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What Would Markus Do? by HopeStoryteller
Fandoms: Detroit: Become Human (Video Game), Undertale (Video Game)
15 Jan 2020
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Summary
“My name is Connor. Don’t worry, I’m not a—”
“HUMAN!”
Connor audibly groans. Even as he knows he’ll be pursued soon if he isn’t already, he takes a moment to pinch the bridge of his nose, then looks back. The logical thing to do would be start preemptively running. Instead, he glances back and shouts, “Android, actually!”
An energy spear shoots through the air, passing not an inch away from his face and lodging itself in the wall nearby. Judging by that, and the angry yelling coming from its thrower, Connor decides it may be a good time to run.
Humans and androids have found themselves in an uneasy peace, although that’s not to say there isn’t still a long way to go. Then Connor’s asked to investigate a site where humans have been disappearing for a very long time. And, suddenly, everything’s a lot more complicated.
Of course, Connor’s the only one who knows just how complicated things are now, and he’s got slightly bigger problems at the moment. Like staying alive, and one step ahead of the monsters that want to steal his apparently very human soul.
(Now with cover art on Chapter 1!)
- Language:
- English
- Words:
- 82,426
- Chapters:
- 35/35
- Collections:
- 7
- Comments:
- 1,497
- Kudos:
- 3,066
- Bookmarks:
- 667
- Hits:
- 50,830
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Bookmark Notes:
Deviant Connor x undertale fic finished
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Summary
A semi-modern world, between the 1800s and 1900s, circuses are a great sensation.
You have worked in one since you were born, always following the family path.
Everything in your show life was going great, until that cage arrived.
Now you're stuck between a rock and a hard place, integrity and perseverance fighting fiercely for a victory that… doesn't really matter, because in the end, will there be any change?When the warm light falls on you and the music of its soft embrace, you will take a leap of faith.
You will break their chains and yours, when the truth comes out and your soul guides you towards your destiny, squeeze the knife in your hands and remember to always smile.
The audience awaits impatiently… it's showtime!-
Bookmark Notes:
HEHEHHEHE..
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Gaster's group chat he made for his subjects by Gabe_reviews0408
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
19 Sep 2025
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Summary
gaster gives Undertale characters from the three games multiple group chats so they could talk and learn about each other.
nothing ever goes wrong.
inspired by the many groups chat fan fictions
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Exacting Their Revenge: An Undertale Fanfiction (Echotale Gaster!Sans X Cannibalistic Holocaust Reader) by orphan_account for
Fandoms: Undertale (Video Game)
17 Jan 2020
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Summary
Your stomach rumbled. Making you move ever so slightly. It was nearing your feeding time anyway. You ever so slightly lifted your head off of your battered arms to give an ice cold glare to the glass window that separated your room to the rest of the asylum. The glare you were currently giving the window was one of those glares that could render a full grown man helpless. You smirked once more at that thought. Though this time, your smirk was plainly visible to the people currently monitoring you from the safety of the other side of the glass window you were currently looking at. That's right. They were safe from you with being on the other side of the glass.
Things to look out for:
~ Blood and gore
~ Mentions of violence
~ Cannibalistic notions
~ Horror topics
~ Upcoming intimate scenesWARNING: This story is very graphic, and not for the faint of heart! There are mentions of upcoming rape scenes, graphic depictions of violence, profanity, and a whole lot of blood and guts. This is rated M for a reason. If you have not already read the summary for this fanfiction, I highly suggest that you do. You have been warned, read at your own risk. This is geared for mature audiences only.
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Bookmark Notes:
dude... im not even tryna read this... but the SHEER amount of tags... oh god the tags... how does one even THINK of all these... ... i need to put it in my schedule to read all these because WTF BRO
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Summary
A day has passed since Tenna settled into life with Mettaton- watched and appreciated, he's very hesitantly happy with this new, shaky life.
That is, until two certain kids get a little too curious, making the Knight have to set an example- or, perhaps, cause a distraction?
Originally a supposed murder attempt, Tenna can now walk around in the Light World, able to switch between ordinary TV and monster. Now he has to actually put the work into acting like a person, sorting through his trauma, and getting to know his new roommate. When characters from his past start making things more complicated, will he be able to handle the pressure? Or will he shatter for a third time?
- Language:
- English
- Words:
- 166,234
- Chapters:
- 25/?
- Comments:
- 1,802
- Kudos:
- 1,637
- Bookmarks:
- 248
- Hits:
- 37,397
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Summary
You were brilliant. A genius, a prodigy - a doctor at the age of twenty-two. Your soul is warm and kind, and you strive to help others despite your lingering demons. But, your success doesn't always have a good side to it.
When you accept a sick child and their monster parents at the hospital you worked at, you are met with more acceptance, love, kindness, and gratitude than any other human you had ever met. You eventually learn that the legend of Mt. Ebbot runs much deeper than what it had seemed on the surface.
- Language:
- English
- Words:
- 126,430
- Chapters:
- 36/?
- Collections:
- 1
- Comments:
- 1,567
- Kudos:
- 2,121
- Bookmarks:
- 282
- Hits:
- 41,278
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Bookmark Notes:
To read and fave
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Bookmark Tags:
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Summary
Chara awakens in a field of flowers deep in the Ruins. Weren't they supposed to be dead? Instead they form a tenuous alliance with a human invader, promising to help them through the Underground if they will shatter the barrier. So begins a tale of an unlikely partnership and an even unlikelier friendship.
(BONUS! Annotations chapter after the story!)
Series
- Part 1 of If We Fall Down
- Language:
- English
- Words:
- 169,698
- Chapters:
- 23/23
- Collections:
- 5
- Comments:
- 399
- Kudos:
- 960
- Bookmarks:
- 163
- Hits:
- 30,172
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Bookmark Notes:
Incredibly in character!! Love this
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Mutually Assured Seduction by d_bow
Fandom: Deltarune (Video Game), Undertale (Video Game)
08 Sep 2025
- Words:
- 20,125
- Works:
- 2
- Bookmarks:
- 8
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Bookmark Notes:
2 works, 1 one shot and 1 3/7 (ch count definitely didnt go up from 5 I didn’t see NOTHIN) (they are having kinky robot sex and Mettaton is trying to coax Tenna into a loving relationship by saying pspsps)
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CotLtale by Nekozaburo
Fandoms: Undertale (Video Game), Sky: Children of the Light (Video Game)
11 Apr 2023
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Summary
(Undertale and Sky: CotL crossover AU)
*Eye of Eden, all sky kids must go through it once in their life.
*But something went terribly wrong.
*Sky kids weren't returning from Eden, and no new children fell from the stars.
*No one wanted to believe it, but it must be true.
*Megabird had died.
*Years passed.
*Eden suddenly erupted.
*Raining down parts of its corrupted world, sky kids scrambled to get rid of it before they spread.
*But, they weren't enough of them to get rid of the corruption, and it spread more and more.
*Now, sky kids have lost their light.
*With no reincarnation or new life, there was no point to fight against the darkness.
*Decades later...
*A kid found themselves on the top of Eden, and fell down a hole...-
Bookmark Notes:
R: 15 O: 15
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Bookmark Notes:
SKY COTL AND UNDERTALE ULTIMATE CROSSOVER!!!!!
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We're Not Weird, We're Eccentric by TimeCloneMike
Fandom: Undertale, Undertale (Video Game)
15 Sep 2025
Summary
An Undertale Post-True Pacifist Series taking place in and around the small town of Ebott's Wake, at the foot of Mt. Ebott in scenic Lost Eagle County, Oregon. A place where monsters emerging from a mountain is NOT the strangest thing that has happened.
Matter of fact, it doesn't even make the top ten.
- Words:
- 1,228,888
- Works:
- 3
- Bookmarks:
- 207
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Bookmark Notes:
✨
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Summary
It's been 10 years since you've started anew. And now... it's time for you to start another new.
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Bookmark Notes:
If you appreciate undertale and the memories it gave you this definitely does it justice. Definitely cried during it ngl
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Summary
You were finally getting your life back on track. Juggling college courses and a new job, you were slowly but surely rebuilding from the ground up, convinced the worst was behind you. That all changes when a magical summons you can't refuse rips you from your world and drops you into a house filled with powerful, skeletal monsters who despise you before you’ve even said a word.
To them, you are the arrogant and careless human who shattered the soul of their dearest friend, the gentle mage Lyra. They see you not as a person, but as a living tool—a magical "key" they require to heal the damage you supposedly caused. Trapped in a multiversal nexus with no way home, you must navigate a gauntlet of relentless animosity and suspicion.
Every word you say is twisted, every action is judged through the lens of lies you don't even know have been told. How can you survive in a home that isn't a home, surrounded by enemies who believe they are the heroes? And how can you prove your innocence when the true manipulator is the very person they've sworn to protect?
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Summary
Two souls in the Underground, intertwined by fate and by a prophecy that keeps them apart.
Heads up before you read:
In this fic, Chara is alive and far from a good person. They’re not a mindless killer, but a narcissistic kid. This is not a fluffy Charisk story. Chara and Frisk’s relationship is deeply toxic.Please look at the tags before you continue.
I've been experimenting with third person for a while now, and I've grown to like it a lot more than first person. For those who came from my other fic, which I promised a sequel for, I’ll try my best, but I’m not sure how that will go now that I’ve fallen in love with third person and started a new long fic. Please don’t be angry I will try to finish my other fic as well.
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Summary
Mages are pretty much an endangered species in modern times, and those who exist prefer hierarchy within their magical classes.
The classes range from D-Rank, such as those with the ability to walk on walls or speak to nature, all the way to the very rare S-Rank, which consists of only WMD's- those who could use their powers to be Weapons of Mass Destruction.
S-class mages are often fought over within the clans and a general rule of thumb-- The more colors a person's soul is born with, the stronger the chance of them having magical potential, and a stronger type of power. In the magical community, S-Ranks are preferred to be under a group of some kind, and not wandering with free reign.
In the vast amount of multi-verses, what if there was alternate versions of one woman who owned a multi-aurae soul and held S-Rank status, but held no allegiance to any guild... And was also connected to the Savior of Monsters?
- Words:
- 162,007
- Works:
- 2
- Bookmarks:
- 21
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Bookmark Notes:
read later
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Hopeful Determination Short Stories by Seiji_The_Ice_Drake
Fandom: Undertale (Video Game)
25 Mar 2021
Summary
A series of Short Stories that take place before, during or after the events of HOPEFUL DETERMINATION.
Stories from either life in the underground before or after Chara fell. Stories about what certain characters were doing while Frisk and Chara marched along the underground. Stories about life on the surface.
Maybe even some stories that give a small depiction of what this scenario would be like in another universe, or maybe if the two took a different approach while traversing the underground.
- Words:
- 55,819
- Works:
- 6
- Bookmarks:
- 9
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BRINGING DAWN - An Undertale and Fire Emblem: Three Houses crossover by Hello_I_Exist
Fandoms: Fire Emblem: Fuukasetsugetsu | Fire Emblem: Three Houses, Undertale (Video Game)
05 Aug 2025
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Summary
Instead of fleeing to Remire village after Kostas attacks their 'Bonding camping trip,' our three favorite lords make their way to the foot of Mt. Ebott- a small mountain in the aptly named 'Ebott' region.
Things, predictably, do not go to plan, and in the process of their escape attempt, the trio find their way into a familiar cave with a familiar hole in the ground.
Faced with a whole new world of Monsters and Souls, Edelgard, Dimitri, and Claude must find a way back to the surface they call home... But things won't be quite that simple.
A murderous and manipulative flower, a barrier sealing a whole race underground, and a mysterious voice calling for consequences to be done- Yet despite everything, so long as they hold the strength to continue, nothing shall stand in their way.
...Right?
*Greetings.
(No Undertale knowledge is required in order to read this fic)
{v2.16 Update: ON HIATUS.}
Series
- Part 2 of Bringing Dawn
- Language:
- English
- Words:
- 46,179
- Chapters:
- 16/66
- Collections:
- 2
- Comments:
- 224
- Kudos:
- 117
- Bookmarks:
- 34
- Hits:
- 6,302
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Bookmark Notes:
Chapter 15 - Post-Ruins
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Bookmark Notes:
Ch 15
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Summary
Eight years have passed since the barrier broke, and Frisk is now in high school, dealing with all the struggles that come with that, aided by the love and support of their monster family. Through the Bad Times and the Good Times, what's important is that they all stick together.
EDIT: 1/26/2016
Initially, this was going to be a bunch of one-shots. Somewhere along the line, it's evolved into something more. If you like ridiculous amounts of fluff, subplots, generous helpings of character development, and some fantastic jokes, click that title and enjoy the ride!- Language:
- English
- Words:
- 115,923
- Chapters:
- 35/35
- Collections:
- 1
- Comments:
- 1,666
- Kudos:
- 3,571
- Bookmarks:
- 486
- Hits:
- 76,109
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Bookmark Notes:
Read at some point
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Summary
Tenna considers himself to be a seasoned family entertainer, a jack of all trades in the high-flying business of distraction. He knows what makes children laugh and mothers smile.
His new home has no children or parents. It’s barely a home at all, only a tiny room with an audience of one who is neither mother, father, nor child.
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Summary
It's been three years since you fell into the underground and found a family among the monsters of the Ruins. You love your life here with Mom, your ghost buddy Blooky, your prickly friend Flowey, and the host of Ruins monsters who have accepted you as their own, but things can't stay this way forever. Your friends deserve to see the sun, and there's a prophecy to be fulfilled and a barrier to be broken. Your determination pulls you onward.
The only trouble is that you'll have to make it through an underground full of monsters clamoring after the red SOUL in your chest, and each day as circumstances become more dire they lose a little more hope. This is a more desperate underground than the one you landed in. The odds don't look good for one pacifist child with a stick.
Of course, you aren't completely outmatched. You've spent the last three years training for this moment, and you don't intend to let anyone hit you.
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Bookmark Notes:
Frisk trains in the Ruins before facing the rest of the Underground
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Summary
You, a lazy, jobless young adult who was still bumming in their parent's house, woke up in a bed of golden flowers.
That scenario was oddly familiar to you, and the reason for that became apparent when one of those flowers greeted you with an overly enthusiastic "Howdy!"
Next thing you know, you see your SOUL, and you are made painfully aware that you are destined to die, because it wasn't red.A generic Reader-insert fandom-metta Undertale fanfiction piece.
#NaNoWriMo2017
Series
- Part 1 of Welcome To An Undertale Isekai
- Language:
- English
- Words:
- 102,587
- Chapters:
- 55/55
- Collections:
- 4
- Comments:
- 1,784
- Kudos:
- 2,783
- Bookmarks:
- 502
- Hits:
- 54,218
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Bookmark Collections:
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