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undertale fic/au ideas !!! by silverstormsxx
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
07 Sep 2025
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every one is free to use as long as you credit me :D
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AU: OUTERFROSTSHIFT (Boy, that's a mouthful..)
Alt name: Frozen Stars
Combines elements of Outertale, Storyshift (or my version of it anyway) and some.. other things---
Metta's story!
- Language:
- English
- Words:
- 1,638
- Chapters:
- 2/2
- Hits:
- 0
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Long live the Monarch! by urmom_friskas for Alexandra_green
Fandoms: Undertale (Video Game)
07 Sep 2025
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After King Asgore’s death, the Underground was left leaderless. Gravely injured from her fight with the human, Undyne was in no condition to rule, so Mettaton stepped in to take her place until she could recover. However, after some time he vanished, forcing the monsters to search for a monarch once more. Then, quite unexpectedly, Alphys proposed a candidate…
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The Shadow in the Knight’s Hand by Metal_Overlord93
Fandoms: Undertale (Video Game), Deltarune (Video Game)
07 Sep 2025
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In the quiet town of Hometown, everything seems peaceful… or so it appears.
Kris Dreemurr, a lonely teenager haunted by a past tragedy, struggles to find their place. With their brother, Asriel away at college and their best friend Noelle growing distant, Kris feels more isolated than ever. But along the way, they form new friendships, and slowly begin to reconnect with Noelle.
Meanwhile, whispers spread of a mysterious figure appearing around town, a cat-like shape with haunting pink and yellow eyes. Some say it appeared after the disappearance of December “Dess” Holiday.
Now, with strange “Dark Fountains” opening across the land, Kris and their friends must uncover the truth behind Dess’s vanishing and confront the darkness threatening to consume their world.
Series
- Part 1 of UT/DR stuff
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UDY on the Surface by CommanderBullet
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
07 Sep 2025
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It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-life crossover AU.
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UnderTime by WalrusSilverfish
Fandoms: UnderTime (by WalrusSilverfish), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
07 Sep 2025
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Undertale/Deltarune Headcanons by Nightshade_The_Tabaxi
Fandoms: Undertale (Video Game), Deltarune (Video Game)
05 Sep 2025
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Unwilling to kill to claim a soul—or to strike down the monster king to escape—Frisk chooses to stay underground. The monsters crown her their princess, and she grows up among them, a symbol of hope and peace.
But shadows from the past refuse to stay buried.
When the fragile peace begins to crack, Frisk must face what she's tried to forget. Alongside her childhood friend, Sans, she sets out to protect the only home she's ever known—and the people she loves—from a threat that spans timelines.
With original art. Inspired by Seventh Soul by 8TheKat
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Worth A [Shot] by Grand_Spurinko
Fandoms: Deltarune (Video Game), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
05 Sep 2025
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Clover is torn between his duty and his chance at a better life.
Flowey must figure out why his RESET button isn't working.
Martlet, Ceroba, and Starlo have to figure out how to care for Clover.
Above all, Spamton G. Spamton must figure out how in the [All Expenses Paid Vacation] he got here... and maybe make some [Deals] along the way.
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Sick To Death (Of Me Chasing You) by CrossoverAU
Fandoms: Undertale (Video Game), Alice by Heart - Sheik/Sater/Sater & Nelson
04 Sep 2025
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Raine was sick. Really sick.
The kind of sick where, despite not knowing what she had, she knew she didn't have long left.
Her best friend Sans knew that too.
Not wanting her to live her last moments trapped in her house, Sans read her one of her favorite stories, Alice in Wonderland.
While chasing her through the pages, Sans learns that he loves her too much to let her die.
Will he be able to let her go or will he try to selfishly stop the clock?
Aka an Undertale/Alice By Heart crossover fic because I couldn't find one
Note: knowledge of Alice By Heart isn't needed to read this fic!
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Tenna’s made himself home at his new home, but there are cracks underneath his shining exterior.
Shorter Tenna character study to post while I continue to work on my longer fic that I have planned.
Series
- Part 5 of Deltarune Short Stories
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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?
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REBOOT (You've wandered out of bounds!) by HollowedVoid
Fandoms: Deltarune (Video Game), Undertale (Video Game)
02 Sep 2025
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Reboot of my original fic I made back in 2019!
After going into the woods to do their assignment, Kris, Susie, and Noelle find themselves falling into the underground. Kris, with the newfound autonomy that comes when the thing usually controlling you is busy with some kid and their ghost friend, needs to navigate how the trio is going to get back home, and how they can free themself from the clutches of the man that speaks in hands. Ghosts walk the underground, and a time looping 11 year old needs to have the "you can't keep killing and resetting everything, even if you can undo it again, stop listening to the voice in your head" talk.
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Ghost monsters don’t have daemons — that is, until they become corporeal.
Napstablook doesn’t know this, when they end up trapped in Mettaton’s dead body.
Neither does their daemon.
Series
- Part 1 of a different side of me
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Splatale by Demolotl
Fandoms: Undertale (Video Game), Splatoon (Manga), Splatoon (Video Games)
02 Sep 2025
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When I was but a child I played splatoon after watching one too many undertale comic dubs on YouTube and had an idea for fanfic before I really knew what it was, the idea mostly was “what if a inkling was in undertale instead of frisk?”
Sketch(splatoon oc) was really exited to join in on the splatfest happening this week it was in a new arena built on top of the now forgotten mt. Ebott sketch and his crew head into there first match things are going great until sketch falls of the map landing himself in the underground’s of undertale.
This isn’t that serious of a fanfic so please don’t expect a masterpiece as it is my first fic :3 please don’t hate me it’s written in 1st person
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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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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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Trash Heap by KeyKGaming
Fandoms: Undertale (Video Game), Deltarune (Video Game), Undertale Yellow is also in the canon
01 Sep 2025
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What happens when you get darker than dark?
Can you bring what you see in the black abyss into the light?
Spamton and Tenna are some of the strangest monsters in the underground, seeing as they don’t function like normal monsters. No one seems to understand what they are, not even themselves. The unlikely duo have made their home in the dump, always looking for answers and peace of mind with their own inner struggles.
I’ve seen a lot of Undertale AU versions of Tenna and Spamton, so I decided to take a crack at writing something for it!
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The dichotomy between black and white is your constant when it's time for you to meet the whole new civilization Frisk brought along with them to the Surface.
As a parent, it's not easy to trust others when they've hurt your child.
So when that new civilization decides they owe Frisk both for saving their kind and for still hurting them during that process, you've got plenty to say to them.
Forgive as easily as you once did with others during a stage of naivety? Oh, hell no.
They better have a good reason for hurting your child and an even better one for wanting to be a part of their family.
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Full Arc List:
Arc 1 | Ruins
Chapters 1 to 15 (✓ complete)
Arc 2 | Enemy Approaching
Chapters 16 to 25 (✓ complete)
Arc 3 | Pathetic House
Chapters 26 to 30 (× current)
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(Important Notice: If this work seems familiar, it was originally published in 2020, but was deleted due to various health issues!)
(OLD WRITING LASTS UNTIL CHAPTER 25.)
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Shattered Across Worlds by Jaynosurname
Fandoms: Deltarune (Video Game), Undertale (Video Game), Mother 3 (Video Game), OMORI (Video Game)
31 Aug 2025
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After Kris's attempt to create a dark world goes wrong. It sends the entirety of Hometown into the darkness and shatters Kris's soul into pieces. The pieces of the soul were separated into different worlds. Now Kris, Susie, and Ralsei must travel through different worlds to find the missing pieces and find their missing friends along the way.
Status: Ongoing
(Important Note! While other games will be featured in this fic, this is still primarily a Deltarune/Undertale fic. I wouldn't recommend reading this unless you are familiar with those games.)