1 - 20 of 2637 Works in Alternate Universe - Underfell (Undertale)

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  1. Tags
    Summary

    You, (The Reader), play as my Oc. Enjoy the story!

    __________________________________

    Ever since the monsters came to the surface, you fought for their rights. But, your effort was for naught. Captured by the biggest Anti-Monster foundation, turned into a skeleton monster, and forced to fight innocent monsters, or your family was murdered. And turns out they were killed a whole 3 months ago?
    Yup, that's you.
    And now these four skeletons rescue you and... are surprised when you seem emotionless and souless? Pft... you might not kill yourself for a bit. Heh...

    Language:
    English
    Words:
    14,559
    Chapters:
    20/?
    Comments:
    91
    Kudos:
    157
    Bookmarks:
    31
    Hits:
    2217
  2. 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:
    7,069
    Chapters:
    6/?
    Comments:
    45
    Kudos:
    153
    Bookmarks:
    27
    Hits:
    1128
  3. Tags
    Summary

    Санс пытается вернуться во времени туда, где его брат ещё не был убит. Он оказывается в Андерфелл вселенной, и на его долю выпадает гораздо больше, чем ему бы хотелось. Сможет ли Андерфелл Папирус помочь ему вернуться домой, или он навсегда застрянет в этом ужасном мире?

    Language:
    Русский
    Words:
    19,557
    Chapters:
    5/?
    Kudos:
    2
    Hits:
    111
  4. Tags
    Summary

    Red wanted a better life for his six-year-old brother, so he saved his money, scored a new job and hauled the temperamental brat halfway across the city to a new apartment, far away from the cesspit they once called home. Falling in love with his punny next door neighbor wasn’t part of the plan.

    Kustard | 100 Word Drabbles | Romance

    (For best experience, read in Entire Work mode instead of Chapter-by-Chapter)

    Series
    Language:
    English
    Words:
    22,900
    Chapters:
    229/?
    Comments:
    2243
    Kudos:
    1118
    Bookmarks:
    63
    Hits:
    19696
  5. Tags
    Summary

    Even MORE drabbles for the 'By Any Other Name' Universe. Including Challenges from '12 Days of Cheer'.

    Series
    Language:
    English
    Words:
    7,729
    Chapters:
    6/?
    Comments:
    135
    Kudos:
    108
    Bookmarks:
    4
    Hits:
    679
  6. Tags
    Summary

    It's the first pride week you've been to and the first monsters have been allowed to since they got to the surface. It's time for partying, fun, shenanigans, and a whole bunch of skeletons!

    Language:
    English
    Words:
    152,354
    Chapters:
    39/?
    Comments:
    756
    Kudos:
    686
    Bookmarks:
    110
    Hits:
    9045
  7. Tags
    Summary

    Bunch of Christmas-y writing prompts because ti's the season.

    Language:
    English
    Words:
    717
    Chapters:
    2/12
    Kudos:
    5
    Hits:
    103
  8. 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:
    121,399
    Chapters:
    47/?
    Comments:
    712
    Kudos:
    955
    Bookmarks:
    206
    Hits:
    14503
  9. Tags
    Summary

    The first time Ruby soldier Sans and his Sea Glass fuse

    Language:
    English
    Words:
    1,195
    Chapters:
    1/1
    Kudos:
    15
    Bookmarks:
    2
    Hits:
    72
  10. Tags
    Summary

    A collection of one-shots featuring our favourite firey bar owner in Underfell, Grillby!

    ----

    Mostly all of these were originally posted on my tumblr, as a majority of them are requests.

    Language:
    English
    Words:
    4,805
    Chapters:
    2/?
    Comments:
    6
    Kudos:
    26
    Bookmarks:
    1
    Hits:
    187
  11. Tags
    Summary

    What if there was something under the bed?

    Sans shook his head. Where had that thought come from? There was nothing there.

    Or was there?

    Series
    Language:
    English
    Words:
    16,602
    Chapters:
    19/26
    Comments:
    272
    Kudos:
    359
    Bookmarks:
    43
    Hits:
    2916
  12. Tags
    Summary

    It's been more than twenty years since you fell. You're not sure how long, exactly... long enough for six human children to fall and die in the underground.
    You've given up on saving them, almost, mostly, but you won't just stand by and do nothing.
    You won’t let another child die here. Not if you can save them.

     

    50,000 words about Chara being tortured and adopting a kid.

    Language:
    English
    Words:
    3,862
    Chapters:
    1/12
    Comments:
    2
    Kudos:
    5
    Bookmarks:
    1
    Hits:
    38
  13. Tags
    Summary

    A different look at the Underfell Bros universe... a war is raging on the surface and (Red) and (Fell) struggle just to get by. Then one day Stretch teleports over and opens their world.

    Language:
    English
    Words:
    16,832
    Chapters:
    9/?
    Comments:
    29
    Kudos:
    27
    Bookmarks:
    8
    Hits:
    241
  14. Tags
    Summary

    Just a average freshmen in college. (Y/N) had her life in order. She was working, going to school, paying bills, finding a new apartment before her current lease was over. She was adulting in the real world doing a great job, as well as falling in love with a bunch of skeleton monsters...Wait what?

    Language:
    English
    Words:
    7,653
    Chapters:
    5/?
    Comments:
    9
    Kudos:
    145
    Bookmarks:
    32
    Hits:
    2111
  15. Tags
    Summary

    (Y/N) (L/N) was once an icon; an absolute icon to the masses. But destroyed out of jealousy, she is given a new chance with a brand new power and is thrown right smack dab in the pre-main plot of Undertale, where everything hasn't gone to shit yet from Frisk's meddling.

    And she'll be damned to let these poor souls rot beneath ground, not when she has the power to stop it.

    And dammit all, she WILL persevere and achieve her goal!

    ...

    Now if only she wasn't so damn attached to Flowey.

    Series
    Language:
    English
    Words:
    41,878
    Chapters:
    12/?
    Comments:
    134
    Kudos:
    340
    Bookmarks:
    79
    Hits:
    3289
  16. Tags
    Summary

    Papyrus and his Detective partner (you) have to solve a missing persons case. It turns into a huge undercover operation where you still have to rescue the missing person: Sans!
    Along the way there's shenanigans, swearing, sex, misunderstandings, bad puns, and you fall in love with your spiky partner's brother.

    Language:
    English
    Words:
    38,436
    Chapters:
    12/?
    Comments:
    86
    Kudos:
    210
    Bookmarks:
    43
    Hits:
    2074
  17. Tags
    Summary

    Disgusting... It was the only word you could use to describe the world and the people inhabiting it. Ever since you lost the only person who truly mattered to you in your sorry excuse of a life, you hated the world and everyone and everything in it. But maybe it can be better. But maybe it won't.

    Especially when your father (one of the kings of the mafia) tries to sell you off like some bargaining chip in his back pocket to a pair of skeletons. The worlds gone to hell and all they can think about is wealth and who will inherit what. At least your not going to just lay down and take it like they want you to do. But what do you do when one of them is so damn persistent?

    Language:
    English
    Words:
    36,570
    Chapters:
    8/?
    Comments:
    82
    Kudos:
    152
    Bookmarks:
    38
    Hits:
    1671
  18. Tags
    Summary

    A series of December prompts and oneshots fulfilled by a few of the skeletons across the alternate universes! Here you can witness them enjoying the holidays with those they love most. Simply a collection of warm and happy tales in a winter holiday theme. >:D Mind the tags, here there be Yandere. >:D

    Language:
    English
    Words:
    20,000
    Chapters:
    13/25
    Comments:
    20
    Kudos:
    36
    Bookmarks:
    4
    Hits:
    661
  19. Tags
    Summary

    This is a big thing on tumblr, but I thought I'd try it out here? So go ahead, fill my comments! You should know what to do. ;)

    Language:
    English
    Words:
    866
    Chapters:
    3/?
    Comments:
    9
    Kudos:
    5
    Bookmarks:
    1
    Hits:
    86
  20. Tags
    Summary

    Red appears in a strange world unlike his. Everyone says hi to him, everyone worries about him...and he can see the sun!! What was going on?

    It didn't matter. What mattered to him was keeping far away from Gaster...and keeping his baby safe.

    (A story that just wouldn't leave me alone, so I'm back, again, here, right now. Will include very much explicit sex scenes at later dates, and I'll put warnings up)

    Series
    Language:
    English
    Words:
    102,040
    Chapters:
    54/?
    Comments:
    512
    Kudos:
    227
    Bookmarks:
    27
    Hits:
    3627

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