Undyne Stories

Abandoned on Mt. Ebott at the tender age of five, young Harry's unsurprisingly died, but Death's always had a weird relationship with his variant... Meanwhile, before Flowey's revival as souless talking flower, Sans makes a discovery under the mound of snow, Papyrus has always wanted to be a big brother anyways. *Edited Summary (29/09/2025)

what would happen if sans somehow managed to break the game and a new human had to navigate this broken world?

What if there was an anomaly in the Underground? No, not Frisk. Not Chara either. Someone else entirely. How could a few measly children stand to this supposedly immortal foe and save the Underground from destruction? Is it even possible to do so? Only one way to tell... ~o0o~ Disclaimers before you start! •There is NO fanon ships. That means no Soriel, Papyton, etc. The only ships are Torgore (in the past) and Alphyne. •This is NOT an x reader. I dislike those types of stories. The reader will have no part in this, and they will not be shipped with anyone. •This exists outside of canon to an extreme. For example, Frisk is the second human and not the eighth. •There will be OCs, but only for a few humans and they still technically exist in normal Undertale. •There is a sequel. I'm planning on rewriting it after this one, as it is much more random and definitely needs it. Clanky, plot holes/retconning, etc. It's more of an OC thing, to explore them and their issues, than an Undertale thing, but it has its similarities. •There will be some explicitives. It won't be unnecessary or excessive, only when it fits the situation and character. I will not be using any slurs, as that's just plain disrespectful, even if some of them apply to me. Credits: Undertale, obviously, created by Toby Fox and Temmie Chang. "The Time Before" by ANinnyMouse42 is the backstory for Sans in this AU with some adjustments (mainly since that was very close to my original idea before I read it and I don't want people to think I copied their masterpiece or smth, if you haven't read it please do so, it's really good). Some things will be in reference to the other books in the trilogy or "From War to Science" by Emotistic-optimistic. If you haven't, read that too. It's really good (along with its sequel). The cover was made by me! Have a good day! (Also, the title is a placeholder, if anyone has any ideas that make more sense, please let me know.)

Corporal Adrian Shephard, a US Marine Corps soldier assigned to the HECU division, was sent off to Black Mesa for 'cleanup duty'. Despite the hell he went through, the marine somehow manages to escape the dangerous, alien-ridden facility against all odds and, after being 'detained' by the ever elusive G-Man, is then assigned a new mission many years later... to the UNDERGROUND! Accompanied by Chara Dreemurr, the first fallen human turned apparition, the two journey through the unprecedentedly large Underground for one, very specific goal... but what exactly was it? And is that all there is to it? In... time, all will be revealed.

Chara looked back at me, his red glistening eyes were about to cry,"They talked, and I just listened, my brother telling Frisk about me. Telling him that he liked him more than me, that he wished that he was the first human to have fallen years ago and that he wished he never met...me," he sobbed and hid his tears behind his left arm he hurriedly put infront of his face. I pitied him, he was just a young child after all. Like me, the gang and Frisk. "If Frisk was the first human to fall years ago, my brother would've died like what Frisk did to Papyrus! Again and again and again! Until he grows tired of killing and thinks of another way in using his Reset powers!", he let his arm go and yelled at me. He was crying, blood substituting tears. "Nothing will ever stop me from killing Frisk, Gam, I AM TOO DRIVEN ABOUT REVENGE!", he controlled me and I turned around and pressing the toy knife into the monster, until it became ashes. Warning: Lots of Details, thash why ish not known.

I'm bored as fuck, so this is a thing. Ask any characters, from Frisk to Aaron. Main characters, side characters, etc. Anyone in Undertale(except Gaster because I'm not really sure about him, but he may be added)

This is an Undertale AU I originally planned on making back in 2019 but, I wasn't capable of making all the character designs and forgot about it for two years. A few months ago, I thought about redrawing the only two designs and reviving it as well as changing most of the original plot and instead of making a comic series, I'm writing it so it will be easier to think about more designs. OCs are included in this AU. If you would like yours to make an appearance, message, or tag me to discuss when they can appear. This is season 1 of the series and it will basically follow the events of Undertale because there was a strange, unexpected reset after 10 years of living on the surface. Now, it's up to Frisk to help her friends remember their lives before the reset and save the world before Flowey tries to kill all of humanity as well as monsterkind and Mystickind. Can the determined human survive yet another perilous journey through the Underground or will everyone fall to Flowey's hands (leaves?)?

You arrive at your destination in which people call the City of Monsters to live with, lo and behold, monsters. Not as a vacation, mind you, but for research because your friends were too lazy to do it themselves. You'll live with two brothers who have too much personality for their own good. It would be a long 6 months. A story where you, the reader, are basically female Akira with possible personality traits I added with even more headcanons. And this is a crossover to Undertale, whoops, actually almost forgot about that. No relationships unless I feel like a sans fangirl. Probably won't see much of the actual P5 cast out of mentions, texts and phone calls. Or maybe you will. Even I don't know, I'm just flinging a story I wrote at 2 AM. I might just leave it as just one chapter, but if not, meh. Oh yeah, there will be spoilers. Like, really detailed spoilers.

Undyne and Papyrus have always been an unshakable duo. Nothing can get between them... or so they thought. But all the best relationships have to go through trials sometime and they're definitely no different. ROMANTIC UNDYRUS. Implied Soriel. This story will be in 2 parts. It's also filled with delicious suspense and angst. Co-written by the-lovely-dobostorte

There's something wrong with the timeline. You've lived in an underground crypt with cracked green walls for as long as you can remember. And that's entirely the problem, you can only remember so much. Even as tortures and experiments continue without end, you're plagued with nightmares and glimpses into a different life, a life outside the green walls that you've been trapped inside for your entire life. There's a demon in the lab. Somewhere, you're sure of it, the scientist whom you have learned to hate is keeping a secret, another human besides yourself locked away. You don't know why or how they're connected to you, only that their name is Kris and they might be the answer to everything. There's something wrong with the timeline. And the whole universe might be thrown into chaos and bloodshed before you can fix it.

waking up with no memory of what happened in the previous hours, a certain skeleton struggles to put up with another soul, all the while hiding it from his younger brother, wanting not to burden him. But what will he do when not just him, but everyone else finds out?

You think war is over...? Because war never ends. Story takes place in the underground when an unexpected twist of Flowey brought chaos across the land of Undertale. Secrets of W.D.Gaster along with other characters also mystery that's hidden deep inside the True Lab... will the last glimpse of hope save everyone...? Or will it be destroyed like everything else...

Monsters have lost. Surrendered at the hands of the enemy. They've been locked away underground in a cavern system under Mount Ebbot. No sign of getting out. How will they live Within the Barrier? Credit to @_zbruh_is_awseome_ on instagram for the cover and for all the help on the book! :D This is still in writing phase so I won't be editing Grammer and spelling very much. WARNING: THIS IS A FANFICTION AND THIS STORY GOES HOW I WANT IT. IF YOU DON'T LIKE IT YOU CAN GO ELSEWHERE. THERE IS A DEFINED LINE BETWEEN CONSTRUCTIVE CRITICISM AND HATE COMMENTS. HATE COMMENTS WILL NOT BE TOLERATED. Disclaimer: All characters and some of the story line/details belong to Toby Fox or their rightful owners. There may be writings influence by NinnyMouse here on Wattpad and some characters and ideas where given to me with permission to use by _zbruh_is_awseome_ on instagram. Notes: Swearing, gore, or depressing themes may be shown in the book. No sin will be written for said book.

Once there were two teens one named Cory and one named Fris- Why am I telling the story if your here you know what it's about I'm talking dem Fangirls up in here!!! Stay tuned for BOOK2 It's called " •On the Surface•" btw stay determined and keep on shipping Corisk!!! also the bad cover art is mine ʕ•ᴥ•ʔ ❤️SofiaDeve❤️

This is my first fanfiction ever! Enjoy!

Soul mates arent real right? monsters and humans can never be mated right?Well let me introduce you to two who say otherwise

Lorsque j'ai pris son écharpe entre mes mains, j'ai compris. Les mains poussiéreuses, je me suis relevé. Je n'ai pas pleuré. Je n'ai pas hurlé. J'ai prié. Mais personne n'est venu pour me sauver. Car j'avais encore échoué. Néanmoins... Quelque chose avait changé. Car cette fois-ci, il existait. Ce recueil ne comportera que des AUs plus ou moins reliés à la route génocide, ou à des AUs sombres. J'ai fait un autre recueil, du même nom, qui est basé lui sur les premiers RESET géno, ainsi qu'un autre sur Sans et Frisk. Ah oui, et, étant moi-même une fille, Chara et Frisk sont pour moi des filles, . L'univers original appartient bien évidemment à Toby Fox.

Same as the last ;P

The tale of a 10 year old girl called Bell Angellight, whose life would be perfect if it wasn't because of the bullies. One day, a bully pushed her into the giant hole on the Mt. Ebott's cave, and made her fall into the magical place called Underground. What adventures will she have? Discover it by your own! Hehehe...

Naruto is neglected by his parents for his sister, whom has half of the kyuubi sealed within her and is treated as the hero of Konoha. One day a mob had been attacking Naruto when two ambassadors that were not from The Elemental Nations saved him. They ask him if he is alright. Does he tell them he's fine and walks away? Or does he tell them the truth and have a forever changed future?