1 - 20 of 1343 Works in Alternate Universe - Underswap

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  1. Tags
    Summary

    Error and Blue make a bet: Error will stay with other sans from multiple AUs for less than six months
    If they can't make him change his mind, they die
    Of course, nothing is that simple
    With a expaserated Ink, an anxious Blue, and an obnoxious voice
    Error may find he's bitten off more than he can chew
    especially when a certain skeleton gets involved.

    Series
    Language:
    English
    Words:
    6,503
    Chapters:
    4/?
    Comments:
    20
    Kudos:
    47
    Bookmarks:
    7
    Hits:
    520
  2. Tags
    Summary

    Humanity is divided over one thing, the monsters reappearance. Some believe they should stay aboveground and others think they should be sent back where they came from. Then, there are those like you who don't know what to think yet. What will happen once you become acquainted with two skeleton brothers? Will you finally decide your standing on this issue and will you find love along the way?

    Language:
    English
    Words:
    83,055
    Chapters:
    36/?
    Comments:
    32
    Kudos:
    83
    Bookmarks:
    20
    Hits:
    1661
  3. Tags
    Summary

    Three Kingdoms existed in the Mt. Ebott Valley and have maintained a fair amount of isolation from one another. After a horrible accident, brothers find themselves left with the ruins of their father's legacy and fated to be slaves for the rest of their lives.
    However, being part of the Dreemurr Family Harem may not be so bad after all.
    *TAGS ARE BEING ADDED AS SITUATIONS/RELATIONSHIPS COME UP - THIS WILL (EVENTUALLY) CONTAIN FONTCEST, MULTIPLE BED-MATES, AND A LOT OF UNCOMFORTABLE CONVERSATIONS*

    Language:
    English
    Words:
    45,901
    Chapters:
    17/?
    Comments:
    75
    Kudos:
    203
    Bookmarks:
    33
    Hits:
    2995
  4. Tags
    Summary

    Inspired by the work of RacoonSinQueen's "Six Skeletons, One Maid."
    As well as MsMK's "Six Skeletons in Your Closet."

    An Alternate Universe fanfic of how Reader (You) involved themselves with a group of Skeleton Brothers (plus their counterparts from various AUs) under one roof and the whole shebang.

    Language:
    English
    Words:
    2,649
    Chapters:
    1/?
    Kudos:
    9
    Bookmarks:
    4
    Hits:
    60
  5. Tags
    Summary

    There are people with extraordinary powers in this world. People with superpowers. A few of them live normal lives, but for most of them there are two ways to go; become a superhero or a supervillain. Protect or destroy.

    Red and Fell Gaster have both been born with a superpower; they can emit poison from their bones, and are themselves immune against all poisonous substances. The problem is that there are some powers which are seen as inherently dangerous, inherently evil. And theirs is one of them. Therefore, it can be really hard to find a place for yourself in society if you have one of these.

    Some give up. Some takes on the role everyone have assigned them. Some become supervillains.

    Language:
    English
    Words:
    5,166
    Chapters:
    2/?
    Comments:
    10
    Kudos:
    40
    Bookmarks:
    4
    Hits:
    188
  6. Tags
    Summary

    Hell’s Studio’s Sammy Lawrence finds himself in the a very different studio, no sign of the one he knows in sight.

    Good thing Henry needs all the help he can get.

    Updates every Sunday

    Spin-off of sorts of this fic: here

    Language:
    English
    Words:
    21,791
    Chapters:
    9/?
    Comments:
    22
    Kudos:
    92
    Bookmarks:
    11
    Hits:
    834
  7. Tags
    Summary

    It would have been easier for Edge to bear if there had been someone to blame.

     

    There were any number of reasons that Edge and Red were currently stuck in Underswap. Fate, bad timing, the maliciousness of the universe...shitty luck. All of them and none of them were reason enough and really, it wouldn't have been so bad if Edge could stand his counterpart, Stretch.

    Language:
    English
    Words:
    38,622
    Chapters:
    11/11
    Comments:
    131
    Kudos:
    175
    Bookmarks:
    24
    Hits:
    1970
  8. Tags
    Summary

    Life on the surface is better than Papyrus could've ever dreamed. The humans are surprisingly accepting, and monsters don't have to live in hiding anymore. There's just one problem--a single human child has the power to reverse it all, including every last bit of progress everyone has made, making them a threat to the safety and happiness of monsterkind.

    So, what happens when an unstoppable force of DETERMINATION and a skeleton dead-set on giving monsters a happy ending are stuck on a beach trip together with friends who are happily none the wiser? That's for me to know and you to find out.

    Language:
    English
    Words:
    1,689
    Chapters:
    1/?
    Hits:
    10
  9. Tags
    Summary

    (New Summary)

    Undertale? Of course, you’ve heard of it. Who hasn’t heard of that popular video game? You’ve read more fanfics for that game than you can count. You never once considered that it was more than just a game, though. It’s not until you suddenly wake up in the world of Undertale that you realize that the characters are actually real.

    Amazing as this is, you can’t help but be concerned about how you got there. One minute you're walking to class, and the next you're waking up in the snow. And, if appearing in Undertale wasn’t already a big enough shock, you keep AU jumping and ending up in different Undertale-based worlds!

    While you have no problem with meeting the different versions of everybody’s favorite skeletons, you quickly realize something weird is going on in each world you visit. Something that’s causing a lot of trouble and damage. Looks like you won’t be able to go home until you figure this mess out.

    Well, at least you get to befriend some cute skeletons along the way.

    Wait a minute! What the hell is wrong with your soul?!!

    Language:
    English
    Words:
    231,632
    Chapters:
    33/?
    Comments:
    989
    Kudos:
    821
    Bookmarks:
    124
    Hits:
    12632
  10. Tags
    Summary

    There is still so much we do not fully know that lives in the ocean, but this team of marine biologists from the University of Ebott may be on the tail of something big.

    Series
    Language:
    English
    Words:
    2,573
    Chapters:
    1/1
    Kudos:
    6
    Hits:
    45
  11. Tags
    Summary

    A commission piece for Bucky!
    Bucky finds herself in Underswap where she meets a mischevious pair of twins named Stretch and Bee, and their brother Blue. Luckily they're all so accommodating to let her stay, but exactly how long can Bucky resist the twins?

    Language:
    English
    Words:
    5,037
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    7
    Hits:
    57
  12. Tags
    Summary

    After years of pushing his subjects to raise their LV, Asgore has abdicated his throne and left it to his son, Asriel. He is trying to turn things around, but even with the help of his newly appointed royal Judge, Undyne, and a mysterious talking flower that seems very...familiar...he's fighting an uphill battle.

    But never mind that. Politics are boring. You came here for skeleton shenanigans, right? I hope so. Or you're going to be disappointed.

    Alternatively: Sans is a little ball of fluff and energy, and Papyrus is on the very edge of falling to his LV. They make it work.

    Language:
    English
    Words:
    29,366
    Chapters:
    8/?
    Comments:
    90
    Kudos:
    160
    Bookmarks:
    12
    Hits:
    1151
  13. Tags
    Summary

    After the Assassination of the of Queen of all monsters along with her child ambassador Chara and their adoptive father Asgore, Monsters lose their beacon of hope and are quickly forced into slavery.
    heavily inspired by V_mum's fic Slavetale

    Set in the Underswap timeline.

    Series
    Language:
    English
    Words:
    43,642
    Chapters:
    16/?
    Comments:
    27
    Kudos:
    325
    Bookmarks:
    18
    Hits:
    2666
  14. Tags
    Summary

    Due to a recent turn in events, your sent out flying into the world in search of a new home. Thankfully, one of your fellow co-workers/friend was able to help out and allowed you the opportunity to land a sweet condo for rent. The size, the layout, the location, the renting price. Everything about this place was downright exactly what you needed.

    But knowing your stupid luck, of course things can't ever be this perfect in your life.

    ((Or, you end up renting a condo with no other options and it turns out you now have to live with invisible skeletons that aren't even from your universe. To make things more complicated, they end up making your new home a mess and a pain in the ass to care for. Fun.))

    Language:
    English
    Words:
    5,407
    Chapters:
    2/?
    Comments:
    16
    Kudos:
    30
    Bookmarks:
    4
    Hits:
    238
  15. Tags
    Summary

    You're in a gang situated near Ebbot City, and you live for the violence. You're not without your morals, they're just... flexible. But when one of your monster friends invites you to Grillbys, they might have accidentally brought you into a world of trouble. Can you keep your new skeleton friends from learning of your gang affiliations? What will their brothers do when they see your LV and EXP? And why are the amalgamates disappearing one by one, including your best friend Reap?

    Featuring friendly amalgamates, drama, high tensions, and traumatized skeletons, what will you do as your list of people to protect grows far faster than you ever expected?

    Series
    Language:
    English
    Words:
    65,636
    Chapters:
    27/?
    Comments:
    289
    Kudos:
    308
    Bookmarks:
    67
    Hits:
    4048
  16. Tags
    Summary

    Exactly what it says on the tin. A dump for Undertale things. Chapters will sometimes be linked.
    A pseudo gift to Omoni, as it will contain all work of mine that they can understand 100%
    Well, the above isn't quite true anymore, but hey, I'm still counting it as a gift.

    Language:
    English
    Words:
    8,912
    Chapters:
    10/?
    Comments:
    9
    Kudos:
    18
    Bookmarks:
    2
    Hits:
    373
  17. Tags
    Summary

    In the Kingdom of Hearts a pair of brothers live a modest life in the village in the Duchess' Duchy. That is, until one of them gets drafted for the army. And with the war against Spades going on, his chances of survival seems slim. Rus can't let his brother die.

    Language:
    English
    Words:
    4,038
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    4
    Bookmarks:
    2
    Hits:
    33
  18. Tags
    Summary

    You're a college student dammit, you don't need more stress in your life. To add salt in the wound, Sans fucks up in some fantastic way as per usual in these kinds of stories and somehow convinces you to put up with alternate versions of him. Now that Sans somehow finds a way to wiggle himself even more in to your life, you learn more about yourself than you ever really wanted to.

    ~~~

    A story of self-discovery, exploration of personalities, letting go of the past and moving forward.

    Arc 1: Who Am I?
    Chapter 1 - Ongoing

    Language:
    English
    Words:
    91,732
    Chapters:
    20/?
    Comments:
    410
    Kudos:
    861
    Bookmarks:
    133
    Hits:
    11297
  19. Tags
    Summary

    { s&m: also known as "souls & magic" }

    A collection of Character/Reader(s). Kinks & Smut. Requests are currently Closed !!

    Language:
    English
    Words:
    19,903
    Chapters:
    9/?
    Comments:
    42
    Kudos:
    421
    Bookmarks:
    57
    Hits:
    16935
  20. Tags
    Summary

    Summary: Underswap!Papyrus and Papyrus are bros and you can already guess who else are bros.

    Obviously, this is a stereotypical love not-incest-but-is story except for the fact I-! I mean the Author changed their mind and want everyone to die by the end of the year.

    Thus, the story begins with Underswap!Papyrus unconsciously forcing himself to build a machine so he can separate the timelines before it's too late.

    Warning: Story will get fragmented. o-o

    Language:
    English
    Words:
    3,070
    Chapters:
    2/?
    Comments:
    1
    Kudos:
    2
    Hits:
    17

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