    English
    Words:
    16,793
    Chapters:
    7/?
    Comments:
    15
    Kudos:
    93
    Bookmarks:
    20
    Hits:
    997
  15. Tags
    Summary

    Unknowns Sans and papyrus of my au Vanquished-tale with their out-code Papyrus?Sans? Friend, Into a Au Where a machine has brought many alternate versions of them to an alpha timeline! Will all of them be able to go home? Will the people in that house learn what the outcode and Vanquished-tale brothers have gone threw? Will the unsettling feeling in Vanquished-tale papyrus go away?

    Language:
    English
    Words:
    7,561
    Chapters:
    1/100
    Comments:
    2
    Kudos:
    6
    Bookmarks:
    4
    Hits:
    92
  16. Tags
    Summary

    When Monsters emerged from Underground they were met with kindness for the most part. But somehow after over a century humans have become pets to Monsters.

    You hate this. You know that humans and Monsters used to live together as equals. But now you have to live as a pet. Luckily you escaped a shelter and had lived on the streets for months. On your search for food you come across a skeleton and by the looks of it he's about to get mugged.

    Maybe if you save him he'll get you some food. Turns out he had other plans.

    Language:
    English
    Words:
    3,288
    Chapters:
    1/?
    Comments:
    4
    Kudos:
    43
    Bookmarks:
    13
    Hits:
    377
  17. Tags
    Summary

    Your life was terrible. Terrible working conditions. Terrible fiancé. Terrible relationship with any and all people around you. The only good thing that happened to you was getting struck by lightening and waking up in a house full of skeletons.

    Okay. Maybe not quite a good thing to happen now that you think about it.

    Language:
    English
    Words:
    8,195
    Chapters:
    2/?
    Comments:
    30
    Kudos:
    80
    Bookmarks:
    16
    Hits:
    767
  18. Tags
    Summary

    Your life was put on hold for longer than you would have liked.

    Much longer.

    Not that it really bothered you. If you had your way you’d be more than happy barely skating by, locked away in your apartment, and sinking your days into video games.

    The gas leak on your floor had other plans. Your apartment exploded. A huge fiery ball of destruction, though fortunately not death, laid waste to everything precious to you. Every console, every collector's edition, every level grinded, gone, in one fell swoop.

    As if by fate, only a week later, you were offered a job homeschooling the now teenaged monster ambassador, Frisk Dreemurr. Room and board were included in your pay, you could finally put your degree in education to use, and most importantly, you were sure royalty had the fastest Wi-Fi money could buy.

    The very extensive non-disclosure agreement their lawyer had you sign raised a few red flags, but you had more than a lifetime of experience ignoring them.

    Whatever happened, happened. You were just excited to see what it’d be.

    Language:
    English
    Words:
    9,785
    Chapters:
    3/?
    Comments:
    8
    Kudos:
    55
    Bookmarks:
    8
    Hits:
    430
  19. Tags
    Summary

    You didn't have any grand dreams, and no burning quests for revenge that some of the other Human Stock seem to cling to. You just wanted to live the rest of your life in some form of peace, none of this back and forth between the Institution and Monster Households.

    And then you get chosen for a task no other Human has survived, and you can't help but think, what if this is my chance?

    [Look, Author wants a Grillby Harem, Author will get a Grillby Harem]

    Language:
    English
    Words:
    22,465
    Chapters:
    16/?
    Comments:
    211
    Kudos:
    910
    Bookmarks:
    168
    Hits:
    12033
  20. Tags
    Summary

    Set after the events of MyTale. The multiverse holds limitless possibilities, and multiple chances to do things over. Maybe struggling to do things right will build the path toward redemption? Or at least give some closure to a guilty and troubled mind.
    Multiple fourth-wall breaks. Self-insert as Frisk. Some suggestive stuff here and there, but no romance that's out of canon. Can be read as a stand-alone if you don't mind spoilers.

    Series
    Language:
    English
    Words:
    33,603
    Chapters:
    6/26
    Comments:
    9
    Kudos:
    4
    Bookmarks:
    2
    Hits:
    129

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