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  1. Tags
    Summary

    You were living a somewhat normal life, until you fell to the Underground that is. Now you live with a comical skeleton and his optimistic brother. Everything was going along great until Sans tells you there’s alternate versions of him and Papyrus. Oh my, it seems that they are visiting soon too!

    What will you do as you quickly figure out that Sans and Papyrus have feelings for you- wait, it seems so do their alternate selves.

    What in the world have you gotten yourself mixed in?

    Language:
    English
    Words:
    19,404
    Chapters:
    19/?
    Comments:
    180
    Kudos:
    884
    Bookmarks:
    85
    Hits:
    17902
  2. Tags
    Summary

    You’re just an average, happy human, going about life, trying to forge your way in the world. Fortunately, you’ve landed a nice job that pays well, you’re steadily and reliably working your way out of the debt you gained from moving to the city, and you found a great apartment (with a chill roommate, Sans, a polite skeleton monster with puns up his sleeve and an indecipherable gaze) for surprisingly little rent.

    Everything’s fine.

    And then, without warning, two more skeletons seem to show up out of nowhere at your and Sans’s shared apartment. The first to appear is Red, a hot-blooded, sharp-grinned alcoholic who isn’t shy to share his less than savoury intentions with you, with crude gestures and pick-up lines galore.

    ... And the second is a tall, broad, but quiet skeleton who immediately goes by the pseudonym Skull, sporting a huge crack in his head and a single, engorged red iris, that never seems to stop staring at you.

    You’re not sure why both of them won’t leave you alone, or why Sans seems so desperate to stop them from interacting with you... But hey, what harm could come from it?

    Language:
    English
    Words:
    94,408
    Chapters:
    22/?
    Comments:
    992
    Kudos:
    2048
    Bookmarks:
    369
    Hits:
    26803
  3. Tags
    Summary

    (Y/N) is the second in command of the crew she was in. You were shown respect for it as being in second in command wasn't easy. You were on a ship going to enemy's land.

    Then something happened.
    You can't remember much other than a huge explosion happening on the ship.

    When you awoken you're stranded on a semi-huge island.
    The Island seems wild and unsafe to a soldier like you but you will do anything in your power to survive.

    Even if it means bumping into skeletons who have a thing for you on the journey to survival.

    Language:
    English
    Words:
    5,057
    Chapters:
    5/?
    Comments:
    31
    Kudos:
    68
    Bookmarks:
    19
    Hits:
    552
  4. Tags
    Summary

    Ink just wanted to have him by his side. He wanted him. Friend or lover — it didn't matter. He just didn't want Error to be a stranger.

    “You do realize that’s called ‘obsession’?”
    “Yeah, that’s just another one of my insanities. Hello and welcome.”

    Language:
    English
    Words:
    132,685
    Chapters:
    75/84
    Comments:
    1927
    Kudos:
    1524
    Bookmarks:
    102
    Hits:
    22246
  5. Tags
    Summary

    A minor change... with major consequences. An Underground unlike any other universe's. When Frisk falls into Mount Ebott, they will meet strange friends, terrifying threats, and the monsters you know so well--under very different circumstances.

    (A swap AU, where swapped characters retain their original personality but due to changes in their pasts, are in swapped roles. This is gonna be LONG and kinda dark, but hopeful!!)

    Language:
    English
    Words:
    64,967
    Chapters:
    43/90
    Collections:
    1
    Comments:
    55
    Kudos:
    37
    Bookmarks:
    3
    Hits:
    2027
  6. Tags
    Summary

    FallTale is my original concept for a new AU for Undertale and merging it with Fallout game universe. Quite frankly I am writing this to break free of current canons of the various Au's of Undertale and each specific version of the characters everyone has come to know and love. The premise is what if nuclear war happened while the monsters were still underground and when they finally managed to emerge to the surface how would they survive the wasted world they would come to find. The Fallout universe is definitely a dark one and twisted. With the law of survival often being the only law at all. The weak are made to serve or be used by the strong as they see fit. There is much depravity, evil, and cruelty. With that said there is a good possibility that the contents of this story at times will make people uncomfortable, I will not be tagging with specific warnings this is the general catch all warning. I am going for immersion and for me tags can ruin that. So reader beware, and enjoy the tale I am about to weave for you.

    Language:
    English
    Words:
    19,935
    Chapters:
    8/?
    Comments:
    12
    Kudos:
    12
    Bookmarks:
    3
    Hits:
    119
  7. Tags
    Summary

    Frisk has always thought that he was a normal human, and all of his monster frineds, alongside Chara and Asriel, have thought the same as well. But everything changes on his 16th birthday. Soon, he begins to learn that he's not a normal human as he begins to exhibit actions that aren't entirely such. With a new threat looming over him and his frineds and family, Frisk ad company will have to find the truth about himself, and maybe even Chara's as well.

    Series
    Language:
    English
    Words:
    95,371
    Chapters:
    37/42
    Kudos:
    4
    Bookmarks:
    1
    Hits:
    187
  8. Tags
    Summary

    W.D. Gaster, the current Royal Scientist, never wanted children. So when he appears in the throne room, holding two babybones, everybody is confused.

    Handplates is by zarla-s, this fic is for nina-thegamergirl on tumblr.

    Language:
    English
    Words:
    2,637
    Chapters:
    6/?
    Comments:
    20
    Kudos:
    44
    Bookmarks:
    3
    Hits:
    383
  9. Tags
    Summary

    You've always laughed a little too hard, smiled a little too much, and forgave the things you shouldn't have. Some, those who don't really know you, might just think you're insensitive, and maybe you are, but maybe, you're just doing your best to remain positive in a not-so-positive world.

    Up until now you've never had to confront your problems, have never had to think about your past, at least, until a certain child hops into your life and brings you all sorts of new friends. Friends that don't understand when to stop asking questions.

    Maybe it would be okay to open up to these people. Maybe it'll be different this time.

    Language:
    English
    Words:
    32,864
    Chapters:
    13/?
    Comments:
    242
    Kudos:
    1010
    Bookmarks:
    143
    Hits:
    14164
  10. Tags
    Summary

    * There are cassette tapes on the ground.

    * You press PLAY.

    Language:
    English
    Words:
    17,008
    Chapters:
    14/14
    Comments:
    1
    Kudos:
    7
    Hits:
    40
  11. Tags
    Summary

    The now adult Frisk is suffering from nightmares about the day she defeated Asriel and failed to save him from turning into the evil Flowey once more. Once she tells her worries to her closest friend, Sans, they develop an idea to stop the nightmares once and for all: return to the monster world and retrieve flowey in hopes that Alphys can return him back into his real self. In the meantime, Sans and Frisk grow closer and closer and develop new feelings for each other.

    Language:
    English
    Words:
    160,527
    Chapters:
    66/66
    Comments:
    756
    Kudos:
    1001
    Bookmarks:
    86
    Hits:
    29684
  12. Tags
    Summary

    Like most college students living on their own, you didn't have much money, and the fact that you didn't have a place to stay in the Ebott really freaked you out. Desperate to continue studying music in the city, you recklessly accept an offer to become roommates with two rich skeletal brothers, Sans and Papyrus, who end up being your best friends. Together, the three of you moved into a huge lodge up on the moutain, far away from the city. Now, two years later, you wake up one night to find that the basement was never truly just a storage room, and that Sans had been working on a machine that accidentally brought different versions of him and his brother into the world.

    Some of them tried to kill you. Some of them want to befriend you. One of them broke you nose.

    And, one by one, all of them slowly start to fall in love with you.
    But despite everything, what do you want the most?

    Language:
    English
    Words:
    35,761
    Chapters:
    4/?
    Comments:
    55
    Kudos:
    320
    Bookmarks:
    68
    Hits:
    2931
  13. Tags
    Summary

    "And in the end,

    I'd do it all again

    I think you're my best friend

    Don't you know that the kids aren't all,

    Kids aren't alright." 

    It's been about a year since the Monsters that were living under Mt. Ebott were freed from the Underground. They are living happily on the Surface amongst the Humans who are slowly coming to accept them, aside from some who are still upset with the fact that they are not alone. Cassidy is a human teenager almost like any other, but after a fateful encounter one morning before school, he finds himself facing trials, tribulation, and shenanigans as he learns about the Monsters that have come up from the Underground.

     

    ARC ONE: 1-???

    Language:
    English
    Words:
    20,198
    Chapters:
    6/?
    Comments:
    20
    Kudos:
    20
    Bookmarks:
    3
    Hits:
    216
  14. Tags
    Summary

    You and your husband have been trying for a baby for several heats now, and you feel as though it's now or never.
    When you finally get a positive result, it's not what you expect in the least, and it leads to your whole world turning around as you prepare for your bundle of joy.

    Series
    Language:
    English
    Words:
    13,796
    Chapters:
    7/?
    Comments:
    19
    Kudos:
    78
    Bookmarks:
    14
    Hits:
    727
  15. Tags
    Summary

    (read the tags)

    You're a skeleton who's living her life and trying to recover from the traumatic death of your mentor, Gaster.

    Too bad that damn machine won't stop haunting your thoughts.

    And now you've gotten yourself into a bit of a pickle

    If pickles are alternate universes where a ton of versions of the same two guys are hanging out at.

    Language:
    English
    Words:
    72,195
    Chapters:
    19/?
    Comments:
    575
    Kudos:
    605
    Bookmarks:
    99
    Hits:
    6354
  16. Tags
    Summary

    King Asgore made a vow to kill any human that fell Underground, a choice fueled by grief and despair.

    In one reality, it's a promise he's unable to keep.

    Series
    Language:
    English
    Words:
    23,892
    Chapters:
    33/?
    Comments:
    262
    Kudos:
    26
    Bookmarks:
    4
    Hits:
    591
  17. Tags
    Summary

    There is no easy way to put this.

    You had problems.

    A LOT of problems.

    And that's ok.

    And do you know who is going to fix those problems?

    Why Sans of course!

    Language:
    English
    Words:
    14,518
    Chapters:
    11/?
    Comments:
    120
    Kudos:
    263
    Bookmarks:
    49
    Hits:
    2925
  18. Tags
    Summary

    You needed a summer job and a place to stay for a while you weren't very good with having lots of money but lucky one of your closest friends who was wealthy and better yet wanted you and your other friend to help her out with a job in her Mansion that was now full of skeletons? your two friends knew a lot about monsters now you didn't mind them coming to the Surface but you were quiet scared of skeletons... oh boy this will be fun will you face your fears and not let your friends down?
    Editor: @NinaBeena

    (ft UnderTale, UnderFell , UnderSwap, G Sans and Papyrus, SwapFell, ReaperTale, HorrorTale and Mafia/MobTale )
    might add more AUs in future chapters XD see how the story goes

    Language:
    English
    Words:
    83,532
    Chapters:
    39/?
    Comments:
    32
    Kudos:
    156
    Bookmarks:
    25
    Hits:
    2488
  19. Tags
    Summary

    It wasn't fair, it wasn't—it wasn't fair. Frisk jumped to escape. Not to become a hero, a savior, some kind of martyr for an entire species they'd grown up hearing horror stories about; that was the opposite of what they wanted.

    Frisk disappointed everyone after all. Why would this be any different?

    OR

    Where the weight of the world rests on the shoulders of an emotionally damaged ten year old who doesn't know how to cope with the responsibility.
    /
    Not a faithful retelling of Undertale.

    Language:
    English
    Words:
    117,484
    Chapters:
    13/?
    Comments:
    156
    Kudos:
    179
    Bookmarks:
    22
    Hits:
    2431
  20. Tags
    Summary

    In a last ditch attempt to escape, Frisk, alongside her twin brother Harley, run up MT Ebott, and leap into the Underground. What they find is not what they expect. Read as truths are revealed, enemies become friends, and the true threat to the Underground comes to light... F!Frisk F!Chara M!OC. Genocide Route First, No Marty Sue, M for Violence

    Language:
    English
    Words:
    17,203
    Chapters:
    14/?
    Kudos:
    5
    Hits:
    35

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