1 - 20 of 3909 Works in Alternate Universe - Underfell (Undertale)

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  1. Tags
    Summary

    You would never have said you had the perfect life. But after all the trials and tribulations you had gone through you were pretty content in how things turned out. Here you were bonded at 28 and moving in with your mate promising your dad the two of you would stop by for dinner later in the week. When you went to sleep in your mate's arms you could've never imagined waking up in your 15 year old body at the camp where your parents had sent you for the summer.

    You did everything you could think of to get back to your old life...or future life. After a while it became clear that things weren't going to ever be the same. Now at 24 you've witnessed the freedom of monsters and whatever hope you held on to slipped through the cracks in your soul. Luckily your ghost half roommate steers you towards seeking help.

    Language:
    English
    Words:
    11,088
    Chapters:
    2/?
    Comments:
    2
    Kudos:
    10
    Bookmarks:
    2
    Hits:
    89
  2. 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:
    19,359
    Chapters:
    8/?
    Comments:
    17
    Kudos:
    99
    Bookmarks:
    22
    Hits:
    1119
  3. Tags
    Summary

    You’re an average everyday person. A human, yes. Definitely not a cat… Until you are.

    A story in which you go about minding your own business living your non-cat life, and in a twist of moronic fate, find yourself turned-cat in a universe where undertale exists. Completely out of your element and trying to figure out how to survive, you… well you're not great at it.

    Luckily for you a kind skeleton monster takes pity on you and brings you home with him, and his seven other “cousins”.

    Language:
    English
    Words:
    7,762
    Chapters:
    2/?
    Kudos:
    17
    Bookmarks:
    4
    Hits:
    85
  4. Tags
    Summary

    Post Lotus death/revival soft angst cuz i missed these two

    Series
    Language:
    English
    Words:
    915
    Chapters:
    1/1
    Kudos:
    1
    Bookmarks:
    1
    Hits:
    9
  5. Tags
    Summary

    Sturmfrei the freedom of being alone.
    Perhaps taking a chance didn't always end poorly.
    You as a hybrid slave, taking a chance and going on a trip with the young lord end up on an uncharted island with a brigade of skeleton monsters. What shall you and the young lord do now?

    Language:
    English
    Words:
    441
    Chapters:
    1/1
    Comments:
    1
    Hits:
    9
  6. Tags
    Summary

    After your little sister ran away, you decided to strike out on your own. Nine months later, nothing was different except for the fact you slept in your car. Living in a 1997 Honda Civic in the parking lot of your local Walmart was not ideal, but it was better than rotting away under the same roof as your mother. You could have run far away, but you were bound here. Bound by blood and obligation. There was no escaping family.

    The machine was broken, and it would never work again. It was a mistake Sans would never live down, ripping alternate versions of himself and Papyrus away from their home and into a strange new world with no way back. They moved to this town far from Ebott hoping to create something new. To plant roots, find meaning or tie themselves to this world with Papyrus and Sans following at their heels. Out of guilt or obligation, no one was sure. There wasn't anyone else but each other, after all. It’d be an awkward tango wading through guilt and resentment, but everyone was trying. Family wasn’t built overnight.

    Series
    Language:
    English
    Words:
    76,323
    Chapters:
    24/?
    Comments:
    293
    Kudos:
    538
    Bookmarks:
    154
    Hits:
    11602
  7. Tags
    Summary

    When worlds collide, and you, lost, begin looking for a long time friend.

     

    Language:
    English
    Words:
    40,088
    Chapters:
    13/?
    Kudos:
    69
    Bookmarks:
    17
    Hits:
    1509
  8. Tags
    Summary

    Frisk has reached the end of the road in their resets and the strain of their timeline finally gives way right before they can fight with Sans.

    In a last minute feeling of regret, they try something unbelievable.

    They relinquish their soul, and the next thing Sans knows he's laying in a bed of flowers, feeling like he was ripped apart atom by atom and then put back together again.

    Also he has hair.

    And skin.

    And this new Underground he's ended up in isn't quite as friendly as he remembered. Great.

    Language:
    English
    Words:
    28,032
    Chapters:
    5/?
    Comments:
    57
    Kudos:
    105
    Bookmarks:
    17
    Hits:
    1043
  9. 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:
    44,538
    Chapters:
    8/26
    Comments:
    11
    Kudos:
    7
    Bookmarks:
    2
    Hits:
    172
  10. Tags
    Summary

    Underfell AU. Asriel's life is defined in colors. The black and red of a dismal life under his father's thumb. Green and gold, the joy and hope his friendship with Chara brought him. But when tragedy strikes and Asriel wakes to an Underground destroyed by the black of hate and the red of anger, he must choose what path he wants to take.

    Series
    Language:
    English
    Words:
    1,373
    Chapters:
    1/1
    Hits:
    26
  11. Tags
    Summary

    Look but do not touch, the warnings go, for if you caress a beautiful thing indelicately then it shall suffer.

    Language:
    English
    Words:
    3,656
    Chapters:
    2/?
    Comments:
    6
    Kudos:
    7
    Hits:
    77
  12. Tags
    Summary

    Just a rare pair that i got from a one-shot fic off of Wattpad, that i loved so here we are. Also the main pairing is Reaper!Sans/Dust!Sans. If you dont like it then please find something else to read. Thank you

    (Other ships that will get some scenes in the story )
    Error x Nightmare (Errormare | Engaged)
    Horror x Farm sans (Bloodycrops (I think )
    Cross x Killer (Koss/Criller)
    Classic x Red/Fell (Kustard | married )
    Dream x Blue ( platonic)
    Sci x Outer (Idk shipname)
    Fresh x Dance (idk shipname)
    Bill(Sans) x Error404 (idk shipname | married )

    Language:
    English
    Words:
    5,389
    Chapters:
    11/55
    Comments:
    6
    Kudos:
    34
    Bookmarks:
    5
    Hits:
    1029
  13. Tags
    Summary

    After the Fall of Atlas, Remnant huntress Weiss Schnee finds herself in a very strange world where everything is different, and huntsmen have never existed. As she struggles to find out what has happened to her (and the Relic of Knowledge that came with her), six strange, magical (and... rather demanding) skeleton monsters take her in, though they know nothing about her or what's happened to her, offering her protection from a world she knows nothing about.

    Of course, only in exchange for her services as a... maid?! A Schnee heiress, working as an indentured servant?!

    But there's yet another problem: in this world, humans don't have anything like Aura or Semblances. And if these skeletons find out that Weiss has them, they might think she's a mage.

    Given how... antagonistic these skeleton monsters are towards humans in general, and monsterkind's history with mages...

    Well, Weiss has quite a balancing act to keep up in this mansion.

     

    (NOTE: This work assumes that you are up-to-date with RWBY Volume 8 - if you haven't finished that volume, a lot of stuff I've written here will not make sense. I make some minor canon changes to get to the setup, but very minor.)

    Language:
    English
    Words:
    101,299
    Chapters:
    11/40
    Comments:
    100
    Kudos:
    135
    Bookmarks:
    22
    Hits:
    2237
  14. Tags
    Summary

    Mars, an alien, crash lands into the yard of a couple of skeletons who live in the middle of basically nowhere.

    When they wake up, they don’t know what is going on, and aren’t sure if these new faces understand them or even trust them.

    Language:
    English
    Words:
    422
    Chapters:
    1/?
    Comments:
    1
    Kudos:
    4
    Hits:
    22
  15. Tags
    Summary

    Once Milord was satisfied, Mutt finally gets to meet his alternative counterparts. In doing so, he meets someone tall, dark and actually interested in him? its unknown territory for him but luckily he's got a good guide.

    Language:
    English
    Words:
    1,960
    Chapters:
    1/1
    Comments:
    3
    Kudos:
    16
    Bookmarks:
    1
    Hits:
    72
  16. Tags
    Summary

    Underfell AU. Flowey has become Asriel again, and Asriel is adjusting to have his old body back. When his girlfriend Frisk proposes a trip to the beach, Asriel gets a chance to savor all the sensations he never realized he missed as Flowey.

    Language:
    English
    Words:
    4,187
    Chapters:
    2/2
    Comments:
    14
    Kudos:
    19
    Hits:
    370
  17. Tags
    Summary

    To most of the world, magic was a thing of legend. It was rampant in stories but didn't exist in reality. Hidden in the world, however, were monsters and mages, all safely shrouded in secrecy to keep "normalcy" preserved. Three years ago, the secret came out.

    Three years ago, Mount Ebott became a swirling vortex of energy that prevents most technology and magic from working. It opened up and monsters came onto the surface, which revealed those never sealed beneath the mountain and the humans with magical ability.

    Technically, Mount Ebott is super dangerous. You still jog there two times a week.

    Series
    Language:
    English
    Words:
    7,257
    Chapters:
    3/?
    Comments:
    15
    Kudos:
    32
    Bookmarks:
    9
    Hits:
    327
  18. 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:
    9,783
    Chapters:
    3/?
    Comments:
    5
    Kudos:
    10
    Bookmarks:
    4
    Hits:
    218
  19. 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:
    4,690
    Chapters:
    3/?
    Comments:
    14
    Kudos:
    35
    Bookmarks:
    7
    Hits:
    406
  20. Tags
    Summary

    Underfell Papyrus comforts you while you struggle with self harm.

    Language:
    English
    Words:
    515
    Chapters:
    1/1
    Kudos:
    19
    Hits:
    79

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