1 - 20 of 38 Works in Aged-Up Frisk (Undertale)

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  1. Tags
    Summary

    This story depicts the struggles of the monsters after moving to the surface. The coldness they were met with and the problems they have to deal with after encountering humans. Mostly Sans and Frisk centered, it follows the evolution of Frisk growing up as an ambassador, and Sans' feelings and comfort around humans. Just like in today's society, we are having a hard time accepting anyone that does not look or think like us, we tend to isolate them, make them an enemy, judging on looks, race, ethnicity etc., in this case, the monsters became the race that almost everyone decided to label as enemies.

    Language:
    English
    Words:
    29,660
    Chapters:
    18/?
    Comments:
    2
    Kudos:
    38
    Bookmarks:
    1
    Hits:
    688
  2. Tags
    Summary

    Kris is a weird kid. But then again, they have a brother who used to be a flower, a sibling who likes knives a bit too much, and a sibling who's the literal ambassador for monsters and claims every fight can be solved by flirting. So maybe Kris is actually pretty normal by their family's standards.

    (AU were Deltarune takes place post Undertale True Pacifist ending)

    Language:
    English
    Words:
    1,835
    Chapters:
    1/?
    Comments:
    3
    Kudos:
    34
    Bookmarks:
    4
    Hits:
    267
  3. Tags
    Summary

    Monster where freed by frisk the human who disappeared after the barrier broke 25 years ago. No one knows where they went. Frisk soon be came a legend.

    Toriel died from an assassination, poison, 11 years after they where let out. Asgore declared war on humans, almost whipping them out. From 80 million humans soon became 7 hundred. Asgore was wounded in battle, and was soon killed the same way toriel did. Asgore was barred next to toriel. At the start of the underground.

    No one became king, instead set up the same things humans once had. Presidents and stuff like that. If a hostile human was found, they were killed on the spot.

    14 years later, Sans went back to the Underground to get something from his old lab, at the bottom of his house. As he was about to head back he saw someone he hadn't seen for a long time. Flowey.

    Sans, couscous followed Flowey back to the start of the underground where he found a hooded person water the flowers that sat on the royal family's graves.

    Language:
    English
    Words:
    1,953
    Chapters:
    1/?
    Comments:
    2
    Kudos:
    11
    Bookmarks:
    1
    Hits:
    84
  4. Tags
    Summary

    Sans has a hard time accepting his feelings for a certain grown up human and his whole world is turned upside down in just one night. Rated MA/Explicit for language, lemons, and adult situations.

    Language:
    English
    Words:
    88,780
    Chapters:
    59/?
    Kudos:
    12
    Bookmarks:
    3
    Hits:
    357
  5. Tags
    Summary

    Frisk managed to fall down a mountain, find some scary ass monsters, and now she will have to fight for her life. But hasn't she done this all before?

    Language:
    English
    Words:
    3,274
    Chapters:
    3/?
    Kudos:
    3
    Hits:
    103
  6. Tags
    Summary

    Chara sighed as she wiped it off of her face with a flick of her wrist, standing up and stretching. "Well, if you ever change your mind, call for me" she sent the raging pinkette a smirk. "I'll be listening"

    Language:
    English
    Words:
    1,119
    Chapters:
    2/2
    Kudos:
    2
    Hits:
    96
  7. Tags
    Summary

    Frisk had finally befriended Sans before the timeline unexpectedly reset.
    Sans helps Frisk to do it all over again.

    I'll add tags and warnings as I go.

    Series
    Language:
    English
    Words:
    8,683
    Chapters:
    6/?
    Comments:
    42
    Kudos:
    62
    Bookmarks:
    8
    Hits:
    633
  8. Tags
    Summary

    In this AU Chara hated monsters, so much so that when she Fell she killed all the monsters in the Underground. Well… nearly all. sans was much too quick to be killed, but he still wasn't quick enough to save himself /and/ his brother.
    But that was years ago. sans has finally found a way out of his empty shell of a home, by going to a different Timeline.
    He figured he could blend in, just live the rest of his miserable life with the weak hope of things getting better.
    That was, of course, before a certain little brown haired angel hugged him from behind. The way she said his name nearly made him tremble, for it held all the warmth in the world. He had turned towards her and seen her face drop and turn nervous. She had mistaken him for her sans. Little to her knowledge, at that moment that sans in front of her was DETERMINED to become her sans. Whether she liked it or not.

    Language:
    English
    Words:
    4,025
    Chapters:
    4/?
    Comments:
    11
    Kudos:
    33
    Bookmarks:
    1
    Hits:
    301
  9. Tags
    Summary

    Frisk had to be either really brave, or a special kind of stupid to stick her nose where it didn't belong. That's what everyone thought when she got herself involved with the Conway Case. Where the police had left it alone, Frisk saw rage, and an opportunity. An opportunity to give justice to a family through the written word.

    But the deeper she searches, the darker the tunnel gets, filled with sharp twists and betrayal. Everything she thought she knew is turned on it's head, and her life is on the line. Things certainly don't get easier when she attracts the attention of the most notorious crime boss, or when Death himself begins to chase after her. Will Frisk unearth the truth of the Conway Murder? Or will she join the ranks of bodies at the bottom of Ghost lake?

    Language:
    English
    Words:
    30,787
    Chapters:
    6/?
    Comments:
    23
    Kudos:
    24
    Bookmarks:
    4
    Hits:
    288
  10. Tags
    Summary

    Not everything is as happy as it should be. The Human world differs greatly from that of the Underground; especially as Monsters and Humans learn to coincide. Scuffles happen, characters grow up & mature. Reality hits, and sometimes things get broken.

    Language:
    English
    Words:
    29,579
    Chapters:
    10/12
    Comments:
    109
    Kudos:
    170
    Bookmarks:
    20
    Hits:
    3117
  11. Tags
    Summary

    Mettaton's favorite genre is romance.

    Language:
    English
    Words:
    582
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    4
    Hits:
    71
  12. Tags
    Summary

    Frisk is a jerk who DESPISES prostitutes. So, one day, she shrinks Chara, a well known prostitute and porn actor, and forces her to be her sex slave.

    Series
    Language:
    English
    Words:
    1,066
    Chapters:
    3/?
    Kudos:
    8
    Hits:
    893
  13. Tags
    Summary

    Life out here is hard when your eye takes up 85 percent of your face. People gawking, living without depth perception, weird fanboys, someone asking to take your picture, or just dealing with people in general.
    You're just a young cyclopes trying to make ends meat. So the best job for you now is acting as the personal assistant to the uber famous and super conceited superstar, Mettaton. Your days are filled with running errands and following around the metal primadonna like a shadow. Who would have thought that this job would lead you to a make a few unlikely friends and find possible love in a very scary, but surprisingly nice skeleton?

    Series
    Language:
    English
    Words:
    20,892
    Chapters:
    8/?
    Comments:
    33
    Kudos:
    129
    Bookmarks:
    21
    Hits:
    1513
  14. Tags
    Summary

    (Takes place in a Au where the monsters and human war never took place.)

    If there was one thing Frisk was good at, it was flirting and coming back from dying.

    ResetQuirk!Frisk/Multi

    Language:
    English
    Words:
    184
    Chapters:
    1/?
    Comments:
    4
    Kudos:
    23
    Bookmarks:
    2
    Hits:
    357
  15. Tags
    Summary

    *you find a page among the dirt and the leaves*

    if you are reading this, send help! My name is Frisk, and I fell down.
    Down into the underground. It’s cold, dark, and I can’t stop running for my life. The monsters are here. Just like they always told us, they’re REAL. There’s something wrong with them, and the skele-

    *Blood and dust make the rest of the page illegible.*

    Language:
    English
    Words:
    28,629
    Chapters:
    10/?
    Comments:
    83
    Kudos:
    42
    Bookmarks:
    8
    Hits:
    590
  16. Tags
    Summary

    EDIT: I have a tumblr for the au! Come ask me questions!

    https://realitythe2nd.tumblr.com/

    EDIT: Currently looking for a Chara Voice actor for my AU! You have to be willing to do nsfw, but it's paid work. Comment letting me know if you're interested! I need a female voice for them.

    Frisk falls into the Underground.

    They have no memories because they have never had any to start with.

    As an adult, not knowing how to talk or walk or read is going to make saving the entire world very difficult.

    And, damn it all, Chara is NOT okay with being replaced!

    But once they calm down, (and Frisk takes off their old clothes), things will be JUST fine.

    Language:
    English
    Words:
    27,971
    Chapters:
    18/?
    Comments:
    119
    Kudos:
    118
    Bookmarks:
    8
    Hits:
    5248
  17. Tags
    Summary

    Your study on the monster origins leads you to seeking out ways of venturing into the underground. Now that they roam the earth side by side with humans, it’s your job to research their history and find out more about them. Your friend, colleague, and the ambassador of the monsters, Frisk, however refuses to help you… so once mistakes have been made, you find yourself having to count on a brand new friend to return to the surface.

    Language:
    English
    Words:
    222,395
    Chapters:
    36/36
    Comments:
    207
    Kudos:
    840
    Bookmarks:
    74
    Hits:
    13798
  18. Tags
    Summary

    This is my version of Underfell. It IS a SansxFrisk fanfiction. Don't like don't read. Frisk gets sent to Underfell and instead of acting like the Underfell characters think she should she completely surprises them by acting very different.

    Language:
    English
    Words:
    42,050
    Chapters:
    11/?
    Kudos:
    54
    Bookmarks:
    7
  19. Tags
    Summary

    Several years after multiple runs of Undertale, Frisk and Chara are free from the control of the Anomaly. Despite that, their relationship is rocky at best, but unfortunately, when you're both stuck by the SOUL, you can't just leave the other behind. As a result, both are forced to endure several misadventures together, and along the way, hopefully learn more about one another.

    (Couple notes: both Frisk and Chara are somewhere in their mid-late teens, and neither are fully wholesome people, though they both also don't lean towards outright evil even at their worst. The story is written chapter-to-chapter, so expect a loose narrative at best with not much coherency, at least at the start.)

    Language:
    English
    Words:
    7,167
    Chapters:
    3/?
    Comments:
    14
    Kudos:
    15
    Bookmarks:
    5
    Hits:
    241
  20. Tags
    Summary

    Frisk has been undercover for 3 years infiltrating The Ghouls, Ebbot's largest criminal organization. Unfortunately she is also Dating a high level enforcer, Sans who's brother just so happens to be the leader of the group. Divided in between her two Identities she must make the hard decision of choosing love or upholding the law. Meanwhile narcotics detectives Chara Racter Asriel Dreemurr are dealing with stolen determination injections related to the gang.

    Language:
    English
    Words:
    155
    Chapters:
    1/?
    Comments:
    1
    Kudos:
    8
    Bookmarks:
    1
    Hits:
    204

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