1 - 20 of 10207 Works in Undyne (Undertale)

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  1. Tags
    Summary

    Dr. Sans Serif has been chosen to conduct an expedition to a newly discovered planet. There's a lot riding on this expedition; what Sans finds on this new planet could change the course of life on Earth.

    It’s a six week journey aboard a ship that is crewed largely by minimum risk offenders looking to trade labor for a commuted sentence that are kept in line by a group of soldiers led by Commander Red Gaster. At first the Commander seems to see Sans as nothing more than an assignment, someone he was charged with keeping out of harm’s way both aboard the ship and at their destination. But as they get to know each other, Sans is determined to win him over, though he needs to do it without losing focus on what he's come this far to achieve.

    Language:
    English
    Words:
    5,100
    Chapters:
    51/?
    Comments:
    536
    Kudos:
    172
    Bookmarks:
    15
    Hits:
    2961
  2. Tags
    Summary

    (Book 2 of my "Welcome Home, Serial Killer" Rewrite! Read that or else this won't make any sense to you!)

    Now, in a new home, with a little girl and a (probably) not mentally stable boyfriend, Sans was on his way to a new life. It was finally time to live for himself.

    Oh, and... several serial killers were his roommates. It was inconvenient, but they made it work.

    Now only if they could raise her to not be crazy like they are.

    Series
    Language:
    English
    Words:
    9,289
    Chapters:
    4/4
    Comments:
    35
    Kudos:
    42
    Bookmarks:
    8
    Hits:
    369
  3. Tags
    Summary

    Red hadn't even realized how far he'd stormed into the thick forest on the outskirts of town. It was possible he was on the border for vampire territory.

    Series
    Language:
    English
    Words:
    5,573
    Chapters:
    1/1
    Hits:
    6
  4. Tags
    Summary

    Sans didn't know who had gotten ahold of their world, who did purely True Pacifist runs several times in a row with no exceptions. Then, they stopped. He understood why when SHE fell down instead of Frisk.
    She had a Kindness SOUL. Of course she did.
    He didn't know how he was lucky enough to meet a Player who actually treated everyone Underground like actual people, let alone be liked and trusted by said Player.
    He wasn't about to lose her.
    Time to fulfill that promise to Toriel and actually keep her safe this time.
    He totally wasn't doing it for selfish reasons.

    Language:
    English
    Words:
    4,421
    Chapters:
    1/?
    Comments:
    2
    Kudos:
    8
    Bookmarks:
    2
    Hits:
    101
  5. Tags
    Summary

    How interesting. A human with magic. You don't understand. How do you have magic? You don't know. All you know, is that you are the only human with magic. And, you hate humanity. They have never been kind to you, nor have you been kind to them. But you have grown tired of this place. There are rumors, of a place mount Ebbot. It is said to have monsters trapped below. Few people believe this, but all anyone knows for sure, is that anyone who goes down... never returns. And that's why you decided to jump down. Hell, life with monsters will probably be a thousand times better than life with humans. The only reason you haven't jumped yet is because you know there's a chance you'll die on impact. Oh, and of course, because of the guards around the mountain to prevent people from jumping. So far, six humans (At least, they thought six) had fallen down the mountain, children, teens, and adults alike. Well, only one adult. But three children and two teens had fallen down to. Out of idiocy and curiosity you assumed. But, well, you supposed you were no better than them. Though, you were jumping down because you wanted to. And, perhaps, a bit of morbid curiosity. And with that, you jumped. And then. You heard a voice. (Cursing!)

    Series
    Language:
    English
    Words:
    21,584
    Chapters:
    12/?
    Comments:
    4
    Kudos:
    8
    Bookmarks:
    1
    Hits:
    317
  6. 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:
    7,661
    Chapters:
    4/?
    Comments:
    15
    Kudos:
    38
    Bookmarks:
    7
    Hits:
    486
  7. Tags
    Summary

    We follow YOU, the Player, on this epic Undertale story. You get sucked into the game on your computer and have no idea what to expect. Will you be able to get back home, or will you be stuck forever, never returning to your world, glitching out inside the game? You will meet all your favorite characters hoping that they will spare you and help guide you on your journey back home.

    Language:
    English
    Words:
    29,848
    Chapters:
    11/11
    Comments:
    10
    Kudos:
    20
    Bookmarks:
    3
    Hits:
    288
  8. Tags
    Summary

    Akira and Ryo's journey to defend humanity from the demons takes an unexpected turn when the duo falls into a mysterious cave.

    A turn that might be for the better or for the worst. But it's without a doubt a weird one.

    Language:
    English
    Words:
    46,113
    Chapters:
    7/?
    Comments:
    26
    Kudos:
    40
    Bookmarks:
    10
    Hits:
    670
  9. Tags
    Summary

    It was finally over… At long last, Angel was victorious. After their hard-fought victory, Angel decides to retire, and live a normal life.
    There are just two problems:
    Angel has no clue what ‘normal’ is…
    And real life is hardly ever normal.

    Series
    Language:
    English
    Words:
    88,923
    Chapters:
    25/?
    Comments:
    33
    Kudos:
    13
    Hits:
    892
  10. Tags
    Summary

    Comics, sketches, and illustrations—oh my!

    A visual representation of my Undertale worldstate(s)

    Language:
    English
    Words:
    0
    Chapters:
    5/?
    Comments:
    3
    Kudos:
    14
    Bookmarks:
    1
    Hits:
    231
  11. Tags
    Summary

    Glitchtale.
    Everyone knows it, and it’s hell.
    But in this timeline, Betty never betrayed them. Betty is a nice girl. And Betty …

    …Made a group chat.

    Series
    Language:
    English
    Words:
    10,208
    Chapters:
    21/?
    Comments:
    53
    Kudos:
    63
    Bookmarks:
    5
    Hits:
    1375
  12. Tags
    Summary

    Reset, after reset, after reset...

    This time, everyone remembered. Absolutely everything is remembered. Were Chara to fall, they'd encounter no one who is friendly.

    Then again, there are more ways into the Underground than falling.

    And the villain has had enough.

    Series
    Language:
    English
    Words:
    680
    Chapters:
    4/?
    Comments:
    8
    Kudos:
    1
    Bookmarks:
    1
    Hits:
    31
  13. 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:
    11
    Bookmarks:
    3
    Hits:
    107
  14. Tags
    Summary

    During a high of happiness, tragic circumstances led to the separation of a parent and child. Eventually, however, they had to move on and live worlds apart. Literally. That was the end for now. But the two didn’t know that. Many, many years would go by before they saw each other again anyway.

    But one thing’s for sure: no one even knew that the feared Radio Demon had a child from a different world, and, in the child’s case, no one knew her father was a cannibalistic serial killer in life.

    (In which the infamous Alastor and Chara meet and happen to have a biological connection. Basically, with a father-and-child tie.)

    Language:
    English
    Words:
    58,755
    Chapters:
    15/?
    Comments:
    148
    Kudos:
    168
    Bookmarks:
    38
    Hits:
    3782
  15. 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:
    20
    Kudos:
    108
    Bookmarks:
    23
    Hits:
    1195
  16. Tags
    Summary

    The city of Ebott is an unusual place; Mages and magic, defined by one of seven colors.

    Oh, and living in the shadow of a cursed mountain. Can't forget about that.

    However, an incident sends a certain group of seven children up the mountain. Even by mage standards, they are kind of... unusual. One question, though, still remains:

    Can they make it out of Mt. Ebott in one piece?

    Updates every other Friday!

    Language:
    English
    Words:
    50,394
    Chapters:
    31/?
    Comments:
    13
    Kudos:
    47
    Bookmarks:
    8
    Hits:
    1688
  17. Tags
    Summary

    When monster-kind has lost everything and the light of life is dimming, Gaster knows damn well he won't sit back and die without a struggle.

    (That could just be the god-complex talking, though.)

    Language:
    English
    Words:
    28,407
    Chapters:
    8/?
    Comments:
    31
    Kudos:
    38
    Bookmarks:
    7
    Hits:
    729
  18. Tags
    Summary

    Would you like to reset or continue?

    The yellow and black buttons appeared, glowing slightly in the darkness. Her body ached longingly. She didn’t want to continue, she wanted to go home, to see her friends again, and to see him. The smell of iron filled her nose as she looked past her body into the golden room they were in. The pillars lining the room were stained with blood, and there were jagged bones sticking out of the floors. The once beautiful stained glass windows now had holes in them. The room she once loved to sit in had now become the root of her fears. It pained her to fight, she never wanted any of this; she never should have listened to that stupid flower. Then she remembered what he, her best friend in all the time lines, had said,
    “If you're really my friend, you wont come back.”

    Language:
    English
    Words:
    7,784
    Chapters:
    5/?
    Comments:
    5
    Kudos:
    15
    Bookmarks:
    3
    Hits:
    290
  19. Tags
    Summary

    Y/n is not like other gir-
    Yeah no .

    Welcome friend! This here is the friendliest fanfiction you'll read so go ahead and grab all those friendliness pell- I mean chapters ! You'll meet all your favorite characters including flowey! And maybe even some new faces too! How exciting , won't you just start reading already? I mean all this introduction is a waste of time anyway I mean who reads those anyways ??? Go on Red!

     

     

    start reading..... c:

    Language:
    English
    Words:
    41,371
    Chapters:
    7/?
    Kudos:
    3
    Bookmarks:
    3
    Hits:
    168
  20. Tags
    Summary

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

     

    Language:
    English
    Words:
    40,088
    Chapters:
    13/?
    Kudos:
    71
    Bookmarks:
    19
    Hits:
    1551

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