Undyne Stories

Your favorite skeleton is back at it again... and again... agagaagaag Sans has had enough. Everyone is at the surface, holding their own jobs and lives. But... Sans can't ever let it fade from his mind. The dust. The cries. Watching the screen with Alphys as a child just rampaged in the underground. He is going to snap. He is mad. He is sad. He can never forget. Cover is NOT mine, find it online if you want ::Rights for the original concept and media 'Undertale' are all under the jurisdiction of Toby Fox. All other workings are done by me.::

If given the chance, would you start over? After falling into a timeline where nobody was murdered, his mother never died, and his father was never erased, Sans should be ecstatic that he has a second chance with his loved ones. But there is no denying the trauma he'd been through, either. Everyone is supposed to be dead, after all. What if Frisk comes back to take it all away again?

For 130+ years, monsters have been extinct with the only things left behind having been their hybrid children. Over the years as the hybrids continued to reproduce and 80% of the world's population went from human to superhuman. With the rise of superhumans came the rise of heroes and villains. AU High. Japan's #1 hero school. A place that produces Japan's finest heroes. A place that hides that last of monsterkind.

Corporal Adrian Shephard, a US Marine Corps soldier within the HECU division, was sporadically shipped off to Black Mesa for a seemingly simple job: 'cleanup duty'. Despite every single odd stacked up against him, the marine somehow manages to survive the dangerous, alien-ridden facility and, after being detained by the ever-so elusive G-Man, is then suddenly assigned a mission many years later... To the UNDERGROUND! Accompanied by Chara Dreemurr, the first fallen human turned apparition, the two journey through the Underground civilization for one, very specific goal... but what exactly was it? And was that all there was to it? In... time, all will be revealed.

It's a fall into darkness... a world of starving monsters. All that would do anything to survive. And that includes catching a human like you. Horrortale. Inspired by Undertale, based on the Horrortale universe. Credits to Toby Fox and Temmie Chang for their respective characters and Sour Apple Studios for creating Horrortale. Just a small warning that there are some grusome imagery. Continue reading only if you're okay with it! (Art credited to it's respective artist.)

A band of misfits find themselves dragged into a battle for the fate of every world in existence.

You fell down somewhere down a hole, down into a world where everyone seemingly wants to take your very own SOUL. Mt. Ebbot, however, is no exception. They say those who climb the mountain are never seen again, now see what happens when you fall down. Of course, not by choice, but by accident. (Anyways, this was what I've been working on. It's not entirely done yet, but I finished the main thing.)

You're one of the most powerful monsters in the underground, that's cool and all but you're held back by others but soon you have to take up a responsibility that will force you to your limit. and the worst part, secrets will begin to be exposed about monsterkind and the creatures of Equestria.

After Undyne sees Sans using his full strength on a surprise ambush, Sans gets forced into a promotion from Sentry to actual guardsman, still trying to do the bare minimum while Undyne forces him to give it his all. I don't have any money for commissions for the cover so I just gotta hope I hit it big and get fanart or we sticking with the Tumblr header that's not centred. Other than that uhh, credit me if you do anything with these guys in your work. Also isn't it kind of weird the only change I needed to make for this story to work is just to delay the time it takes for some of the humans to fall into the underground? Credits: Toby Fox, Temmie Chang and the Deltarune Dev Team: For making Undertale/Deltarune.

This story takes place after the events of the pacifist ending of Undertale, where all the monsters have already left the underground. However, that won't stop problems from starting again; Frisk and his friends will have to face a new threat. DISCLAIMER: This story is based on the fact that the first human fell underground in 2015 and the last in 2060. Here, Deltarune is a sequel to Undertale; therefore, Posttale is not a copy of TobyFox's creation, but an adaptation, or what is also called an "AU." Because of this, there will be things that are different from canon and adapted to my personal preference, with no intention of disrespecting anyone; for example, the gender of the humans: Kris: M Chara: F Frisk: M Don't like it? You can leave. Understood? Great. Contributors: @Fwrevy #Deltapad • Undertale and Deltarune are property of Toby Fox. • Images used in the story are property of their respective owners or made with AI. *#27 in the "Undertale" category 6/13/2026* *#3 in the "Deltarune" category 3/3/2026*

THIS IS NOT A FRANS FIC! Ok now that that's out of the way... This is my first real fanfiction so I hope you all enjoy it. Frisk tries to kill themself and Sans stops them. btw my headcanon is that when the monsters moved to the surface Frisk decided to live with Sans and Papyrus. WARNING: If you are not ok with suicidal themes then the story ends here I guess.

Papyrus, Undyne, and Alphys are hanging out in Waterfall on Halloween talking about their plans for that day. It doesn't go as expected. (Was a oneshot, is now continued and finished!)

A pony, a skeleton, a flower, a story. Sans the skeleton was used to the resets. He didn't like it, not one bit, but there was nothing he could do. It was always the same cycle: The human falls, the human either saves or slaughters the monsters underground, the human resets. It was all the same. But then one day, it wasn't. Lightning Song was a pony from a whole other dimension, Equestria. She was rather lonely, always talking to the "voices" in her head. But then a skeleton figure suddenly appeared in her room, and everything changed. A friendship that started from a mistake, Lightning Song and Sans soon became the best of friends. They found that, together, they could do anything. Even being able to fight off a pink flower hungry for revenge. But it was the same pink flower who tore them apart. And remember, he is watching, but not necessarily out of his own eyes... ~Book 1 in the Lightning Song and Sans Series~

All Sans has ever wanted to do was forget, and when he finally does it doesn't lead to anything good. More like: oh no I fucked up the timeline. Yeah this isn't good. part 1 of the The Main Timeline series. None of the music or art will belong to me. Unless I say it does. (P.S. Killer Sans was made by tumblr user Rahafwabas.) Read the freaking tags

To protect your secrets, how far are you willing to go? This is the dilemma that Papyrus, the royal guard's captain of Snowdin town is facing since he accepted to protect the last fallen child. What he thought would be a simple task is slowly driving him away from his guard's duty, at the worst time possible. When he finally understands something is really wrong with Undyne, his rival and only friend, it's too late. Overnight, the general announces to him that he is now in charge of the royal guard and disappears from his life. Even if he tried, Papyrus couldn't resolve himself to let her go without knowing why she gave up on everything in one night. However, by trying to dig out too many secrets, Papyrus has to face a lot of problems. Threats, intimidation, someone is trying to force him to give up. But the more he searches, the more he realizes all the tracks lead to Asgore. The King is known for his impeccable justice and his absence of mercy. If he doesn't give up, he might lose way more than just his job. Split between his vocation and his friendship, Papyrus will have to make a choice.

(Y/N) was an average kid on the surface. They had learned about the war between Humans and Monsters and that they should never go to MT. Ebott. It was dangerous there. And you knew it. But you where determined to find your older sibling who had left to find you both a home. They had gone to MT. Ebott for you and you had to find them. Your big sibling meant the world to you and if you just sat down and did nothing you'd be letting them down. You had to find them... You had to find Chara... Undertale belongs to Toby Fox Cover Art and all other art in the book is not mine unless I say otherwise

In this story Frisk a 8 year old decided to Stay trapped in The Underground with Her New Friends she made. Toriel and Asgore got back together and let Frisk live in the Kingdom as their own Child. She finally convinced Flowey to join them as well, he join in the family but never told Asgore and Toriel that he was actually Asriel. They were both left alone in the castle while all monsters went to a meeting to figure out how they will get out of the Underground without using the souls (the souls are kept safe in a room so they can be rightly lay to rest) as they were in their room a magic mirror appeared in a corner, she and Flowey walked to it and lit up and both were sucked into it. They appeared to have landed on a patch of Grass and Flowers at a near by Town, they pass out from the hard falling. They soon woke up to see and Cat and and Mouse next to them asking them if they were okay. She then met A rabbit and a Gremlin to help them, she told them where they came from and asked if they can help them get back home or someway to help her since she was a young child with a flower friend with her. But what would happen if The Mad Doctor appeared and toke both of them and became in danger?

A story of Undyne the undying but only few know her as (Y/n). She was always mistaken as a trouble maker, picking a fight with anyone she see but what they don't know that she's never the one who start it and she fight to protect those who can't. her parents was a shame of her and always favoured her sister. she's been trying to get their attention but always failed but soon she'll meet a faunus named asgore. she'll pick a fight with him and lose then the faunus ask if she would like to know how to beat him. years later she's apart of a royal guard no longer seeking attention and fights only to protect and serve her people

Frisk has just saved the monsters from their impending doom underground. Perhaps it was fate? Maybe Frisk was meant to fall underground with nothing but Monsters around. Or maybe she wanted to bring peace? No one really knew the thought process, but everyone knew she was to become the Ambassador. ** This is a continuation of the Pacifist Route in Undertale. This contains ships, bits and pieces of the fandom, and other adjustments of which is my design.** **Please note, that I am an amateur writer with very little experience.** **None of the art is mine** **Undertale is rightfully owned by Toby Fox**

It's an undertale fanfic. deal with it. Abused her whole life, she's gone numb to any emotional or physical feeling. One day, it ends. Her dad drops her off on mt. Ebott and never returns. No where to go, she climbs the mysterious mountain and falls to her doom.... Or does she?