1 - 20 of 2124 Works in Alternate Universe - Underfell (Undertale)

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  1. Tags
    Summary

    Edge twitches, his soul skipping a beat, but before the tone could die out, he is by the desk, pressing it against his ear. “Private Detective Edge Serif, how can I help you?”

    “My name is Blue Fontaine,” a light voice with British accent says on the other side of the line, sounding incredibly serious. In the background, he can hear something that sounded like quiet sobbing. “I am calling on the behalf of Sir Razz Gaster of Duskshire Manor. We have heard of your abilities and we require your assistance. Sir Razz’s husband have been found dead.”
    ...
    A late night, after yet another unfruitful day with no work, Detective Edge Serif receives a phonecall from the countryside. There seems to have been a murder.

    Language:
    English
    Words:
    23,059
    Chapters:
    7/?
    Comments:
    17
    Kudos:
    32
    Bookmarks:
    12
    Hits:
    213
  2. Tags
    Summary

    Frisk was able to escape her world just in time, she falls into Underfell, now she must build a new life from the dust of her old life.

    Language:
    English
    Words:
    20,418
    Chapters:
    9/9
    Comments:
    3
    Kudos:
    8
    Bookmarks:
    1
    Hits:
    162
  3. Tags
    Summary

    One Shot Series.
    Underfell: Sans is the best thing to ever happen to you...until the day you find him with another woman. When he refuses to let you leave, you have to decide whether you should forgive his transgressions, punish him, or both.
    I've turned this into a series of One Shots about the Fell bros, Ch. 1 & 2 are alternate endings so I will keep the same summary.
    Smut chapters marked as *

    Series
    Language:
    English
    Words:
    81,902
    Chapters:
    28/?
    Comments:
    759
    Kudos:
    1062
    Bookmarks:
    156
    Hits:
    22865
  4. Tags
    Summary

    It's not that Y/N had a bad life, just one that wasn't very fun or fulfilling. When you meet Papyrus and Blue, everything changes. When you learn your twin sister, Edwina, met them, you fear you've lost their friendship as you had so many that Edwina wooed away. But, to your surprise, Papyrus and Blue were just the begining. Through a series of events not of your control, you find yourself even more intigrated into the lives of several skeletons. Some don't like you and some do, but that's life.

    And your life will never be the same.

    *currently editing all chapters*

    Series
    Language:
    English
    Words:
    99,527
    Chapters:
    30/?
    Comments:
    1209
    Kudos:
    773
    Bookmarks:
    154
    Hits:
    14224
  5. Tags
    Language:
    English
    Words:
    1,485
    Chapters:
    3/?
    Hits:
    18
  6. Tags
    Summary

    Frisk Foster, a blind twelve-year-old girl, is thrown--or, rather, lands in--a world of monsters. In this land of "Kill or Be Killed," she finds friendship in the form of a tattered, bossy flower and the ghost of a long-dead child.
    Will she stick to her morals and SAVE the monsters of the Underground, or will she be sucked into the pit of fear and hopelessness and give in to the fear-inspired concept of "Kill or Be Killed" the denizens of the deep live within?

    Language:
    English
    Words:
    90,151
    Chapters:
    33/38
    Comments:
    149
    Kudos:
    57
    Bookmarks:
    18
    Hits:
    1408
  7. Tags
    Summary

    As the saying goes, "You don't know what you got till it's gone."
    Sucks to be Sans, cause he's going to find that out the hard way.
    And when I say the hard way, I mean by his alternative versions of him and his brother getting involved of the situation.

    Language:
    English
    Words:
    6,998
    Chapters:
    5/?
    Comments:
    104
    Kudos:
    175
    Bookmarks:
    30
    Hits:
    1684
  8. Tags
    Summary

    Didn't you love me? Didn't you care? Why are you realizing everything after you ruined it?

    ---

    You had your chance, Now it's time for ours.

    Series
    Language:
    English
    Words:
    1,895
    Chapters:
    1/?
    Comments:
    9
    Kudos:
    30
    Bookmarks:
    7
    Hits:
    224
  9. Tags
    Summary

    Happy New Year! A new set of drabbles from 'by any other name'

    Series
    Language:
    English
    Words:
    6,220
    Chapters:
    5/?
    Comments:
    85
    Kudos:
    80
    Bookmarks:
    4
    Hits:
    448
  10. 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:
    104,820
    Chapters:
    41/?
    Comments:
    562
    Kudos:
    686
    Bookmarks:
    136
    Hits:
    9751
  11. Tags
    Summary

    After having nearly all her dates ruined by Sans, Frisk gives up hope on being able to move on from him; until an elegant monster with cracks in his face, lights up her world.

    Language:
    English
    Words:
    3,132
    Chapters:
    1/?
    Comments:
    3
    Kudos:
    24
    Bookmarks:
    5
    Hits:
    140
  12. Tags
    Summary

    After a long day of training, Papyrus is frustrated, and Sans takes an interest.

    Language:
    English
    Words:
    1,307
    Chapters:
    1/1
    Comments:
    2
    Kudos:
    14
    Bookmarks:
    2
    Hits:
    48
  13. Tags
    Summary

    Everyone hates Ink for what he did and what he is. But they forgot.... not all versions of Ink are bad. Fate wants to give its child a friend. They gave Ink himself from another universe. But this Ink isn't like Inky. He will make everyone realize that not all Inks are bad.

    Language:
    English
    Words:
    76,362
    Chapters:
    18/?
    Comments:
    137
    Kudos:
    225
    Bookmarks:
    21
  14. Tags
    Summary

    At the edge of the Monster Kingdom, lies the cottage of the Queen,
    Who is visited by a hooded girl, her face never seen.

    One day, while off the beaten path, she met a creature of bone,
    They told her he was a vicious wolf, but she could see he was alone.

    As the years went by, their bond grew and grew,
    'Till she told him that she loved him, and he confessed too.

    One day a human prince, power he wished to find,
    Stole away the hooded girl, so he could have a bride.

    So the wolf promised his Queen, soon after the girl was lost,
    That he'd bring back the hooded girl no matter what the cost.

    Language:
    English
    Words:
    1,034
    Chapters:
    1/?
    Comments:
    1
    Kudos:
    18
    Bookmarks:
    2
    Hits:
    93
  15. Tags
    Summary

    Your sister Frisk was always the adventurous type. You, being the only one she could look up to, were often dragged into her journeys, not that you minded of course. In fact, it was somewhat refreshing to see her so full of hope and determination, despite everything that was wrong in your lives.

    When Frisk asks you for permission to go hiking up Mount. Ebbott, however, you find yourself a bit reluctant to agree.

    After hours of pleading from your sister, you finally find yourself giving in to her request. As long as she stays close to you, everything would be fine...

    Right?

    Language:
    English
    Words:
    1,769
    Chapters:
    2/?
    Kudos:
    16
    Bookmarks:
    1
    Hits:
    254
  16. Tags
    Summary

    Life in Ebott city has never been easy for you. It was a crappy town, and you lived and even crappier life within it. It's no surprise that you decide to head to Mt. Ebott, intent on ending your miserable life once and for all. However, what is a surprise is what you find there.

    Spoiler -- it sure as hell ain't wonderland. Also, you may have adopted a talking flower.

    You really should have just stayed in Ebott.
    (UNDERFELL UNIVERSE).

    Language:
    English
    Words:
    22,184
    Chapters:
    3/?
    Comments:
    42
    Kudos:
    68
    Bookmarks:
    14
    Hits:
    629
  17. Tags
    Summary

    So you loved her, just not in the way she loved you.
    You broke her heart and she taken the pieces with her to prevent you from picking it up.
    Now alternate universe versions of yourself (as well as your brother and his alternate versions) seem to have the privilage to do JUST THAT
    Just because her soul calls out to them (much to your horror and guilt, you realized that her soul called out to you too and you never realized)

    (Basically a story of Sans p.o,v where he breaks your heart but then slowly realizes he fucked up when other versions of him, his brother and also his brothers alternate versions are headover hills inlove with you and are your soulmates)

    (Aka an idea i formed when all i read were angst undertale x reader stories and a fistfull of reverse harems)

    Series
    Language:
    English
    Words:
    14,150
    Chapters:
    9/?
    Comments:
    164
    Kudos:
    221
    Bookmarks:
    33
    Hits:
    3095
  18. Tags
    Summary

    You're just trying to live your life peacefully with your childhood feline while being no higher than 12 inches tall. Life is actually decent for a good stretch of it! Too bad it'll crash around you.

    Cool. Great. Yup, just what ya wanted. Double thumbs up.

    And by that? You mean that the home you have called yours has been sold off to these oddly similar looking skeleton brothers.
    Now you have to find out either a new place to run off to, or try and persuade these Monsters to allowing you to stay for at least the winter.
    Let's hope they're nicer than Humans...

    Being a bitty is tough work as it is, now you have more work put on your shoulders.
    Oh, lets not forget your memory sucks and is so screwed; You're rather unhinged and probably insane.

    Being alone for so long out in the woods would do that to a Bitty, you know! Let's hope it all works out in the end.

    Language:
    English
    Words:
    48,993
    Chapters:
    9/?
    Comments:
    17
    Kudos:
    77
    Bookmarks:
    12
    Hits:
    715
  19. Tags
    Summary

    After a horrid car accident killing both of your parents you and your brother are left to fend for yourselves having no other family left.

    Along with your parents' death came lots of depts. Soon you and your brother had to leave your childhood home having sold it to pay some of the debt off. But it wasn't enough. Eventually, one thing led to another and your brother joined a gang. It was fine at first since all he had to do was guard some VIPs, and it paid really well, but as he claimed the gang's ranks he found something he shouldn't have about the gang leader. Before he could tell you what it was your brother goes missing never to be heard from again…

    That was three months ago.

    Slowly the hope of seeing him alive again wore thin. And now all you can think about is getting your revenge on that dirty brother killer. Well, that and HOLY SHIT IS THAT A SKELETON!?

    Language:
    English
    Words:
    1,356
    Chapters:
    1/?
    Comments:
    2
    Kudos:
    15
    Bookmarks:
    3
    Hits:
    100
  20. Tags
    Summary

    You're a mystic skeleton who was heading to Ebott City for some monster food, when you got caught in a trap. You end up getting saved by a ghost skeleton and a weird skeleton who invite you to spend the night at their house. Life was already pretty interesting but who new meeting random skeletons in the wood could make your life way more interesting and exciting. Not that you're complaining.

    Language:
    English
    Words:
    26,305
    Chapters:
    7/?
    Comments:
    60
    Kudos:
    163
    Bookmarks:
    24
    Hits:
    1415

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