1 - 20 of 2692 Works in Alternate Universe - Underswap (Undertale)

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  1. Tags
    Summary

    Oneshots based on thedeerus' Swap AU. Please go check it out, their art is great!

    Series
    Language:
    English
    Words:
    8,767
    Chapters:
    8/8
    Comments:
    21
    Kudos:
    140
    Bookmarks:
    9
    Hits:
    1636
  2. Tags
    Summary

    Undertale one-shots that demand I write them. Sans/papyrus x reader centric. I take requests.

    Series
    Language:
    English
    Words:
    20,516
    Chapters:
    52/?
    Comments:
    160
    Kudos:
    325
    Bookmarks:
    36
    Hits:
    7918
  3. Tags
    Summary

    A collection of inane nonsense (ranging from Error being reincarnated as Palette to Dust finding a new love for the color pink) circling around the many AUs and Multiverses of the Undertale world. Some stories will be connected; Others will be random one-shots.

    Stop by and see what treasures, or horrors, you can find.

    Series
    Language:
    English
    Words:
    102,768
    Chapters:
    103/?
    Comments:
    1430
    Kudos:
    747
    Bookmarks:
    70
    Hits:
    19286
  4. Tags
    Summary

    Plot device is convenient, and the Human always causes mischief. Thanks to said mischief, the skeletons are introduced to entirely new world, one that is both adorable and disturbing all at once.

    Bitties may be simliar to other verisons of Bitties but they are not all exactly the same.

    A continuation of Light Drizzles introducing the Bitty Universe, turning out to be so massive it needed it’s own separate story dedicated to it. It is recommended you read Light Drizzles before reading this, but of course you don’t have to. There are some context stuff and events from the first story that are referenced to here.

    Featuring lots of Bitty artwork in most of the chapters!

    Master Name Key at the Bottom!

    Series
    Language:
    English
    Words:
    85,766
    Chapters:
    20/?
    Comments:
    48
    Kudos:
    16
    Bookmarks:
    2
    Hits:
    659
  5. Tags
    Summary

    The first time you met monsters you manage to run into four of them and literally run into one of those four. Now they are apparently moving in next door with their siblings and you can't seem to imagine a life without monsters. On the plus side they tell horrible jokes and have endless amounts of energy. So what could possibly go wrong.

    Language:
    English
    Words:
    253,940
    Chapters:
    64/?
    Comments:
    1786
    Kudos:
    3726
    Bookmarks:
    573
    Hits:
    95924
  6. Tags
    Summary

    Sans and Papyrus were your best friends until randomly they just cut off all contact with you. This went for everyone else in your life so it didn't really hurt that much when they did.

    The only question is why they didn't do it sooner.

    So after two years of loneliness, what was originally a drop off turned into a hospital trip, a broken leg, and your once best friends now homeless.

    What should be happening is them owing you a thanks for rescuing their so called, "Cousins" from a fire.

    Yet here you are offering them a place to stay, at your big ass mansion for the next eight months.

    So now you live with the people who abandoned you, along with their so called "family" who by the way don't really like you because you're a mage, but it's barely relevant to the plot so -

    What could possibly go wrong?

    Language:
    English
    Words:
    32,926
    Chapters:
    4/?
    Comments:
    28
    Kudos:
    177
    Bookmarks:
    52
    Hits:
    1790
  7. Tags
    Summary

    It was over, the multiverse was collapsing, everyone was dying and there was nothing anyone could do about it, there was nothing he could do, and it frustrated Ink. After struggling so hard to keep the creators interested, to motivate them and give them a story that was worth their attention, they abandoned him. Ink didn't know how to feel. But it would all be over soon, and soon it would stop mattering altogether.

    Until something strange happened.

    What would you do if you had the opportunity to do it all over again? To improve and change? Or simply being in control?

    That's what Ink is very, very interested in finding out.

    Language:
    English
    Words:
    8,153
    Chapters:
    5/?
    Comments:
    14
    Kudos:
    37
    Bookmarks:
    2
    Hits:
    336
  8. Tags
    Summary

    In order to summon a small version of your Soulmate you need few ingredients: Milk, a Love Bloom flower, a small fragment of your soul and a monster to perform the ritual.

    You wanted to feel less lonely in your apartment.

    You did not expect to find yourself with your hands so full.

    Language:
    English
    Words:
    9,217
    Chapters:
    8/?
    Comments:
    262
    Kudos:
    720
    Bookmarks:
    147
    Hits:
    7992
  9. Tags
    Summary

    You’re overworked and in need of some vacation time. This however was not what you had in mind. Buckle up buttercup, you’re in for one heck of a ride.

     

    Oh, why, hello there! And who might you be? Ah, the reader! Hahaha! How delightful! Will you be joining us on our little- V̷͔̞̹̊͆ả̷͈̫̃͜c̸̛͖͂a̸͈̾͝͝t̷̤̦͑̾̕i̷͖̝̦͛̃͠ỏ̷̻͆n̸̬͎̽͘? Oh, our destination? Yes, of course. You enjoy Undertale do you not? Never mind, no need to answer that. Of course you do. Silly question, my apologies. Well, we mustn’t dawdle, then, come along and enjoy your much deserved V̷͔̞̹̊͆ả̷͈̫̃͜c̸̛͖͂a̸͈̾͝͝t̷̤̦͑̾̕i̷͖̝̦͛̃͠ỏ̷̻͆n̸̬͎̽͘.

    Language:
    English
    Words:
    51,504
    Chapters:
    14/?
    Comments:
    164
    Kudos:
    157
    Bookmarks:
    39
    Hits:
    2310
  10. Tags
    Summary

    Paper Jam había tenido curiosidad por saber quien era su padre desde que Ink le explicó que, a diferencia de otros monstruos, él era fruto de dos papás

    Ahora, tratará de averiguar la identidad de este y saber que sucedió para que esto se separaran...

    ¿Como reaccionará ante la verdad?

    Language:
    Español
    Words:
    16,627
    Chapters:
    19/21
    Comments:
    1
    Kudos:
    35
    Bookmarks:
    6
    Hits:
    554
  11. Tags
    Summary

    Stand up comedy by the comics and their content is you

     

    Swapfell:
    In which Papyrus is gossiping about his brother and his brother’s datemate. Which makes you and Sans more popular than Papyrus and the two of you don’t have any idea he was doing stand up comedy that was being aired worldwide.

    Underfell:
    In which Sans loves to show you off and loves to talk about you to strangers. Now you’re wondering who the fuck are these strangers and why are they trying to follow your footsteps as if you’re an influencer.

    Underswap:
    In which Papyrus lowkey brags bff goals between the two of you. Also highkey brags about the relationship goals between you and Sans.

    Undertale
    In which Sans can rely on you with coming up the most stupidest and also the most brilliant ideas. But talking about you eventually makes his own audience gravitate towards your beautiful brain that creates these ideas.

    Fellswap
    In which Papyrus does mischievous things to everyone may it be man or monster. So the both of you team up to torment his brother which is your datemate

    Series
    Language:
    English
    Words:
    12,103
    Chapters:
    39/?
    Comments:
    161
    Kudos:
    413
    Bookmarks:
    60
    Hits:
    7898
  12. Tags
    Summary

    Red, Edge’s brother, had been hiding away in the lab recently, messing with some sort of machine that he didn’t seem eager to tell Edge about. Edge, obviously, didn’t plan on letting this slide. 

    After yet another day of Red blocking himself in, Edge decided that he would put a stop to it.

    By breaking the door down. And nagging him, not letting Red get a word in, as he stepped closer to inspect this machine that Red kept hidden.

    “WHAT EVEN IS THIS, ANYWAYS? WHAT MAKES IT SO IMPORTANT-”

    There was a click, a snap, and a whir.

    And then Edge was gone in a flash of light.

    Series
    Language:
    English
    Words:
    11,533
    Chapters:
    5/?
    Comments:
    21
    Kudos:
    30
    Bookmarks:
    2
    Hits:
    306
  13. Tags
    Summary

    Disoriented and emotionally frayed from decades spent in the void, W.D Gaster suddenly finds himself at the mercy of a cold and arrogant alternate self. His doppelganger promises to return him to the void once his research is complete but before he can make due on his threat, Gaster is introduced to this world’s variant of his son and he is forced to make a quick, spare of the moment decision.

    This sole act sends unforeseen ripples throughout the Multiverse and hurdles Gaster on a perilous journey across it to find his way home.

    or

    Dadster plays hopscotch across the multiverse, unintentionally and intentionally acquires children, tentatively reciprocates Grillby's feelings, engages in actual literal custody battles with copies of himself, somehow steals a Bad Sans™, narrowly avoids death at the hands of Error and somehow flies under Ink’s radar for a shocking amount of time.

    Language:
    English
    Words:
    5,686
    Chapters:
    1/?
    Comments:
    7
    Kudos:
    17
    Bookmarks:
    2
    Hits:
    72
  14. Tags
    Summary

    You're an afab trans non-binary man, who pays the bills by being a faceless "accountant" online.

    one day, you're supposed to meet friends for dinner and bump into a skeleton. little did you know the chaos that would unfold just by greeting one!

    well...at least you can say your biggest fans are definitely big...*wink*

     

    reader is a afro-latino non-binary trans man.

    Language:
    English
    Words:
    587
    Chapters:
    1/1
    Comments:
    3
    Kudos:
    14
    Bookmarks:
    3
    Hits:
    141
  15. Tags
    Summary

    Congratulations!!

    You're one of the 'Lucky' few to get your hands on a copy of Broken Souls! It's a once in a lifetime opportunity to play with our 'Immersive' technology!!

    Create a Unique character! Meet Interesting Characters! Fall in Love! Unlock Secretes, and Much, Much More!

    Warning!!

    We are not Liable for any harmed caused! Have fun, stay safe, but most importantly!

    Don't. Die.

    Language:
    English
    Words:
    113,441
    Chapters:
    23/?
    Comments:
    625
    Kudos:
    511
    Bookmarks:
    110
    Hits:
    11808
  16. Tags
    Summary

    Macha just wanted to get a hoodie before she moved out. That's all she wanted. She didn't want to die and be sent to a universe where some of her favorite characters hated her. At least some of them weren't quick to join the hate train.

    Language:
    English
    Words:
    3,909
    Chapters:
    2/?
    Comments:
    15
    Kudos:
    56
    Bookmarks:
    19
    Hits:
    403
  17. Tags
    Summary

    Vera was once an avid believer in magic till one day she was pushed to believe things like magic, monsters, and mages didn't really exist. On the day she realizes its all actually real in her world she decides to try something unpredictable that unknowingly would change her entire life.

    After losing her memory due to a pact/curse she finds herself in the 'care' of the Star Sanses who mistake her as Nightmare by accident. Will she be able to break this curse without losing those she cares about? Who else will come after her demanding answers? Or will the darkness consume her...?

    (Inspired by my story 'The Poison Apples in the Garden' I wanted dream to have someone to. <3)

    Language:
    English
    Words:
    11,032
    Chapters:
    7/?
    Comments:
    36
    Kudos:
    41
    Bookmarks:
    8
    Hits:
    514
  18. Tags
    Summary

    I had never thought I'd go into heat, hell didn't even know heats existent outside the animal kingdom. But now I was in one, and it was up to my Mates to take care of me. Eight days of heat... would I be able to handle that? Well, we'll see, but until then I'm just going to enjoy myself as much as I'm able to.

    Language:
    English
    Words:
    2,702
    Chapters:
    2/9
    Kudos:
    42
    Bookmarks:
    15
    Hits:
    482
  19. Tags
    Summary

    Black and Mutt have a new pet human. But she has powerful family and heaven help those who mess with the De la Cours.

    Language:
    English
    Words:
    8,001
    Chapters:
    9/?
    Comments:
    22
    Kudos:
    33
    Bookmarks:
    8
    Hits:
    618
  20. Tags
    Summary

    What... Happened? (Y/N), is a girl that wakes up in a hospital not knowing where she is, she was told to have amnesia over something that happened years ago that made her go into a coma for 5 years. Later, she inherits a little house, when she goes in she finds a note with a necklace that gives her strange abilities saying that she has to recover her memories a certain way because a disastrous event is coming and it’s up to her to save the multiverse. Will she be able to do it? And what surprises await her?

    Language:
    English
    Words:
    30,821
    Chapters:
    13/?
    Comments:
    9
    Kudos:
    32
    Bookmarks:
    11
    Hits:
    963

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